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PREFATORY NOTICE. 
fragments of bones, and teeth, in the vertical and table-cases 
in the S.W. closet of the Museum; and in the vertical cases 
that form the exterior of the closet. Reptilian remains are 
there to be seen in thousands ; as will appear in Mr Seeley’s 
elaborate catalogues. Among these organisms are some in¬ 
structive remains of Dinosaurs, Crocodilians, Enaliosaurs, &c. 
&c. from our older Mesozoic rocks. But, by much the most 
numerous and instructive specimens are derived from the 
(so-called) “ coprolite diggings ” in the Upper Greensand , still 
going on in many open works near Cambridge. This deposit, 
though very degenerate in thickness, seldom much exceeding 
a single foot, abounds in organic remains. Several hundred 
species of Mollusks; fragments of the bones of Reptiles— 
Dinosaurs, Crocodiles, Enaliosaurs, &c. &c.; countless bones 
of Chelonians, of many species; countless bones, broken 
jaws, teeth, vertebrse, &c. of Ornithosaurians (Pterodactyles); 
—such is the wonderful ancient Fauna of our degenerate 
Upper Greensand, which lies between our Galt (the well- 
known brick-earth of Cambridge) and the lower, flintless 
Chalk. Little would have been known of these fossils but 
for “ the diggings ” in search of the phosphatic nodules which 
are distributed in millions through the formation, along with 
the organic fossils. 
Under the Galt is the brown ferruginous sand (sometimes 
though rarely tinged green by silicate of iron) which holds 
the water of our Artesian wells. It caps the hills at Ely and 
Haddenham, and may be traced towards the N.E., skirting 
the dead level of the fens, by Downham; by the sandy hills 
south of Lynn; and thence along the base of the sandy 
country that extends toward Hunstanton. In this course it 
appears to rest chiefly on the Kimeridge Clay; but near the 
“ Upware diggings ” it, for a short distance, appears to over¬ 
lap the Coral Rag. 
Towards the S.W. it may be traced, though not at first 
continuously, breaking out here and there from under the 
glacial drift. It gradually increases in thickness till it forms 
a continuous feature in Bedfordshire; and in its course, after 
