Quart. Journ. Geol. Soc. Vol. LXVIII. PI. XXVI. 



a red line runs parallel with 

 .euper Marl overlies the rock, 

 rals around the margins express 

 >ve sea-level (or other datum) 

 ir upon which the Trias rests. 

 aced in front of a numeral in- 

 ias rests upon the rock; the 

 y placed indicates that there is 

 hat the level taken is the top, 

 the present time. The dotted 

 rs of the buried rock, inferred 

 rements and from other obser- 



" A 





