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The formations are grouped as follows:-
Precambrian, undifferentiated (P-C); the Lower Palaeozoic (L. PAL); the Devonian/Old Red Sandstone (ORS/D and DEV); the Lower Carboniferous (Dinantian) (LC or CL); the Namurian (NA and NA CULM); the Lower Westphalian (LWCM and WCM); the Upper Westphalian, the Stephanian plus the lowest Permian, grouped together as UCM.
The upper Cover consisting of U. Permian (Zechstein) and later formations is not shown at all, being assumed removed to display the Floor.
The scale of the map is the same as that of the Geological Survey's 10 miles to 1 inch Geological Map. The area coincides with that of a map entitled A Structure contour map of the surface of the buried pre-Permian rocks of England and Wales by Kent (1949) and an unpublished amended version, which was circulated privately in 1964.
In this text, as on the map, the letters shown above in brackets are used instead of the full geological terms. The reader is asked to study the Index for a fuller explanation, and to note that there an attempt has been made to assign a time-interval to each of the groups of formations distinguished by a colour, following The Phanerozoic time-scale (Harland et al. 1964, 260-62).
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This 250-word extract was created in the absence of an abstract.
