Geology of the Counties of England and of North and South Wales

Ammonites band Boulder Clay called Carboniferous chalk cliffs coal coal-field Coal-measures coal-seams coast containing coprolites corals Cornbrash Crag denudation deposits Devonian district Drift east eastwards England Eocene escarpment exposed fault feet in thickness feet thick flint Forest formation fossils Gault Geol Geological Survey geologists glacial granite gravel grey hard Hill inches iron Journ Keuper Kimmeridge Kimmeridge Clay land layers Lias lime London Clay maps marls mass Messrs miles Millstone Grit Mountain Limestone Museum Natural History nodules north-east north-west Northampton Sand numerous occur Old Red Sandstone Oolite outcrop Oxford Clay pebbles Permian Prof Professor quarried Reading Beds red marl Rhætic river round sand sandy seams sections seen shales shells Silurian Silurian rocks slates Society south-east south-west southwards species stone strata surface Tertiary thin tons total thickness traced Triassic valley Wales Whitaker Yorkshire