the low lying London Clay marshlands along the Thames/Medway estuaries and along the North Kent coast;
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An Oligocene species, A. prisca, was published from the London Clays of England eight years earlier in 1926 by Chandler and Reid.
Commercially useful deposits of about 2m to 4m thick are present in Kent, Hertfordshire and Hampshire, overlying chalk, Thanet Beds or London Clay.
Eddington is approximately 13 metres above sea level, lying above mainly London Clay with some head Brickearth next to Plenty Brook; however to the east this changes to Tertiary deposits of the Thanet, Oldhaven and Woolwich beds.
Eothynnus salmonens is an extinct species of prehistoric jackfish that lived during the lower Eocene of what is now the Isle of Sheppey (as a part of the London Clay Lagerstatten.
The most important formations are the Cretaceous chalks, which are exposed as the high ground in the north and west of the county, and the Cenozoic rocks made up of the Paleocene age Reading beds and Eocene age London Clay that occupies the remaining southern part.
Underlying the town at some depth is the London Clay stratum, with a thick layer of Boulder clay laid down during the ice ages, including the Anglian.
Located on London Clay, it has many flowers typical of clay pasture, such as greater bird's-foot-trefoil and burnet-saxifrage.
It is often encountered as the heptahydrate sulfate mineral epsomite (MgSO4ยท7H2O), commonly called Epsom salt, taking its name from a bitter saline spring in Epsom in Surrey, England, where the salt was produced from the springs that arise where the porous chalk of the North Downs meets non-porous London clay.