Excerpt from The Geology of the South-West Part of Lincolnshire, With Parts of Leicestershire and Nottinghamshire: Explanation of Sheet 70
The area represented on Sheet 70 of the Geological Survey of England contains a considerable portion of the Jurassic escarpments of Lincolnshire and is not unfamiliar to general readers, inasmuch as the line of the Great Northern Railway runs through it for nearly 30 miles, passing by Grantham and Newark. The rocks embraced in it range from the Keuper Marls up to the Kimeridge Clay. Among these the Lincolnshire Limestone attains its greatest thickness and covers a considerable breadth of ground, while the Marlstone also is locally well developed but presents a remarkable inconstancy of thickness.
As the area is a continuation of that described in the Geological Survey Memoir on the "Geology of Rutland" (Sheet 64) by Professor Judd, wherein the characters and classification of the Jurassic Strata of the Midland districts, and their correlation with those to the south-west and north, were fully discussed, the reader is referred to that Memoir for general questions which it has not been deemed necessary to re-open here. The present Explanation is confined to a description of the rocks that occur within the limits of the Map.
The Glacial and Post-glacial deposits, which play so important a part in the geology of the area, are represented on a separate edition of the Map. As they were only briefly discussed in the Rutland Memoir, and as they here present features of special interest, they are described in some detail in the following pages, references being also made to their extension into neighbouring, districts.
Some features of economic importance are likewise enumerated. One of the most noticeable of these is the occurrence of no fewer than four distinct platforms of ironstone, two in the Lias, one in the Inferior Oolite, and one in the Great Oolite.
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