Note:  Do not rely on this information. It is very old.


Cornbrash, one of the most persistent divisions of English Jurassic rocks, varying from 5 to 15 feet thick, traceable from Dorsetshire to Scarborough, forming the uppermost member of the Bathonian (Lower) Oolite, and named from its crumbly or "brashy" soil and great fertility. This latter character is attributed to an exceptional percentage of phosphate of lime.