Unpublished diagram, 'Boring shewing depth at which human remains were found' by Richard Owen A diagram showing the layers of the earth at Tilbury Docks, Essex [England], where Pleistocene (Paleolithic) human remains were excavated. The layers of the earth include clay, mud, mud and peat, peat, mud, peat, mud, decayed wood and sand, and a layer of sand at the depth at which the remains were found. Subject: Bioarchaeology / Geology 1883