OPHIODERMA. 



145 



Section of the Middle and Upper Lias at Down Cliffs, near Bridport Harbour, Dorset. 



(See p. 146.) 







No. 



LiTHOLOGY. 



Thick- 

 ness. 



Okganic Remains. 







Feet. 









Drifted gravel beds. 







f 



1 



Brown sands, sometimes micaceous, 



140 



Ammonites opalinus, Rein., A. Jurensis, 









with inconstant layers of large sand- 





Zeit., A. variabilis, d'Orb., Nautilus 









stone nodules ; the fossils are in the 





latidorsatus, d'Orb., Belemnites, Pec- 









uppermost Cephalopoda-bed. 





ten barbatus, Sow., Bhynchonella cyno- 



o 



CO 











cephala, Rich. 







2 



Dark-greyish clay and sandy marl. 



70 









3 



Brownish marly limestone ; many of the 



2 



Am?nonites serpentinus, Rein., A. hi- 



PS 







blocks on the shore are very full of 





frons, Brug., A. Eaquinianus, d'Orb., 



p^ 







fossils. 





A. communis, 8ovf., Rhynchonella Bou- 



p) 











chardii,J)a.v., Leptcena liassina, Bouch. 





- 



4 



Dark-greyish sandy marl and clay. 



15 



Ammonites margaritatus, Mont. 





' 



5 



Indurated sand, forming large sandstone 

 blocks. 



8 









6 



Light-brown sands, more or less indu- 

 rated, and very micaceous. 



60 









7 



Blue marl, forming a well-defined band 

 in the section. 



6 8 









8 



Greyish, sandy, laminated marls, with 

 many fossils. 



1 



Am. margaritatus, Mont., Am. fimbria- 

 tus, Sow., Pecten cequivalvis. Sow., 



o 











Terebratula cornuta, Sow. 



EH 





9 



Foxy coloured, marly sands, with 12-16 



40 





o 







inconstant bands of sandy nodules in 







-«1 

 < 



H 







tiers in the bed. 









10 



Thin inconstant band of Crinoidal lime- 



1 in. 



Pentacrinus Johnstonii, Aust. 







stone. 







p 





11 



Grey, sandy clay, passing into irregular 



36 



Pecten cequivalvis, Sow., Gryplicea Ifac- 



^ 







laminated sandstone. 





cuUochii, Sow., fragments of Penta- 

 crinus. 







12 



The Star-fish bed, hard, grey, micaceous 

 sandstone, falling in large blocks. 

 On the under side of some the Ophi- 

 urse are exposed. 



4—6 



Am. margaritatus, Mont., A. jimhriatus, 

 Sow., Ophioderma Egertoni, Brod., 

 Ophioderma tenuibrachiata, Forbes. 







13 



Grey micaceous marls ; in the upper part 

 are several rows of fossiliferous no- 



90? 



4 



Am. margaritatus, A. Normanianus, 

 d'Orb., Belemnites clavatus, Blain., 

 Pleurotomaria, Chemnitzia, &c. &c. 



l- 





dules. 



1 







Base of the clifis. 







