38 



and soft Marls (termed tea-green marls) ; these are conformably 

 succeeded by 66 feet of Grey, Brown and Black Shales with 

 many bands of Argillaceous Limestones ; the upjDer portion of 

 those Shales from the White Lias down to the Bone Bed 

 (26 feet) is extremely rich in organic remains. Most of the 

 known Upper Rhsetic forms occur through this series; the 

 following Species were collected : 

 Avicula contorta 



Lima precursor 

 Modiola minima 

 Placunopsis alpina 

 Ostrea intusstriata 

 Gervillia precursor 

 Pecten Valoniensis 

 Cypricardia suevica 

 Cardium Ehseticum 

 Pullastra arenicola 

 Myacites striato-granulata 

 Myoplioria jjostera 



Pleurophorus angulatus 

 " elongata 



Anatiaa prsecursor 



// SuessiL 



" elongata 

 Annellide tracks 

 Saui-iclithys apicalis 



" acuminatus 

 iSargodon tomicus 

 Gyrole[)is tenuistriatus 



'/ Albert! 

 Hybodus pyramidatus 



The capping to the Ehsetic Black Shales, by the White Lias, 

 or its representative although differing Hthologically from the 

 Pinhay, Saltford, Currey-Eival and other type localities, is 

 here clearly shewn, the Cotham Marble bed being weU defined 

 within 16 inches of the Black Shales; its base is much 

 indurated. A small oyster was the only contained form I 

 recognised at St. Audrey's. 



The Ostrea series, about 20 feet thick, rests upon the White 

 Lias. They are very fossiliferous, but richer in individuals than 

 in species. The abmidant forms are Ostrea Liasica Mod. minima, 

 Lima punctata, and Carpenteria. These and the Planorbis Lime- 

 stones are the equivalents of the well-known Saurian beds of 

 Street, &c., and contain Plesiosaurus Dolichodeirus, P. Hawkinsi, 

 and Ichthyosaurus. 



These Species were obtained from the foreshore immediately 

 west of St. Audrey's slip. A marked feature in the section are 

 the Planorbis Beds, 24 feet in thickness, and in many places 

 crowded with this Ammonite, the shell in the higher portion of 

 the series is replaced by, or converted into, crystallized Sulphate 



