474 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 9, 



Cambrian, Carboniferous, Lias, Middle Oolites, Kimmeridge Clay, 

 Shaiiklin Sands, Speeton Clay, chalk and flint, and lignite, and 

 these in such proportion that it can hardly be called a flint-gravel. 

 Besides these are numerous balls, rough and round, formed of pieces 

 of clay which had rolled on a shore and so acquired a coating of 

 pebbles. 



At the top is an earthy gravel with Ostrea edulis, Mytilus edulis, 

 Cardium edule, &c., very recent; for the Mytilus still preserved its 

 epidermis. 



The large shells were broken, and all showed marks of drifting, 

 in breakage, wear, or separation of the valves. Among others were : — 



Buccinum undatum. 

 JNassa reticosa. 



reticulata. 



Fusus antiquus. 

 Tellina obliqua. 

 Cardium edule. 



Mytikis edulis. 

 Mya truncata. 

 Scrobicularia piperata. 

 Ostrea edulis. 

 Cyprina islandica. 

 Corbula nucleus. 



Associated with these were a Crioceras from the Speeton Clay, 

 Millericrinus probably from the Coral Rag, pieces of shelly Oolite, 

 Ammonites communis, A. annularis, and A. Buchlandii, a Lias 

 Belemnite, Gryphoea incurva, Carhonicolce, and Palaeozoic Rhyn- 

 cTionellw. 



Southward to Lynn there is on the west a flat of Kimmeridge 

 Clay, and over this on the east is Carstone and sands, but so abrupt, 

 and so beautifully worked into chines, that one continually turns 

 round to look for the sea, now far away, which once wore and washed 

 them. Gravels occur all along, similar to those ferruginous beds 

 spread about Lynn, and which extend south by WaUington. 



Near Peterborough, at Overton Waterville (or, as it is called by 

 the country-people. Cherry Orton), is a pit which, although it has 

 been noticed, and plates of its fossils given, by Dr. Porter in his 

 " Geology of Peterborough," I must here say a few words about. 



There is much gravel round Orton ; but, as Dr. Porter has re- 

 marked, it is only at this pit that shells are found. 



In the section, which was some 12 feet deep, there is (1) earthy 

 gravel with the usual pipes, one of which is shaped like a flask. 

 These pipes descend into a gravel (2) with little sand, in which 

 the worn flint and Oolitic fragments rest flat, with vacant inter- 

 spaces — a feature also noticeable in several neighbouring pits. It 

 also, as do other local gravels, contains numerous dark shining 

 pebbles from the Carstone, but they are less numerous than at 

 Whittlesea. Below this is a shell-gravel (3) half made up of fluvio- 

 marine shells, from which my shells were taken. Then comes (4) 

 a brown clay, full of httle calcareous concretions, but with few, if 

 any shells, though at its base I found one JRissoa and one Cyclas; 

 but they may have belonged to the subordinate bed (5), which is a 

 marly slate -coloured clay, mottled with iron, with freshwater shells 

 scattered through it. 



The drift-deposits already referred to are to the north of Cam- 



