On the Speeton Clay

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Abstract
I. I ntroduction . I n the attempt to study the Neocomian formation as developed in this country, my attention has been directed for some years past to the series of beds in Yorkshire which since 1829 has been known as “the Speeton Clay.” I have found that, although a very great variety of opinions had been expressed concerning the age of this formation, but little had been done towards working out in detail the true succession of the beds which compose it; and, as this part of the Yorkshire coast-section is greatly complicated by faults and contortions, and much obscured by landslips and drift, I soon became convinced that it was only by such detailed and systematic examination that satisfactory conclusions were to be arrived at. The fact that the mining operations now pursued on an extensive scale at these cliffs are rendering this unique section every year more and more obscure acted as a further incentive; and I accordingly determined on the execution of the following tasks:— 1. A careful survey of the Speeton Cliffs, and the construction of a map and section upon a very large scale, showing the various landslips &c., with a view to arriving at the true succession of the beds. The necessary basis for this work was opportunely furnished by the publication in 1862 of the beautiful 6-inch Ordnance Map of this part of the Yorkshire coast. 2. The collection of the fossils and drawing up accurate lists of the contents of the several beds.
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