VOL. XVIII (2) DEEP BORING AT KEMBLE 187 



Upper Coral-Bed, or representative of the Dundry Freestone 

 in between them. 



The Upper Trigonia-Gvit here rests directly upon the 

 Lower Freestone, the top-stratum of which was noticeably 

 bored. The fact that the " Grit " rests directly upon the 

 Lower Freestone, is important in connection with the repre- 

 sentation of the results of the Bajocian Denudation.' The 

 Lower Freestone is 43 feet 6 inches thick, well oohtic and pale- 

 yellow. It rests upon the Pea-Grit, which is 35 feet 6 inches 

 thick, but of bluish-grey tint. An important fact, from a 

 geological standpoint, was next observed, namely, that the 

 Pea-Grit here rests directly upon the yellowish-brown, iron- 

 shot Cephalopod-Bed, without the intervention of any Lower 

 Limestone or Scissum-Beds. 



Upper Lias. — There was no mistaking the Cephalopod- 

 Bed. Its rich yellowish-brown colour and irony-grains had 

 led the workmen to call it " the ironstone." It was not pos- 

 sible to determine the precise hemerae to which the deposits 

 composing this 6-foot Cephalopod-Bed belonged ; but the 

 hard " cap " or Opaliniforme-Bed did not appear to be 

 represented. 



The line of demarcation between the Cephalopod-Bed 

 •and Cotteswold Sands was very sharp. The Sands, when 

 dry, were grey in colour, but a pretty green when freshly 

 brought up to the surface, and therefore moist. Compared 

 with the Sands on the Cotteswold edge, these sands from the 

 Kemble bore-hole contained a large amount of argillaceous 

 material ; but the explanation doubtless is that percolating 

 waters have washed out most of it from the deposit where it 

 occurs near the edge of the hills. 



1 Vide Quart. Joum. Geol. Soc, vol. hdi. (igoi), plate vi. 



