Abstract
The tract of land embraced in the area from which the fossils have been derived, that form the subject of the present Memoir, extends in an easterly direction from Saltcoats to Newmilns, a distance of about 19 miles. At both extremities, the Coal Measures narrow down to under half a mile wide at Saltcoats, and about a mile broad at Newmilns. The greatest width is found towards the centre of the field, where in a northeast and south-west direction it is over 12 miles broad.

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