1867.] 



BtTETON EH^TIC BEDS NEAE GAINSBOEOirGH. 



321 



with some degree of probability be made out ; and I have endea- 

 voured in the accompanying map, taken from the Ordnance Survey, 

 to define them. To the east of the Triassic escarpment, extending 

 from the Ehaetic cutting at Lea northwards towards Gainsborough, 

 the land lies in a gentle slope, rising again, though very slightly, at 

 a distance of less than a mile on the average, with an outcrop of 

 Liassic clays ; and in the hollow between these ridges, judging from 



Pig. 2. — Sketch Map showing the extent of the Bhcetic Beds 

 near Oainshorough. 



Lias. 

 '■^^m Ehaetic Beds. 

 Trias. 



the direction of the dip, and the general trend of the land, it ap- 

 peared to me likely that the Ehaetic beds would be found on the 

 surface ; and hearing that a well had been dug in the line of this 

 depression, near a farm-house marked on the map, about 3 miles 

 north of the Lea-beds, I examined the earth thrown up, and found, 

 as I anticipated, the various stones and shales of the Ehaetic zone, 



