jiOOEE AE>'01OIAL SECO>'DAKY DEPOSITS 



50 1 



ft. in. 





27. Marl 6 



38. 



28. Stone, with numeroxisLrma 



39. 



gigantea, Ostrca multi- 



40. 



costata, Lima tuberculata 7 





29. Marl 8 





30. Stone 7 



41. 



31. Marl, numerous Entomos- 



42. 



traca 8 



43. 



32. Stone 7 



44. 



33. Marl 2 



45. 



34. Stone 3 



46. 



35. Marl 4 



47. 



36. Stone 3 





37. Marl 3 





ft. in. 



Stone 5 



Marl 3 



Stone in thin laminae, with 

 Arnmonitcs jplanorhis and 



insects 7 



41. Laminated clay 1 3 



Stone 8 



43. Clay 2 



Stone 3 



Clay 4 



Stone 6 



Eubbly stone and clay to 

 top 3 



In the road imder the TTaterworks the variegated Maris of the 

 Keiiper are visible. Above, near the works, a trench had been cnt 

 across tlie ontcrop of the IVldte Lias with the Lasect and Crustacean 

 bed, Xo. 10, and the Ostrea-beds succeeding. On the top of this 

 were diifted blocks, in which were at once to be recognized Pecten 

 PoUiLv, and Lima tuherculata, characteristic bivalves of the Sutton 

 Stone, which I subsequently found in situ in bed Xo. 28 of the above 

 section. 



The bed Xo. 40 is made up of thin laminDe, dark-coloured within, 

 but weathering white from exposure. It is an Insect-limestone, 

 with crustacean remains, and contains Ammonites iDlanorhis. I felt 

 certain before examining this bed that it was the equivalent of the 

 '•' Black Rock,'"' Xo, 31, of the Ammonites-planorhis beds in Horni- 

 brook's Quarry, Beer Crowcombe (see p. 485, vol. xvii. Quart. Joum. 

 Geol. Soc), and that the bed of clay above, Xo. 49, was the " Hook- 

 stone Clay," Xo. 37, of the same section. The presence of Ammo- 

 nites planorliis at once confirmed this view. In the paper just quoted 

 I remarked on the extraordinary uniformity the Lower Lias presents 

 over veiy wide areas where uninterruptedly deposited, of which ex- 

 amples were then given ; but I did not expect to find illustrations of 

 this fact at Bedminster. However, on referring to the Beer section, 

 and reckoning the beds of the Lower Lias upwards above the lATiite 

 Lias in both places, the A. planorhis beds are Xo. 31 in both the sec- 

 tions ; and we therefore find beds that are forty miles apart in a direct 

 line, and separately of but a few inches in thickness, occupying the 

 same horizon, and though difi'ering from those both above and below, 

 of precisely the same lithological character, and with the same pecu- 

 liar organic remains. 



It is impossible to have a more striking contrast than is here 

 presented between the uniformity of succession from Bedminster 

 through the whole of the 'Ssc^i of England, and the unconformable 

 and abnormal conditions previously described, when the strata have 

 been deposited under other circumstances. 



All the Bedminster Lias is below the Ammonites-BucHandi series. 

 There is no doubt the lower beds in the above section will repay a 

 careful examination. In the marl Xo 31, 1 found Avicida decussata 

 and Discina Davidsonii, ^Moore, which will be shown to occur also 



