NORMAN — UPPER GREENSAND OF ISLE OF WIGHT. 481 
1st. The upper portion of the section is subdivided into two parts, 
being in fact two distinct deposits, differing materially in mineral 
character, and almost distinctly in their organic remains ; for instance, 
the first division contains numerous species of Ammonites, amongst 
which the most conspicuous are A. varians, A. Mantelli, and^. Coupei 
in all its varieties, with numerous other shells that never occur in the 
Firestone below, or, indeed, in any other of the beds throughout 
the series, although they are met with in the chalk-marl above, 
to which it evidently ajiproximates, being of a much lighter colour 
than the beds below. It is termed the " Phosphatic marl." The organic 
remains are for the most part water- worn, and exist in the state of 
casts, especially the Ammonites, which are so numerous that, judging 
from the profusion of their remains, they must have literally swarmed 
in the sea of that period. 
2nd. At the bottom of the before-mentioned deposit, we come upon 
a bed of fantastically-shaped nodules, varying in size from a few inches 
in diameter to a foot, amongst which may be found the water- 
worn remains of a gigantic bivalve, termed " Radiolites," teeth and 
bones of Saurians, hook-shaped teeth, &c. 
Below this, again, is a thick bed of dark-green, soft sandstone, 
readily weathered. This bed I believe to have been named the 
" Chloritic marl," by geologists. At the bottom of it is another layer 
of nodules, similar in character to those above, containing also the teeth 
and bones of saurians as well as of sharks, with other fossils, the most 
characteristic being the Pecten orbicularis, which abounds. 
3rd. The next division consists of layers of siliceous sandstone and 
beds of rag, alternating with beds of coarse, brittle, flinty masses, or 
coarse chalcedony, locally termed " shotterwit," which is much used for 
the making and mending of roads, as is also the limestone or rag. It is 
very brittle, and easily broken into square fragments ; and is almost 
destitute of organic remains, but the large Peden quinque-coitatus is 
sometimes, though rarely, found ; but, being imbedded in a flinty 
matrix, it is seldom extracted whole. The same shell also ranges through 
the four alternate layers of rag and chert, but the writer has met with 
no other fossil remains, except coniferous wood. 
4th. The next beds in descending order consist of hard, brittle 
stone, spongy in texture, and strongly impregnated with silex, break- 
ing, like the preceding, into square fragments. They are interspersed 
