<p>The IMPACT workshop series was developed in direct support of the 2050 Framework for Scientific Ocean Drilling and its call to "communicate far-reaching scientific ocean drilling knowledge to the broader community." IMPACT's goal is to build relationships and collect information from an array of different voices. Collectively, the Scientific Ocean Drilling IMPACT workshop series strives to chart the future course of science communication and outreach for scientific ocean drilling.</p><p>The summer 2021 virtual workshops explored STEM education and science communication, engaging workshop participants as collaborators, while paying special attention to issues related to diversity and inclusion. The 2022 IMPACT in-person workshop<strong> </strong>built on and drew from the summer 2021 virtual workshops to move the community forward in its approach to broader impacts for scientific ocean drilling. The findings from the workshop series are helping to create a blueprint for a science communication strategy that is an integral part of implementation of the 2050 Framework for Scientific Ocean Drilling.</p><p>In this paper we present a set of strategies with actionable plans for the next 5 years and beyond, through the evolution of 5 “Big Idea” topics and 19 projects that resulted from group brainstorming. Each idea is being led by a community-based group, who have worked to identify possible funding streams, partners and desired outcomes. This grassroots approach gives strength to the proposed ideas, coming from the community and charting the course for the community going forward.</p>

New high-resolution bathymetric data from Atlantis Massif and surrounding seafloor (30°N, Mid-Atlantic Ridge) records avolcanic extension associated with the formation of the axial rift valley floor, following the tectonic truncation of an active corrugated oceanic detachment fault system. The truncated Atlantis detachment is tectonically uplifted by a high-angle valley-bounding normal fault, formed after westward migration of the ridge at ∼0.4 to 0.1 Ma. Detachment fault remnants, with preserved corrugations, lie within the present-day rift valley seafloor, and demonstrate that a ∼20 km ridge section in the immediate vicinity of the Atlantis Fracture zone has not recorded any recent volcanic activity. Avolcanic extension may thus occur locally at the slow-spreading Mid-Atlantic Ridge, albeit for limited periods of time (less than a few hundred thousand years). The new fault dissecting the detachment shows a throw of ∼2800 m, partly due to flexural uplift. Emplacement of the Lost City hydrothermal site occurred at a late stage post-dating the detachment truncation and avolcanic rift valley formation. From the inferred timing of the westward ridge axis shift we calculate uplift rates ≥ 7 mm/yr, possibly as high as 33 mm/yr, which are equivalent to or greater than the fastest vertical uplift rates of active normal faults measured to date on Earth (Gulf of Corinth). Geomorphologic observations also demonstrate that mass wasting efficiently reworks the seafloor topography. We obtain local incision and erosion rates ≥1-2 mm/yr locally, and as high as 4-8 mm/yr, depending on the assumed age for the rift bonding fault (0.4 vs. 0.1 Ma respectively). Our results suggest that (1) avolcanic extension may occur locally at the slow-spreading Mid-Atlantic Ridge, albeit for limited periods of time (less than a few 100s of kyrs), and (2) document that shifts in axial valley location related to the abrupt abandonment of detachment faults is a first-order process in the asymmetric accretion of slow-spread oceanic lithosphere.

Scientific ocean drilling is an exemplar of international, collaborative research, having provided foundational and transformative knowledge across a wide range of Earth science disciplines. With a legacy of extraordinary discoveries and a visionary new Science Framework to chart its path forward, ocean drilling will continue to provide critical insights into the interconnectedness of Earth systems and use those insights for the benefit of society.

High-resolution 2D seismic data from the western side of Dogger Bank (North Sea) has revealed that the glacigenic sediments of the Dogger Bank Formation record a complex history of sedimentation and penecontemporaneous, large-scale, ice-marginal to proglacial glacitectonism. The resulting complex assemblage of glacial landforms and sediments record the interplay between two separate ice masses revealing that Late Devensian ice sheet dynamics across Dogger Bank were far more complex than previously thought, involving the North Sea lobe of the British and Irish Ice Sheet, advancing from the west, interacting with the Dogger Bank lobe which expanded from the north. The active northward retreat of the Dogger Bank lobe resulted in the development of a complex assemblage of arcuate thrust-blockmoraines (<= 15 km wide, > 30 km long) composed of highly folded and thrust sediments, separated by sedimentary basins and meltwater channels filled by outwash. The impact of the North Sea lobe was restricted to the western margin of Dogger Bank and led to deep-seated (100-150 m thick) glacitectonism in response to ice-push from the west. During the earlier expansion of the North Sea lobe, this thrust and fold complex initially occupied a frontal marginal position changing to a more lateral ice-marginal position as the ice sheet continued to expand to the south. The complex structural relationships between the two glacitectonic complexes indicates that these ice masses interacted along the western side of Dogger Bank, with the inundation of this area by ice probably occurring during the last glaciation when the ice sheets attained their maximum extents. (c) 2021 BGS/UKRI. Published by The Geologists' Association on behalf of Elsevier Ltd. All rights reserved.

Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, gamma radiation, velocity, density, borehole images,…) in any hole depends on the scientific objectives and operational constraints.

Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, gamma radiation, velocity, density, borehole images,…) in any hole depends on the scientific objectives and operational constraints.

Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, gamma radiation, velocity, density, borehole images,…) in any hole depends on the scientific objectives and operational constraints.

There aren’t many circumstances that require looking into the future to decide what people will be interested in about the past, while writing in the present. Dr. Roz Coggan wasn’t kidding when she drew a picture of a scientific ocean drilling vessel and labelled it as a Time Machine! So how do we go about communicating the science in the sediments, the cliff-hangers in the cores?Since 1966, the scientific community has looked to the oceans, and the natural laboratories hidden beneath them, to answer fundamental questions concerning the composition, structure, and key processes of the Earth, unravelling geochemical, biological, physical, structural, climatic and geohazard-related complexities along the way. As the current phase of scientific ocean drilling (IODP) is drawing to an end, an international team has drafted a new vision for the future of this inspiring and unique program, released officially in Fall 2020.The 2050 Science Framework for Scientific Ocean Drilling consists of seven Strategic Objectives and five Flagship Initiatives. Spanning all of these are four Enabling Elements - key facets that facilitate research activities, enhance outputs, and maximise their impact. Enabling Element 1 covers the broader impacts and outreach associated with scientific ocean drilling, including highlighting the societal relevance of its research topics, inspiring and training the next generation of ocean scientists, addressing knowledge sharing and collaborations, and working towards greater diversity and inclusion in geoscience. These are not small issues to address, and overall Enabling Element 1 sets an aspirational target for science communication going forward:“Using a variety of social media and web-based platforms, data and results will be broadly disseminated to educators, policymakers, and the public, securing scientific ocean drilling’s position as the authoritative source of information about the Earth system.” (Koppers and Coggon, 2020)We believe that with such broad aims, now is the time to formulate large-scale strategies for science communication. By bringing in aspects of strategy and branding, stirred together with a good dose of umbrella narratives, we aim to develop a transmedia approach to science communication, taking different present audiences on unique journeys into the past with an eye on the future. We will need to assess framing and relevance, the power of storytelling to communicate facts, and how best to ensure that our activities contribute to excitement about learning the unfolding stories of the Earth. Now is the perfect time to initiate this effort, and it is hoped that this review of multiple aspects of Science Communication, Public Engagement and branding can help begin these discussions.“What is it that we human beings ultimately depend on? We depend on our words. We are suspended in language. Our task is to communicate experience and ideas to others”. Niels BohrOriginal illustration by GeoProse from the 2050 From Koppers, A.A.P., and R. Coggon, eds. 2020. Exploring Earth by Scientific Ocean Drilling: 2050 Framework.

Many lakes undergo anthropogenically driven eutrophication and pollution leading to decreased water and sediment quality. These effects can enhance seasonally changing lake redox conditions that may concentrate potentially toxic elements. Here we report the results of a multi-method geochemical and sediment microfabric analysis applied to reconstruct the history of cultural eutrophication and pollution of the North and South Basins of Windermere, UK. Eutrophication developed from the mid-19th to the earliest 20th centuries. Enhanced lake productivity is indicated by increased sedimentary δ13C, and increased pollution by a higher concentration of metals (Pb, Hg, and As) in the sediment, likely enhanced by incorporation and adsorption to settling diatom aggregates, preserved as sedimentary laminae. In the South Basin, increasing sediment δ15N values occur in step with Zn, Hg, and Cu, linking metal enrichment to isotopically heavy nitrate (N) from anthropogenic sources. From around 1930, decreases in Mn and Fe-rich laminae indicate reduced deep-water ventilation, whereas periods of sediment anoxia increased, being most severe in the deeper North Basin. Strongly reducing sediment conditions promoted Fe and Mn reduction and Pb-bearing barite formation, hitherto only described from toxic mine wastes and contaminated soils. From 1980 there was an increase in indicators of bottom water oxygenation, although not to before 1930. But in the South Basin, the continued impacts of sewage are indicated by elevated sediment δ15N. Imaging and X-ray microanalysis using scanning electron microscopy has shown seasonal-scale redox mineralisation of Mn, Fe, and Ba related to intermittent sediment anoxia. Elevated concentrations of these metals and As also occur in the surficial sediment and provide evidence for dynamic redox mobilisation of potentially toxic elements to the lake water. Concentrations of As (up to 80 ppm), exceed international Sediment Quality Standards. This process may become more prevalent in the future with climate change driving lengthened summer stratification.

Coastal landforms such as barriers are crucial in protecting coastlines and reducing the rate of erosion and retreat. Sea-level rise threatens to change the baseline in which such landforms exist, therefore changing sediment fluxes and hydrodynamics at coastlines. Understanding the stability of landforms under changing conditions is crucial to protect and mitigate against the influence of future sea-level rise on coastal infrastructure, ecology and populations. By studying past periods of sea-level rise with rates similar to those projected for the future, we can begin to understand how coastlines may evolve over the next few centuries. Dogger Bank, in the southern North Sea, experienced marine transgression during the Early Holocene. Over a period of 800 years, sea level rose by 7-8 m. This rate of ~10 mm/yr is similar to that projected within the next century. Our study area is located on the southeastern side of the former Dogger Bank island. Between 9.5 and 8.7 ka BP, two phases of coastal barriers were present, retreating with different mechanisms at different time periods due to antecedent topographic changes and evolving hydrodynamics. Barrier phase A was drowned in place due to a low-angle topography and little reworking of the barrier. Barrier phase B retreated by continuous overstepping, which occurred due to a higher-angle topography and an increase in wave energy. Complete inundation of the study area occurred by 8.7 ka, with the barrier phase B first becoming an isolated barrier, then breaking down completely. The subsequent wave ravinement transitioned the landform from barrier to offshore sand bar. At this time, the rate of sea-level rise had increased to as much as 20 mm/yr during the pre-8.2 ka sea-level jump, causing the final barrier breakdown and inundation of Dogger Bank. The coastal morphology in the study area is now buried beneath up to 20 m of shallow marine sand, deposited as the dominant tidal current transported sediment from west to east. The unique landform preservation at Dogger Bank allows unprecedented spatial and temporal resolution into the investigation of coastal response to sea-level rise. This study adds evidence to the growing body of work that sea-level rise is the driver of, but not necessarily the controlling factor in, barrier retreat mechanism. Furthermore, a rarely-preserved landform, the isolated barrier, is presented. The results of the study provide valuable insights into the transition from coastal to fully marine during transgression of low-relief coastal areas, which provides an analogue for future sea-level rise scenarios.

Many lakes in industrialised areas have undergone anthropogenically driven eutrophication and increases in pollution leading to decreased water and sediment quality. In some cases, these effects are enhanced by seasonally changing lake redox conditions that may act to concentrate potentially toxic elements sufficiently to exceed internationally recognised Sediment Quality Standards, impacting key species and jeopardizing water supply. A combined, geochemical and sediment microfabric analysis is applied to reconstruct the history of cultural eutrophication and pollution in the North and South Basins of Windermere, England’s largest natural lake. We also document a record of seismicity and link increased sedimentation rates and sediment instability. The onset and development of eutrophication in Windermere occurred from the mid-19th to the early 20th centuries. Raised lake productivity is indicated by an increase in sedimentary δ13C, and increased pollution by elevated sedimentary trace metals (Pb, Zn, Cu, Hg, and As), likely enhanced by incorporation and adsorption to settling diatom aggregates, preserved as sedimentary laminae. In the South Basin of the lake, contemporaneous increasing sediment δ15N values also occur in step with increasing Zn, Hg, Cu from this time, linking metal enrichment to the input of isotopically heavy nitrate (N) from anthropogenic sources including sewage. From around 1930, a decrease in Mn and Fe-rich laminae indicate reduced deep water ventilation, and increased incidence of sediment anoxia, being most intense in the deeper North Basin where benthic activity intermittently ceased. Strongly reducing conditions in the sediment promoted Fe and Mn reduction and the formation of unusual Pb-bearing barite, hitherto only described from toxic mine wastes and contaminated soils. In the North Basin cores a clay rich laminae dated 1979-1980 is shown to be a mass transport deposit linked to large scale slope failure likely caused by the 4.7 ML 1979 Carlisle earthquake. Slope failure was exacerbated by preconditioning principally by increased sedimentation as a result of anthropogenic activities. From 1980 there was a partial recovery in oxygenation with Mn and Fe rich laminae returning in some parts. But in the South Basin, the continued impacts of sewage discharge is indicated by elevated δ15N of organic matter. Imaging and X-ray microanalysis using scanning electron microscopy has enabled the identification of seasonal-scale redox mineralisation of Mn, Fe and Ba related to intermittent sediment anoxia. Elevated concentrations of Mn, Fe, Ba, and As also occur in the surficial sediment and provide evidence for dynamic redox mobilisation of potentially toxic elements that may be released to the lake waters. Concentrations of As, in particular, exceed international Sediment Quality Standards. These surface enrichments in As and other toxic elements may become more prevalent in the future with climate change driving lengthened summer stratification in the lake.

High‐resolution shallow sub‐bottom seismic survey data obtained for the Dudgeon windfarm site located 50 km offshore of the north Norfolk coast in the southern North Sea have revealed that the chalk bedrock in this area is overlain by sediments deposited during the Elsterian and Weichselian glacial periods. A buried N–S‐trending subglacial drainage channel (tunnel valley) filled with Swarte Bank Formation (MIS 12) sediments indicates that the maximum extent of the Elsterian ice‐sheet margin occurred further to the south. Detailed cross‐sections constructed from the seismic data reveal the presence of buried thrust‐block moraine system composed of deformed (folded and thrusted) Swarte Bank Formation sediments, lying beneath a younger sequence of sediments dominated by the glacigenic Bolders Bank Formation (MIS 2). The geometry of the folds and sense of offset on the thrusts, coupled with the morphology of the ridge‐like landforms within this buried moraine system, are consistent with deformation having occurred in response to ice‐push from the N/NE. The chalk bedrock that underlies the glaciotectonized sequence is thought to have provided an antecedent control on the location and preservation of this moraine system. A three‐phase model is proposed to explain the evolution of this thrust‐moraine complex that formed at the oscillating ice margin during the overall active retreat of the Elsterian ice sheet.

Current models that project sea-level rise beyond 2100 have large uncertainties because recent observation encompass a too limited range of climate variability to provide robust tests against which to simulate future changes. It is crucial to turn to the geological record where there are large-scale changes in climate, but the current interglacial provides limited evidence for how the Earth-system responds to increased temperatures, and therefore it is necessary to study previous climatically-warm periods. Global temperatures during the Last Interglacial were ~1oC warmer than pre-industrial values and 3-5oC warmer at polar latitudes, during which time global mean sea level was likely 6-9 m above present. Though the drivers of warming during the Last Interglacial are different to those of today, it is the amplified warming at polar latitudes, the primary locations of the terrestrial ice masses likely to contribute to long term sea-level rise, which makes the Last Interglacial an ideal palaeo-laboratory to understand coastal response to sea-level rise. However, our understanding of Last Interglacial sea level change is primarily limited to tropical and sub-tropical latitudes and it is important to understand the response of temperate estuarine settings to rising sea level. The ERC-funded RISeR project (Rates of Interglacial Sea-level Change, and Responses) focuses on specifically targeting palaeo shorelines buried within the southern North Sea, preserved beyond the limit of the Last Glacial Maximum ice sheets. Buried Last Interglacial sequences in this area provide a valuable record of marine transgression and are being unveiled in new geophysical and geotechnical datasets acquired to support the offshore renewable energy development. This offshore sedimentary archives offer significant advantages over the geomorphologically restricted onshore records allowing us to trace the transgression over a much large area, and should capture the earliest flooding of the Last Interglacial North Sea basin, when the far-field data suggests ice sheet melt was at it maximum. By integrating the already available datasets with newly acquired samples as part of the project, we aim to develop new palaeoenvironmental reconstructions of the Last Interglacial sea-level change from northwest Europe, providing the first chronological constraints on timing, and therefore rates. This has the potential to allow us to ‘fingerprint’ the source of melt (Greenland and/or Antarctica) during the interglacial sea-level highstand.

Submerged landscapes on continental shelves archive drainage networks formed during periods of sea-level lowstand. The evolution of these postglacial drainage networks also reveals how past climate changes affected the landscape. Ice-marginal and paraglacial drainage networks on low-relief topography are susceptible to reorganisation of water supply, forced by ice-marginal rearrangement, precipitation and temperature variations, and marine inundation. A rare geological archive of climate-driven landscape evolution during the transition from ice-marginal (ca. 23 ka) to a fully submerged marine environment (ca. 8 ka) is preserved at Dogger Bank, in the southern North Sea. In this study, our analysis of high-resolution seismic reflection and cone penetration test data reveal a channel network over a 1330 km2 area that incised glacial and proglacial lake-fill sediments. The channel network sits below coastal and shallow marine sediments and is therefore interpreted to represent a terrestrial drainage network. When mapped out, the channel form morphology reveals two distinct sets. The first set comprises two low-sinuosity, wide (>400 m) channels that contain macroforms of braid and side bars. These channels are interpreted to have originated as proglacial rivers, which drained the ice-sheet margin to the north. The second set of channels (75–200 m wide, with one larger, ∼400 m wide) has higher sinuosity and forms a subdendritic network of tributaries to the proglacial channels. The timing of channel formation lacks chronostratigraphic control. However, the proglacial rivers must have formed as the ice sheet was still on Dogger Bank, before 23 ka, to supply meltwater to the rivers. Ice-sheet retreat from Dogger Bank led to reorganisation of meltwater drainage and abandonment of the proglacial rivers. Palaeoclimate simulations show a cold and dry period at Dogger Bank between 23 and 17 ka. After 17 ka, precipitation increased, and drainage of precipitation formed the second set of channels. The second set of rivers remained active until marine transgression of Dogger Bank at ca. 8.5–8 ka. Overall, this study provides a detailed insight into the evolution of river networks across Dogger Bank and highlights the interplay between external (climate) and internal (local) forcings in drainage network evolution.

12 High resolution seismic data from the Dogger Bank in the central southern North Sea has revealed 13 that the Dogger Bank Formation records a complex history of sedimentation and 14 penecontemporaneous, large-scale, ice-marginal to proglacial glacitectonic deformation. These 15 processes led to the development of a large thrust-block moraine complex which is buried beneath a 16 thin sequence of Holocene sediments. This buried glacitectonic landsystem comprises a series of 17 elongate, arcuate moraine ridges (200 m up to > 15 km across; over 40-50 km long) separated by 18 low-lying ice marginal to proglacial sedimentary basins and/or meltwater channels, preserving the 19 shape of the margin of this former ice sheet. The moraines are composed of highly deformed (folded 20 and thrust) Dogger Bank Formation with the lower boundary of the deformed sequence (up to 40-50 21 m thick) being marked by a laterally extensive décollement. The ice-distal parts of the thrust 22 moraine complex are interpreted as a “forward” propagating imbricate thrust stack developed in 23 response to S/SE-directed ice-push. The more complex folding and thrusting within the more ice24 proximal parts of the thrust-block moraines record the accretion of thrust slices of highly deformed 25 sediment as the ice repeatedly reoccupied this ice marginal position. Consequently, the internal 26 structure of the Dogger Bank thrust-moraine complexes can be directly related to ice sheet 27 dynamics, recording the former positions of a highly dynamic, oscillating Weichselian ice sheet 28 margin as it retreated northwards at the end of the Last Glacial Maximum. 29

Annually laminated sediments (varves) provide excellent temporal resolution to study rapid environmental change, but are rare in the early part of the Last Termination (similar to 19-similar to 11.7 ka BP). We present a new >400 varve year (vyr) varve sequence in two floating parts from Windermere, a lake at the southern margin of the mountains of northwest England. This sequence records the final retreat of the Windermere glacier at the southern edge of the Lake District Ice Cap during the transition from Heinrich Stadial 1 (similar to 18-similar to 14.7 ka BP) into the Lateglacial Interstadial (similar to 14.7-similar to 12.9 ka BP). Laminated sediments from four lake cores from Windermere's northern and southern basins were investigated and shown to be varved. These sequences are integrated with seismic reflection evidence to reconstruct south-to-north deglaciation. Seismic and sedimentological evidence is consistent with gradual stepped ice retreat along the entire southern basin and into the northern basin between 255 and 700 vyr prior to the appearance of significant biota in the sediment that heralded the Lateglacial Interstadial, and had retreated past a recessional moraine (RM8) in the northern basin by 121 vyr prior to the interstadial. The Lateglacial interstadial age of this biota-bearing unit was confirmed by C-14-dating, including one date from the northernmost core of similar to 13.5 cal ka BP. A change in mineralogy in all four cores as the glacier retreated north of the Dent Group (the northernmost source of calcareous bedrock) and a decrease in coarse grains in the varves shows that the ice had retreated along the entire North Basin at similar to 70 vyr prior to the Lateglacial Interstadial. The estimated retreat rate is 70-114 m yr(-1) although buried De Geer moraines, if annual, may indicate retreat of 120 m yr(-1) with a >= 3 year stillstand at a recessional moraine halfway along the basin. The glacier then retreated north of the lake basin, becoming land-terminating and retreating at 92.5-49 m yr(-1). The northernmost core has a varve sequence ending at least 111 vyr after the other core chronologies, due to the increased proximity to remnant ice in the catchment uplands into the early Lateglacial Interstadial. We show that almost all of the glacier retreat in the Windermere catchment occurred before the abrupt warming at the onset of the Lateglacial Interstadial, in keeping with similar findings from around the Irish Sea Basin, and suggesting a similar retreat timescale for other radial valley glaciers of the Lake District Ice Cap. The seismic and core evidence also show the potential for a much longer varve chronology extending at least 400 and potentially over 1000 vyr further back into Heinrich Stadial 1 (18-14.7 ka BP), suggesting that glacier retreat in the Windermere valley initiated at least before 15.5 ka BP and perhaps 16 Ka BP. (C) 2019 The Authors. Published by Elsevier Ltd.

The southern North Sea is a particularly important area for understanding the behaviour of the British Irish Ice Sheet (BIIS) during the last glacial cycle. It preserves a record of the maximum extent of the eastern sector of the BIIS as well as evidence for multiple different ice flow phases and the dynamic reorganisation of the BIIS. However, to date, the known ice sheet history and geochronology of this region is predominantly derived from onshore geological evidence, and the offshore imprint and dynamic history of the last ice sheet remain largely unknown. Using new data collected by the BRITICE-CHRONO project this paper explores the origin and age of the Dogger Bank; re-assesses the extent and age of the glaciogenic deposits across the shallow areas of the North Sea between the Dogger Bank and the north Norfolk coast and; re-examines the dynamic behaviour of the BUS in the southern North Sea between 31.6 and 21.5 ka. This paper shows the core of the Dogger Bank to be composed glaciolacustrine sediment deposited between 31.6 and 25.8 ka. Following its formation the western end of the Dogger lake was overridden with ice reaching similar to 54 degrees N where the ice margin is co-incident with the southerly extent of subglacial tills previously mapped as Bolders Bank Fm. This initial ice override and retreat northwards back across the Dogger lake was complete by 23.1 ka, but resulted in widespread compressive glaciotectonism of the lake sediments and the formation of thrust moraine complexes. Along the northern edge of the bank moraines are on-lapped by later phase glaciolacustrine and marine sediments but do not show evidence of subsequent ice override. The shallow seafloor to the west and southwest of the Dogger Bank records several later phases of ice advance and retreat as the North Sea Lobe flowed between the Dogger Bank and the Yorkshire/Lincolnshire coasts and reached North Norfolk. New optically stimulated luminescence (OSL) ages from Garrett Hill on outwash limit the arrival of the BIIS on the Norfolk coast to 22.8-21.5 ka. Multiple till sheets and chains of moraines on the seafloor north of Norfolk mark dynamic oscillation of the North Sea Lobe margin as it retreated northwards. This pattern of behaviour is broadly synchronous with the terrestrial record of deposition of subglacial, glaciofluvial and glaciolacustrine sediments along the Yorkshire coast which relate to post Dimlington Stadial ice marginal oscillations after 21.5 ka. With respect to forcing mechanisms it is likely that during the early phases of the last glacial maximum (similar to 30-23ka) the interaction between the southern margin of the BIIS and the Dogger Lake was critical in influencing flow instability and rapid ice advance and retreat. However, during the latter part of the last glacial maximum (22-21 ka) late-phase ice advance in the southern North Sea became restricted to the western side of the Dogger Bank which was a substantial topographic feature by this time. This topographic confinement, in addition to decoupling of the BIIS and the Fennoscandian Ice Sheet (FIS) further north, enabled ice to reach the north Norfolk coast, overprinting the seabed with late-phase tills of the Bolders Bank Fm. (C) 2018 The Authors. Published by Elsevier Ltd.