83 



Bradford Abbas and Halfway House it will be well to give the 

 following 



Section of Bradford Abbas (East Hill) quarry. 



ft. in. 



1. Soil 4 



2. Wbite Oolite -with irregular cleaveage . . 6 



3. Band of Marl with Astarte . . ..03 



4. Hard iron-shot rock with Astarte, Ammon- 



ites, Belemnites, etc. . . . . 10 



5. Band of brownish stone with Ammonites 6 



6. Iron-shot Oolite, a mass of Cephalopods 1 



7. Marl with Astarte trigonalis . . ..03 



8. Bed with Univalves . . . . ..09 



9. Blue centred Oolite . . . . ..12 



10. Reddish sands, commencing the Freestone 



system of Ham Hill and the Cotteswolds. 



(These latter are from 100ft. to 150ft. in thickness, occasionally 

 interpolated with bands of Oolitic stones.)* 



The following is a description of species : — 



ASTAKTE OBLIQUA, (dESh). FIG. 1. 



Cypricardia Lam. 



Shell suborbicular, posterior margin very oblique going from 

 the umbo in quite an oblique direction, upj)er margin lunulate ; 

 Lunule spoon-shaped ; shell smooth ; with very indistinct maik- 

 ings, interior teeth well produced ; Shell one of the thickest of 

 the series. 



It occurs very plentifully at Halfway House and Bradford 

 Abbas quarries ; most of the specimens have the valves separate, 

 though sometimes with the two valves in contact. This is perhaps 

 one of the commonest forms in the district. 



Proportions : Length, 30 lines; breadth, 24 ; depth, 18. 

 * See proceedings of Dorset Natural History Field Club. 



