256 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 25, 



n 



if 



o 6 



Cm ^_^ 

 t3 



Description of Strata. 



crushed shells : — concretions of impure 

 ironstone in the centre. 



71. Light yellow and brown hard lime- 

 stone, weathers roughly : — traces of Flan- 

 orbis in patches of clay. 



70. Light greenish marly limestone, with 

 one foot of green marl and one foot of red 

 clay beneath. — Note. This and the pre- 

 ceding bed become softer and thin out to 

 the eastward. 



69. Series of hght green, yellow and 

 brown marls, with a few shells — contains 

 irregular layers of hard siUceous concre- 

 tions and a few argillo-ferruginous concre- 

 tions. 



68. Light yellow calcareous rock ; in the 

 upper part a few angular pebbles. There 

 are two layers of hard siliceous concretions, 

 one in the middle and the other at the 

 bottom. PlanorUs and Limncea abundant. 

 This rock becomes much softer and more 

 sandy to the eastward. 



67. Very soft calcareous rock full of 

 Planorbis and Limnaa, with remains of 

 PalcBotherium and Turtle. 



66. Grey sand. 



65. Striped light green sand and marl. 

 Numerous Cyrena. 



64. Brown sand. 



63. Dirty green clay. 



62. Very soft earthy limestone full of 

 Planorbis. 



6L Indurated green marl. 



60. Light greenish and whitish marls 

 with a few rolled pebbles. Ostrea com- 

 mon. 



59. Light green marl. 



58. Greenish yellow sandy marl over- 

 lying brown clay. Shells numerous. Traces 

 of vegetables common between the two 

 clays. (? Gyrogonites.) 



57. Light green marl; a few shells in 

 the upper part, and three inches of brown 

 clay full of shells underlying it. 



56. Indurated marl, with a few shells, 

 and two inches of lignite below. 



55, 54, Indurated marl overlaid by six 

 inches of green marl — both full of shells. 



53. Green marl passing into yellowish 

 [ green ; full of shells. 



n 



Feet. 

 60 

 15 



10 



10 



20? 



20 



5 

 1 



10? 



1 

 1 



1 



4- 



Association of genera and 



characteristic species in the 



chief fossiliferous beds. 



71-62. 

 Limnaea obovata. 

 Cyrena. 



Melanopsis carinata. 

 Planorbis euomphalus. 



n 



190 



61-53. 

 Ostrea, 2 sp. 

 Natica. 



Fusus labiatus. 

 Melania fasciata. 

 Neritina concava. 

 Melanopsis. 

 Cyrena obovata. 

 Potamides cinctus. 

 P. ventricosus. 

 P. concavus. 

 Corbula. 

 Balanus. 



