« FW Geoarchaeologists Help Map San Francisco Bay Area Prehistory

Core22

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Recently opened core exposing artificial fill at the surface (~1.5–2.4 meters below surface), underlain by recent alluvium (~2.5–3.5 meters below surface), and followed in turn by a dense prehistoric shell midden (~3.5–5.5 meters below surface) formed on a Pleistocene-age sand dune (starting ~5.5 meters below surface).

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