472 pnocEEDiNas op the geological society. 



White Lias 2a. 



ft. in. 



^ White Lias "Sun Bed" 1 3 



Thinbed 2 



WhiteLias 8 



Ditto 8 



I Ditto 8 



I Thin shell, six thin beds 1 2 



and I WhiteLias 6 



Clay 2 



I WhiteLias 2 



Rhsetic Beds 2. ■{ j\-l^ k 



Ditto 5 



Ditto 2 



Ditto, " Tile Bed " 5 



Ditto 2^ 



White Lias, Bottom bed 7 



Avicula-contorta marls, estimated from coal- 

 shafts 14 6 



Greenish marls, base of Ehsetic, in roadway to 



1, Eadford 10 



Keuper 1. Eed marls of Keuper towards Eadford 



In this truly interesting section are embraced within 100 feet all 

 the beds between the Keuper and the Upper Eagstones of the Infe- 

 rior Oolite. 



The Keuper (1). — Eed marls of this formation are exhibited in the 

 roadway leading from Camerton to Eadford, but do not call for any 

 special obseryation. 



Rhcetic Beds (2). — The basement marls of this formation rest im- 

 mediately upon the above. The superimposed Avicula-contorta clays, 

 not being open, are estimated from sinkings made for neighbouring 

 coal-shafts. 



The White Lias {2 a) throughout the whole of this district varies 

 very little in thickness, and has always present its uppermost charac- 

 teristic ^' Sun-bed." Its general characters being so uniform, the 

 former notice I have given of it at Camel and Hatch will suffice. 

 In this district it is usually very unfossiliferous. 



The Lower Lias (3). — The moment we pass the above horizon 

 the most interesting evidences of unconformability are everywhere 

 found. Between the ''Sun Bed" and the "corn-grit" in this 

 series we ought to find the two lower zones of Ammonites pla- 

 norhis and A. angulatus. As the " Grey Lias " beds in this section 

 are undoubtedly on the same horizon as the Ammonites- BucHandi 

 beds, it is at once seen that the lower members of the Lias are here 

 altogether wanting. Kot only are the basement Insect-beds absent, 

 but the whole of the 186 beds given at Camel, above the White Lias, 

 are unrepresented. In a section at the Wells Way Quarry, at Ead- 

 stock, the beds on this horizon are about forty in number. At this 

 place the thin bed of marl between the corn -grit and the White Lias 

 has its thin laminae accommodated to the undulated surface of the 

 latter, and contains scattered remains of Liassic fishes. Wherever 

 the Lower Lias is worked, for miles around, it is always in beds 

 having the same geological horizon as the Camerton Grey Lias ; and 



