IV.—The Chemical Examination of the Carboniferous Limestones of the Avon Gorge

Extract

In view of the attention which has been drawn of recent years to the mode of origin of the purer limestones, I have been led to prosecụte some inquiries under this head on the Carboniferous Limestones of the Avon Gorge, near Bristol. I have paid greatest attention to the chemical composition of the rocks, particularly the proportion of insoluble residue remaining after treatment with hydrochloric acid; at the same time I have not wholly neglected the fossil contents, although for information on this point I have mainly relied on other observers.