Scattered exposures of Tertiary continental sedimentary rocks occur north of the Denali fault and consist of, from youngest to oldest, the Nenana Gravel, a sandstone unit, and the sedimentary rocks and coal of the Jarvis Creek coal field (Wahrhaftig and Hickox, 1955).The Nenana Gravel occurs mainly in the northwestern corner of the quadrangle, and north of the Jarvis Creek coal field in the center of the quadrangle.The sandstone unit occurs mainly in fault-bounded prisms along the northern edge of the Alaska Range.The Jarvis Creek coal field occurs between the Delta River and Jarvis Creek, east of the Richardson Highway. TnNenana Gravel (Pliocene) Consists chiefly of poorly cemented conglomerate but includes some sandstone and siltstone.Clast composition within the D-6 quadrangle of (in decreasing order of abundance) is schist, quartzite, granitic rocks, gabbro, and metagabbro.At one locality in the C-3 quadrangle, clasts approximately 80% schist, 10% quartz, and 10% felsic volcanic rocks, mafic volcanic rocks, and diabase.Bedding strikes northeast and dips gently south in the D-6 quadrangle; and strikes northwest and dips moderately to steeply north near contact with finegrained metasedimentary rocks of the Jarvis Creek Glacier terrane (unit jcs) along the Granite Mountain fault, in the northern C-3 quadrangle.Eroded at top.Maximum exposed stratigraphic thickness of a few hundred meters Mainly exposed along northern D-6 quadrangle boundary, northeastern C-4 quadrangle, and northeastern C-3 quadrangle.Unconformably overlies granite of Granite Mountain (grgm) and fine-grained metasedimentary rocks (jcs) of Jarvis Creek Glacier subterrane; locally in fault contact with Jarvis Creek Glacier terrane (unit jcs).Unconformably overlain by Pleistocene glacial deposits, and overlies coal-bearing sedimentary rocks of Jarvis Creek coal field (unit Tsju) inferred to be of early Tertiary age (Moffit, 1942; Wahrhaftig and Hickox, 1955), and locally Unconformably overlies the sandstone unit of Oligocene to Pliocene age (Ts).Inferred to be of late Tertiary (Pliocene) age.Lithologically similar to rocks assigned to Nenana.Gravel occur to west in the Mealy quadrangle; assigned a Miocene(?) and Pliocene age by (Csejtey and others, (1992)