and Middle Paleolithic. Beeches Pit is considered a site of special interest because not only were shells and plant remains found but animal bones that were burnt. The sites around Hitchin, Hertfordshire are associated with lakes caused by the melting of glaciers that settled in holes. When archaeologists dug up the sites they found dense soil full of gravel. The gravel is hypothesized to come from the creation of hand axes. At Marks Tey, Essex the lake soil was rich with pollen spanning all of the Hoxnian and remnants of gravel and artefacts. See also Ice age Glacial period Last glacial period Timeline of glaciation References Further reading External links Pleistocene Interglacials