Vol. 60.] 



SECTIONS IN THE BRISTOL DISTRICT. 



/ / 



(C) Cotham Road, Bristol. 



The next section to be described was exposed for a few days, in 

 cutting a channel in connection with the Oakfield Itoad "Waterworks. 

 It is interesting as passing Gotham House, where Edward Owen 

 first found Cotham Marble in 1754. Although incomplete above 

 and below, there are features that make it well worth recording. 

 I may say that, as more than a few feet of the section were never 

 exposed in one place, the measurements are rather approximate. 



Feet inches. 



Ostrea liassica, Pleuromya Crow- 



S. Hard blue limestone, 

 ■weathering yellowish- 

 brown. (Not found in 

 place.) 



N. Cotham Marble, poorly 

 developed. usually absent. 

 A few poor 'landscape- 

 stones.' Frequently re- 

 presented by concretions 

 (see p. 178). 



M. Yellow marl ! 



L, K. Hard, yellow, fissile o 

 limestone, like the Xaia- 

 dita-Beds at Redland. 

 Lower down, it becomes 

 very massive, not fissile, 

 with a grey homogeneous 

 core and yellow exterior. 

 Usually barren, but splits 

 along surfaces covered with 



There are also many 

 bands, about a quarter of 

 an inch thick, of brown, 

 very shelly limestone, 

 sometimes jointed into 

 tiny squares and polygons. 

 The shells are arranged 

 horizontally parallel one 

 to the other, in a way 

 very suggestive of Pur- 

 beck Marble. 



I. Thick, hard, shelly, nun- (J 

 jointed black limestone. 



combe ia, Mod tola minima. 



G 

 



Xaiadita lanceolata. 



Pecten valoniensis, Cardium cloaci- 

 num, Car din ia regular is, Modiola 

 minima; Acrodus minimus, Gyro- 

 lepis Albert ii, Saurichthys acumi- 

 natum ; coprolites. 



H, G. (Absent.) 



F, E. Crumbly black shales, 

 with pyritous flakes ; a 

 few thin siliceous bands. 



D. Hard, more thickly-bed- 

 ded, black 'Paper-Shales.' 



Bone-Bed (absent). 



Q.J.G.S. No. 238. 



4 to 6 Pecten valoniensis (very abundant), 

 Axinus cloacinus, A. concentricus, 

 A. depressus, Cardium rhceticum, 

 Modiola minima, Anomia valoni- 

 ensis, Mo not is sp., (?) Gcrvillia 

 ornata ; Natica Oppeli ; Gyrolepis- 

 scales. 



A vicula contorta (large and abundant), 

 A.solitaria, Pecten valoniensis (only 

 at the top), Axinus concentricus, A. 

 depressus, Cardium cloacinura, Myo- 

 phoria Emmricki (very perfect and 

 abundant), Modiola (!) minima, 

 Placunopsis alpina ; Gyrolepis 

 Albertii ; pyritous elytra of beetles. 



A few specimens of Avicula contorta 

 and Axinus. 



X 



