Mr Grimes' 1 Observations on the Flints of' Warwickshire. 77 



Art. XIV. — Observations on the Flints of Warwickshire.* By 

 Edward Grimes, Esq., R. N. Communicated by Tho- 

 mas Allan, Esq. 



J. observed these flints first at Churchover in Warwickshire ; 

 but have since traced them from about ten miles north of Lei- 

 cester to the village of Brandon, about ten miles south of 

 Rugby, comprising a distance of about forty miles north and 

 south ; also to about fourteen miles eastward of Churchover, 

 towards Northampton. In the direction of Coventry thev do 

 not appear to extend beyond Brandon, where the style of the 

 gravel alters. They are the common chalk-flint, and are 

 found in the gravel, and in the ploughed fields. They appear 

 to have been broken by some convulsion, probably while in 

 the matrix, and the fracture has been flat, and not conchoidal. 

 It is also remarkable that many of them have lost an interme- 

 diate portion of their substance, as if they had undergone 

 considerable attrition ; and the two parts have been so exactly 

 adapted, and so firmly re-cemented to each other, that the 

 line of junction, on a transverse fracture, is sometimes hardly 

 perceptible, and is occasionally indicated by a white mark. 



Most of these flints have lost the angles which they had ac- 

 quired by fracture, either from rolling or decomposition, 

 though some few still remain perfect. They do not appear to 

 have been separated in a soft state, for they bear no mark of 

 compression. 



The principal line of dislocation is generally longitudinal, 

 though they have often had many crooks besides, in all di- 

 rections, as is shown by a very perceptible ridge or line upon 

 the surface. (See specimen, letter A.)-f- Such a fact would he 

 exhibited in a piece of wax, if cut through with a hot knife, 

 and immediately reclosed. 



They have no appearance of having been acted upon by 

 fire. 



* Read before the Royal Society, December 2, 1823. 



■f Tbe specimens described in this paper arc deposited in the Museum of 

 the Society. Tbe references to them are left for the sake of those wbo 

 may wish to examine them. 



