228 THE EH^TIC EOCKS OF PYLLE HILL, BEISTOL. 



very little about them here. The beds have a less thickness 

 than that which they nsaally attain in the West of England, 

 not exceeding 9 ft. 6 in. at Pylle Hill. They have the typical 

 lithological character, and contain the characteristic fossils of 

 the Avicula contorta beds in great profusion at certain levels ; 

 there is no " bone-bed " at their base in any way comparable 

 with the well-known " bone-bed " of Aust Cliff, but instead 

 there is at this horizon a thin seam of quartzose grit contain- 

 ing fish-teeth, scales, and fin spines, quartz pebbles and cop- 

 rolites. The presence of the little ophiurid, Ojphiolepis 

 Damesii (Wright), in bed " / " is worthy of note, and the 

 blue shelly limestone " g " near the top of these shales — the 

 only definite and persistent hard bed in the series — has 

 yielded large numbers of small bivalves and univalves in a 

 solid state, and some of these appear to be new to this 

 country, if not to science. 



SECTION AT PYLLE HILL (TOTTERDOWN), BEISTOL. 



ft. in. 



^Am. {G£goceras) _2:)7«7zor- 



his^ Am. {(Egoceras) 



torus, D''Orh. = John- 



■<! stoni, Sow. 



Lima gigantea, Phola- 

 domya glabra, etc. 



w 

 m 



Q 



O 



V. Soil, with limestone rubble 2 



t. Limestones and Shales, regu- \ 

 larly bedded, in alternat- > 

 ing seams of from 2'' to 6" ) 



s. Limestones, regularly bedded \ 

 in seams of from 2" to 4", \ 

 with laminated shaly I 

 partings ) 



r. Limestone, light coloured, ) 

 argillaceous, rubbly . .j 



q. Limestone, ditto, ditto 



p. Limesto7ie, ditto, with bi- 

 valve shells, chiefly as 

 casts 



o. Shales, brown, arenaceous, 

 finely laminated, with I 

 small crushed bivalves . J 



4 5 



1 Ostrea liassica. 



Lima gigantea {?). 



fModiola minima, Monotis 

 decussata, Lima gigan- 

 tea {?), Pleiiromya sp. 



9 Monotis decussata 



