Deeper Than Expected: The Finding of a Remarkable Ancient Harbour at Gadir/Gades and an Exceptional Sedimentary Archive (Cádiz, Southern Spain)

Geoarchaeological cores were retrieved in the centre of the old “Bahía-Caleta” palaeochannel located between the Erytheia and Cotinusa islands in the former Cádiz archipelago, in present-day southern Spain. The unprecedented coring depth (~ 35–50 m) allowed us to identify the bottom of a Phoenician–Punic and Roman harbour. Located at 20–40 m b.s.l. in the sedimentary sequence, silty sand deposits reveal a deep semi-protected shelter with abundant ceramic and archaeobotanical findings. Based on these new results, the palaeotopography of the islands of Cádiz is reinterpreted, demonstrating the presence of a harbour accessible from the west and possibly from the east until (at least) the Roman period. This major discovery opens meaningful perspectives for archaeological, geomorphological and palaeoenvironmental research.