200 



PROCEEDIiS^GS OF THE GEOLOGICAL SOCIETY. 



[Jan. 8, 



It is rather singular that the strata here should dip north-east 

 while those on the opposite side of the Severn dip to the south- 

 east. It shows an anticlinal to exist somewhere to the south of 



Fig. 1.- 



-Section from Ashley Down to Cotham. 



E. 



Ashley Down. JVIontiielier 



Quarry JSTo. 1. Quarry Jfo. 2. Farm. 



W. 



Picton Quarry 



Street. No. 3. Cotham. 



Keuper, 



that river. The rising of the land must of course be very gradual, hut 

 quite sufficient to form a shallow trough from the neighbourhood of 

 Gloucester towards the British Channel — an idea coiitirmed also by 

 the observations in the Gloucestershire collieries below the surface, 

 and by the denudation that has evidently taken place above it. 

 The latter especially shows a very strong current to have existed 

 ever since the Triassic period, running from north-east to south- 

 west. The edges of the strata, where they crop out of the hill-sides, 

 show very plainly that many miles of deposits that formerly existed 

 between the Silurian and Oolitic shores must have been washed 

 away. 



Starting, then, from Ashley Down, we commence with what is 

 now exposed of the Ammonites- Turneri and A.-Bucldandi zones. 



Fig. 2.— Section of No. 1 Quarry, Ashley Down. 



ft. in. 



i Soil and Rubble. 



^o. L ^ I '^ f ' ^" ^^^ 1 ^ Shales. Ammonites semicoxf a.; kjs, Ao'od its nobil is, and Pen- 

 N"o.2. 



Xo. 3. 



No. 4. g < 



1 3 Saurian bed (Shales). IMhynmums. 



10 Limestone. Ammonites Bucklandi, A. Conybear\ 



Beds of Limestone 

 Arated bv 

 k Shales. 



Gn/phcen incurccf, Plieatvla 

 iui'uf^s^ritiUi, Ammonites un- 

 gulatus, Entomostraca. 



