THE INFERIOR OOLITE OF DORSET. 



589 



Hill and Wyke quarries this zone is only represented by two thin 

 layers very much charged with iron, the two being only about 

 6 inches thick, but containing nearly all the species that one finds at 

 Oborne in the IlumpJiriesianum-zone. 



Above this conies the zone of Cosmoceras ParJcinsoni, which varies 

 very much in different positions. Near Sherborne it is about 15 to 

 20 feet thick, but very unfossiliferous. At Bradford Abbas it is 

 about 6 feet thick, the upper part having probably been washed 

 away ; it is rather unfossiliferous. At Clifton Maybank, however, 

 about 2 miles from Bradford Abbas, a small opening in this zone 

 was made ; and it was found highly fossiliferous, while at Broad 

 Windsor, and near Bridport, it contains a large number of species and 

 specimens. 



I here give sections of three quarries — one at Oborne, the other 

 at Wyke, and the third at Bradford Abbas — to show the different 

 beds clearly. 



Fig. 1. — Section at Oborne, near Sherborne. 



Zone of Ammonites Tarkin- 

 soni. 



Zone of StepJianoceras Hum- - 

 phriesianum. 



Bed with Sphceroceras Sauzei 

 &c. 



Probably zone of Harpoceras ■> 

 Sowerbyi. 



Bed with Bhynehonella rin- 

 gens. 



Unseen. 



Light-coloured stone, 2 feet. 



Soft sandy stone, 2 feet. 



Harder stone, iron grains, 3 feet. 



White marl, with green grains, 

 6 inches. 



Hard blue and yellow stone, about 

 2 feet. 



! Soft yellow sandstone. 



