400 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 6, 



ferruginous, siliceous and compact ; below these compact beds are 

 eight feet of dark soft shaly sandstones overlying twelve feet of sand- 

 rock (E), this bed being the lowest visible in the section, and form- 

 ing the base of the curve, which with the adjoining flexure and con- 

 nected fault produces the remarkable and picturesque feature of 

 this portion of the section. (See general section.) 



The fossils of this division are exceedingly few, and confined 

 chiefly to the upper beds, the remains of plants being more abun- 

 dant than those of Testacea : of the former few can be recognised, 

 with the exception of the JEquisetum Lyellii, which is irregularly 

 dispersed, and fragments and lumps of coaly lignite ; associated with 

 these are some casts apparently belonging to one or two species of 

 U7iio. 



Fig. 2. Enlarged view of the Fault at E, Quarry Hill Section (fig. 1). 



The fault* just alluded to (fig. 2) exhibits the dislocated edges of 

 these light-coloured sand-rocks in contact with a dark clay, which 

 may be identified by its organic remains and lithological structure 

 with that of the upper division (B) above the sand-rocks. The vsame 

 clays continue to the end of the cutting. (See general section.) 



Crossing the valley we arrive, at a distance of about a quarter of 



Fig. 3. Section North'of the Powder Mills. 

 B 



6 Dark grey clays full of Cyrena media, passing downwards into a lightish green clay, 

 and then into greenish grey shalv clays full of the Cypris Vuldensis, and with nu- 

 merous bands of concretionarv and nodular calcareo- argillaceous ironstones full of 

 the Uiiio Gaulteri, Cyrena media, Paludiiia elongata, and Cypris ; also thin slabs 

 of sandstone covered with vermiform impressions. 



5. Whitish soft massive sandstone ; at the top of it, Cpena and vegetable impressions are 

 conamon. 



4. Soft white decomposing argillaceous sandstone. 



3. Whitish massive sandstone, with probable traces of Unio. 



'2. Traces of grit. . ; . , 



1 . Dirty white fissile sandstone ; lower part more massive : stratification very irregular 

 and slightly unconformable to the overlying bed. 



* The difference of level produced by this fault may probably be about 200 feet. 



