240 



PROCEEDrN"aS OF THE GEOLOGICAL SOCIETY. [Jan. 22, 



Fossils of the Middle Kimmeridge of Filey Bay. 



c. Pecten, sp. 

 c. Pinna granulata, Sow. 

 r. Modiolabipartita,PA27.(non Sow.). 

 r. Leda, sp. 



r. Ceromja excentrica ?, Ag. 

 c. Mjacites, sp. 

 c. Pholadomya, sp. 

 ? Thracia depressa, Sovj. 

 r. Ehynchonella, sp. 

 r. Pentacrinus, sp. 

 c. Sponges. 



C. Wood, both in the state of jet and 

 mineralized by pyrites. 



c. Belemnites Trosloyanus, D' Orb. 

 C. nitidus, Dolifuss. 



c. Ammonites mutabilis, Sow. 



c. biplex, Sow. 



r. triplicatus, Sow. 



r. Marantianus ?, D' Orb. 



r. Yo? D'OrbQnr.). 



T. Berryeri ?, Lesueur. 



r. , sp. 



r. Ancyloeeras ?, sp. 



r. Ostrea, sp. 



C. Exogyra yirgula, Defr. (var.). 

 C. nana, Soiu. 



r. Plicatida, sp. 



Not less satisfactory than in the preceding case, is the identifi- 

 cation of these beds with the Middle Kimmeridge (Eegion of Am- 

 monites mutabilis and Exogyra virgida of Dr. "Waagen). The dif- 

 ferent beds of this age present many features of very great interest, 

 but have never received that amount of attention which they de- 

 serve ; in Lincolnshire they farnish a large and well-marked fauna, 

 being exposed in a number of clay-pits (of which I may especially 

 instance those of Horncastle and Usselby *), and also in the Wrawby 

 cutting of the Manchester, Sheffield, and Lincolnshire Railway. The 

 uniformity of character in the Kimmeridge clay, as seen in Dorset- 

 shire, Lincolnshire, and Yorkshire, is very striking. 



G. Lower Kimmeridge. — Near Mile Haven, according to the tes- 

 timony of fossil-collectors and others, certain beds of blue clay were 

 at one time exposed, the septaria of which yielded a different series 

 of fossils from those of the beds last described ; among the fossils 

 so obtained, 1 have seen undoubted specimens of Ammonites alter- 

 nans, Von Buch, and Khynchonella inconstans, Sow. 



Dr. Waagen's lower division of the Kimmeridge Clay appears, at 

 all events in Lincolnshire, to be divisible into two well-marked 

 zones. In the upper of these, which may be well studied in the 

 clay-pits about Market Rasen, Ostrea deltoidea never, I believe, occurs, 

 while in the lower, which is well seen in a pit at Woodhall, that 

 fossil occurs in prodigious numbers. A number of other palaeonto- 

 logical characters also assist us in separating these two zones. The 

 beds seen in Filey Bay appear to be referable to the upper of 

 these ; but the lower would seem, from a statement of Professor 

 Phillips, to be found inland at Elloughton f. 



No other deposits of Mesozoic age are seen in Filey Bay, until 

 we arrive at the Brigg, where, as is well known, the Lower Calca- 

 reous Grit, covered by a few feet only of the Coral Ptag, rises above 

 the sea-level, and is seen in the cliff below the Boulder- clay. 



YI. Co^rcLusiox. 



In bringing this paper to a close, it may be well to recapitulate 

 briefly the results arrived at. They are as follows : — 



* This pit is now, I believe, closed. t Geology of Yorkshire, p. 46. 



