OPHIODERMA. 145 



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



(See p. 146.) 







i\o. 



LiTHOLOGY. 



Thick 



Organic Remains. 









NESS. 













Feet. 











Drifted gravel beds. 









f 



1 



Brown sands, sometimes micaceous. 



140 



Ammonites opalinus, Rein., A. Jurensis, 







with inconstant layers of large sand- 





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



w 







stone nodules ; the fossils are in the 





latidorsatus, d'Orb., Belemnites, Pec- 









uppermost Cephalopoda-bed. 





ten barbatus,^ow., Uhijnchonella cyno- 



o 



CO 











cephala. Rich. 



< 





2 



Dark-greyish clay and sandy marl. 



70 





M 



1-3 





3 



Brownish marly limestone ; many of the 



2 



Ammonites serpentinus, Rein., A. bi- 



s 







blocks on the shore are very full of 





frons, Brug., A. Raquinia^ius, d'Orb., 









fossils. 





A. communis, 8o'W., Rhynchonella JBou- 



u 











ckardii,J)ar., Leptcena liassina, Bouch. 





L 



4 

 5 



0 



7 



8 



Dark-greyish sandy marl and clay, 

 xiiuuidicu odiiUj loriniDg jargp Sauasioiic 



h I A /» 1^ o 



Light-brown sands, more or less indu- 

 rated, and very micaceous. 



Blue marl, forming a well-defined band 

 in the section. 



Greyish, sandy, laminated marls, with 

 many fossils. 



15 



0 



60 

 6—8 

 1 



Ammonites margaritatus, Mont. 



Am. margaritatus, Mont., Am. fimhria- 

 tus, Sow., Pecten cequivalvis, Sow., 



o 



<N 











Terebratula cornuta. Sow. 



EH 

 P 





9 



Foxy coloured, marly sands, with 12-16 



40 





O 

 pq 







inconstant bands of sandy nodules in 







< 



i ' 



l-H 







tiers in the bed. 









10 



Thin inconstant band of Crinoidal lime- 



1 in. 



Pentacrinus Johnstonii, Aust. 



H 







stone. 







fi 

 P 





11 



Grey, sandy clay, passing into irregular 



36 



Pecten cequivalvis, Sow., Gryphcea Mac- 







laminated sandstone. 





cullochii, Sow., fragments of Penta- 

 crinus. 







12 



The Star-fish bed, hard, grey, micaceous 

 sandstone, falling in large blocks. 

 Un the under side or some the Ophi- 

 urse are exposed. 



4—6 



Am. margaritatus, Mont., A. fimbriatus. 

 Sow., Ophioderma Egertoni, Brod., 

 Ophioderma tenuibrachiata, Forbes. 







13 



Grey micaceous marls ; in the upper part 

 are several rows of fossiliferous no- 



90? 



Am. margaritatus, A. Normanianus, 

 d'Orb., Belem7iites clavatus, Biain., 



L 





dules. 





Pleurotomaria, Chemnitzia, &c. &c. 









Base of the clifis. 







