XLVI. Notes on the Age of the Limestones of South Devonshire.

The reasons which induced me to assume on zoological evidence, that the limestones of Southern Devon, between Dartmoor and the coast, would prove to be of the age of the old red sandstone, not having been placed on record in a separate form, Mr. Murchison has begged me to lay before the Society a distinct notice of my claim to having been the first to propose the classification recently put forth by Professor Sedgwick and himself; and in...