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In page Plymouth:

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Upper Palaeolithic deposits, including bones of Homo sapiens have been found in local caves,[1] and artefacts dating from the Bronze Age to the Middle Iron Age have been found at Mount Batten,[2] showing that it was one of few principal trading ports of pre-Roman Britannia dominating continental trade with Armorica.[3] An unidentified settlement named TAMARI OSTIA (mouth/estuaries of the Tamar) is listed in Ptolemy's Geographia and is presumed to be located in the area of the modern city.[4] An ancient promontory fort was located at Rame Head at the mouth of Plymouth Sound[citation needed] with ancient hillforts located at Lyneham Warren to the east, Boringdon Camp[citation needed] and Maristow Camp to the north.[5]