36 J. SHIPMAN : ANCIENT BEACH AT CASTLE DONINGTON. 



shallow and obscure that it might have disappeared in that direction 

 without being distinctly observable. IMr. Horace Brown, who also 

 made a careful examination of the section, has since suggested to me 

 as a probable explanation of the difficult}', that ' as the Carboniferous 

 strata must in Triassic times have dipped seawards at an angle of 

 something like 20' (for we must, of course, subtract the dip of the 

 Keuper, which is roughly in the same direction), there must have 

 been from time to time great slips, and that it is extremely likely that 

 all traces of these landslips were not worn away before subsidence 

 had carried them below the surface action of the waves, and 

 sufficiently deep to have laid down upon them the early deposits of 

 the Keuper sea/ 



A careful examination of the surface of the ground when the 

 site was first cleared for the well, and afterwards during the progress 

 of the work of sinking, showed that the old shore line of Carboni- 

 ferous rocks was worn back into little inlets, separated by rounded 

 buttresses of rock, describing a series of parabolic curves, and did 

 not run in anything like a straight line. 



Lov\-ER Keuper restin(; on the truncated edc;rs oi- 

 Lower Coal Measures at Castle Donlxgton. 

 /. Road to Cavendish Bridge. 



c. Drift and brickyard debris. 



d. Red shaly clay. 

 c. Breccia. 



h. Chocolate-red sandstone, with greenish-yellow streaks in it. 

 a. Lower Coal Measures or Gannister beds. 



The middle or main terrace shown in the excavation presented a 

 nearly level surface on which the lowest beds of the Keuper rested, 

 with an inclination towards the south-west of Z\ It was now seen 

 that the chocolate-coloured sandstone below the breccia belonged to 

 the Keuper. This sandstone was six feet thick, and lay in regular 

 beds, about a foot thick. It contained no pebbles, except a few small 



Natural )>t. 



