Part of Gloucestershire and Somersetshire. 337 



3. Firm bed of limestone, with interrupted layers of\ 



sandstone, from 2 to 4 inches thick, closely in-C 12 feet thick, 

 corporated with and adherent to the limestone, y 



4. Bed of slate-clay and sandstone . . 6 inches. 



5. Sandstone and limestone intermixed . 1 6 



6. Bed of slate-clay and sandstone . . 6 



7. Sandstone, in strata disclosed for a few feet in depth, each stratum 



being from one to two feet thick. Below these, thin beds of lime- 

 stone again appear, in the quarry adjacent on the west. 

 The marly bed No. 2. is in particular rich in coralloid remains. In one 

 part, the beds are traversed by a slight vein of sulphate of barytes, bearing- 

 compact brown ironstone. 



Following the ridge to the south-west, transition limestone prevails, dipping 

 to the south-east, and higher up the valley, to the south-west, being curved 

 in that direction. In Whitefield quarry the beds, which dip 12° to the west 

 30° south, are composed as follows : 



1. At top, sandy slate-clay, and sandstone, with some limestone, and marly 

 clay, in beds a few inches thick, including in the lower part a layer of sul- 

 phate of strontian, in detached portions, three or four inches thick. 



2. Beds of limestone, four and five feet thick, alternating with beds of 

 quartzy sandstone one foot thick, and containing also thin streaks of the same 

 substance, all firmly adherent to each other. The sandstone is sometimes 

 much charged with chlorite. 



3. Beds of limestone, interstratified with thin layers of slate clay ; some- 

 times also enveloping rounded and angular portions of the latter, so as to form 

 a kind of conglomerate. 



4. Strata of clayey sandstone, slightly exposed . 



It was in the beds No. 3. that 1 found the fish bones already mentioned 

 (page 326) the patellite, and conularia ; and here also Dr. Cooke met with a 

 small insulated portion of slaggy mineral pitch. 



Similar beds appear to succeed each other, almost uninterruptedly, from 

 hence to the stream on the south-west ; beyond which, ascending Milbury 

 escarpment, transition limestone is exposed in continuous strata 10 or 12 

 fathoms in thickness, followed higher up by thinner beds, in alternation with 

 slate-clay and sandstone ; — all dipping into the hill, and there supporting (he 

 old red sandstone. 



2x2 



