Vol. 60.] 



SECTIONS IN THE BRISTOL DISTRICT. 



173 



absent. In the clay-pockets that lie between the beds a very few 

 teeth may be found. It never fills up these pockets, but is only 

 found on the cut-off surfaces of the limestone-bands. 



The Bone-Bed contains very numerous fish-remains, all except 

 the smallest being fragmentary, tightly cemented together by a 



reddish-brown. 



gritty 



calcareous sandstone. The whole is very 



hard, and fossils are difficult to knock out entire. In addition 

 to the teeth, scales, and bones mentioned above, there are : — 

 (i) numerous coprolites, sometimes an inch in diameter ; (ii) small 

 rounded quartz -pebbles, with a peculiar resinous surface in many 

 cases, varying in size from that of a millet-seed to that of a small 

 walnut; (iii) angular or subangular pebbles of Carboniferous Lime- 

 stone ; and (iv) well-rounded pebbles of sandstone from the Upper 

 Carboniferous-Limestone Series, fairly numerous, and often measuring 

 2 inches in diameter. 



Between the two exposures above described, an extensive cutting, 

 displaying the Lower Ehastic beds especially, has been made ; the 

 succession is as follows : — 



Q. 



N. 



Feet 

 o 



inches. 





 4 to 6 



M 



Rubbly limestone. 



Cotbam Marble, very 



inconstant, in patches 



about a yard across, and 



4 to 6 inches thick. 



Laminated blue and 3 



yellow clay, with white 



bands. 

 K, L. Naiadiia-bedB — fis- 2 



sile, thinly - bedded, 



cream-coloured lime- 

 stones. 

 I. Hard, dark, shelly (J 5 



limestone, weathering 



brown. 



H. Shaly parting 4 



O. Limestone like I ; ' beef" 5 to 8 



above and below. 



Salad ita lanceolata. etc. 



Pecten valoniensis (very abundant), 

 other fossils as in the first section. 



Avlcula contorta, Pecten valoniensis, 

 etc. 



(The shaly parting is in 



F.-II. Crumbly black 

 shales and clay, with 

 siliceous bands, con- 

 taining Cardium rhes- 

 iicum. 



I. Thin but constant 



ferruginous band. 



E. III. Black laminated 



clay. 



II. Ferruginous band. 



1. Black and green 



laminated clay. 



places absent, and G and I are then conjoined.) 



2 Avicula contorta, Pccten valoniensis, 

 Axinus cloacinus. A. concentricus. 

 A. depressus, A. elongatus, (!) Ana- 

 tina iSuessi. Cardium rhmtieum ; 

 Gyrolepis Alberrtii, Hybodus minor, 

 Sau rich thys acu min at us. 



Aoicula contorta, A. solitaria, Axinus 

 cloacinus, A. depressus, Cardium 

 rhceticum, Gervillia precursor 

 (young), (?) Anatina Suessi, Placu- 

 nopsis alpina. 



