49 
meridge clay is seen in several places : it is uniformly a black 
sbaley clay, in wliicb flattened Ammonites were found, but the 
species could not be determined. There can be little doubt 
as to its age. 
The Red chalk is also well exposed, and one section (now 
hidden) gave a thickness of six feet eight inches. The true 
thickness may exceed this. The rock, especially in the upper 
four feet, is of a hard, rubblj^ or nodular character, a red clay 
occurring at the base. The fossils found were the common 
Belemnites minimus and Terehrafula seniiglohosa. 
There is little that calls for special notice in the grey chalk 
and lower chalk. 8eams of fullers earth are found in them, 
separating the beds, and the joint surfaces of the chalk are 
frequently coated with a black deposit of manganese. 
There are two special beds now to be noticed in the white 
chalk. A zone of pink chalk, some thirty feet from the top of 
the red chalk, in thickness about 1 foot; and at twenty-flve feet 
higher, there is a remarkable bed of an argillaceous and car¬ 
bonaceous character, the central part being black and coaly, and 
yielding fragments of plants. The upper and lower divisions of 
this zone are laminated and jointed marls of pale yellow, 
greenish and brown colour, much of it being fullers earth. 
It is devoid of fossils. The total thickness of this series is 
about three feet. 
Having now finished the description of the sections, there 
remains the question of the relations of these rocks to the 
neighbouring type in North Yorkshire and Lincolnshire. 
Of late many geologists seem disposed to refer the South 
Yorkshire jurassic to the Lincolnshire type. This is supported 
by the absence of the great Yorkshire sandstones; but, on the 
other hand, the best marked rocks—the Millepore and Kelloway 
groups—agree well with the Yorkshire types, both in rocks and 
fossils. Nor do I see the necessity of referring them exactly 
to either type. They occupy an intermediate position, and 
may well be intermediate in character, for there is no doubt 
they were all formed as one continuous deposit. 
In the sections here exposed I have not found a greater 
affinity to the Lincolnshire than to the Yorkshire type of 
jurassic rocks. 
