[2] The name Cornbrash is an old English agricultural name applied in Wiltshire to a variety of loose rubble or brash which, in that part of the country, forms a good soil for growing corn.

The name was adopted by William Smith for a thin band of shelly limestone which, in the south of England, breaks up in the manner indicated.

In the inland exposures in Yorkshire it is difficult to follow on account of its thinness, and the fact that it passes up into dark shales in many places the so-called clays of the Cornbrash, with Avicula echinata.

Good localities for fossils are Radipole near Weymouth, Closworth, Wincanton, Trowbridge, Cirencester, Witney, Peterborough and Sudbrook Park near Lincoln.

A few of the important fossils are: Waldheimia lagenalis, Pecten levis, Avicula echinata, Ostrea fiabelloides, Mycicites decurtatus, Echinobrissus clunicularis.