276 



J. F. BLAKE AND W. H. HTTDLESTON ON 



Section in Sturminster Railway -cutting. 



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No. 1. Yellow argillaceous sands, much mixed with soil 14 



No. 2. Blue marl and clay, with numerous small oysters 8 



No. 3. Calcareous sandstone, graduating downwards into 

 rubbly limestone bands with marly partings, con- 

 taining Ammonites plicatilis, Perna mytiloides, 

 Myacites securiformis, Astarte polymorpha 8 9 



No. 3 a. Light-blue marl, with light rubbly limestone 



concretions at the top 4 6 



No. 3 b. Rough limestone, shelly and hardened towards 

 the upper part, and having a thin bed of blue clay 

 below. This contains a few oolitic grains of all 

 sizes up to that of a pea. Trigonia clavellata, 

 Echinobrissus scutatus, Astarte aliena, Lucina, sp., 

 Exogyra nana 2 3 



No. 4. Rubbly limestone, discoloured except near the 

 base, where it is white and soft for 2 feet, with a 

 hardened band of 1 foot below. The fossils in this 

 bed, though very numerous, are much rolled and 

 rubbed, most, if not all, having been brought from 

 a distance, or subjected to cun*ents in the neigh- 

 bourhood. The most abundant is Cidaris florigem- 

 ma ; and there are besides Alaria Deshayesca, Pleu- 

 rotcmaria reticulata, Chcmnitzia heddingtonensis, 

 Nerinaa, sp., Natica dejanira, Phasianella Buvig- 

 nieri, Littorina muricata, Cerithium muricatum, 

 Sowerbya triangularis, Opis corallina, Perna myti- 

 loides, Lima subantiquata, L. elliptica, TJnicardium, 

 sp., Modiola, sp., Exogyra nana, Ostrea gregarea. 



Thickness 9 



No. 5. False-bedded shell limestone, of varying hardness, 

 and often quite soft, made up almost entirely of 

 fragments of shells, very few being of recognizable 

 completeness ; oolitic grains are also numerous. 

 The false-bedding is very regular, dipping east at an 

 angle of 16°, so that in the space of the cutting 

 more than 60 feet are seen as measured perpendi- 

 cular to the successive beds. As, however, they are 

 traced to the east, they are found to be gradually 

 becoming conformable to the beds above ; the two 

 uppermost beds, one of which is more compact, are 

 distinctly wedge-shaped, decreasing in the direction 

 of the false dip, which here has the same inclination 

 as the true dip of the overlying bed, from 4 feet to 

 almost nothing. The surface of this set of beds is 

 waterworn and irregular, with the overlying rubbly 

 beds in pockets. Phasianella, sp., Cerithium mu- 

 ricatum, Lima elliptica, Pseudodiadema radiattim. 



Thickness as a whole 15-18 



No. 6. Black and white rubbly marl, the whiter portions 

 in hard bands, the light upper, and dark central 

 parts very fossiliferous ; but all the fossils are email, 

 and appear to have been transported. Littorina 

 muricata, Turbo funiculatus, Cerithium muricatum, 

 C. inornatum, Ceritella, sp., Orthostoma, sp., Quen- 

 stedtia laevigata, Cypricardia glabra, Lima elliptica, 

 Pecten strictus, Exogyra nana, Echinobrissus scuta- 

 tus, Acrosalenia decorata, Hemicidaris intermedia. 



Thickness 8 



No. 6 a. Loose pisolite of large flattened concretions ... 1 

 No. 6 b. Oolitic marl with large grains, 3 feet seen. 



