"48.1"^^ . . "Harwich Formation And Lambeth Group (Undifferentiated)"@en . . "Harwich Formation And Lambeth Group (Undifferentiated)"@en . "HWLM"@en . . "Sand with subsidiary clay, mudstone and sandstone. Bedrock. Occurs onshore. Formed during the Paleocene Epoch - to - Early Eocene (Palaeogene Period) (66-48.1 Ma BP)."@en . . "See the Lithology descriptions for the component units."@en . "66.0"^^ . "stable"@en . .