J. F. Walker — Ltassic Sections near Bridport. 441 



(1) Unfossiliferous sandstone, about 



(2) Top band of white stone 



(3) Brown stone 



(4) Brown conglomerate often with pink stone at the base 



(5) Marlstone 



(6) Blue unfossiliferous limestone ... 



The above may be regarded as the average thickness of the bed. 



The blue limestone, which the workman said was the base of the 

 rook, was coated on its lower surface with calcite, and rested on sand. 



The Marlstone was of the usual brown colour, becoming yellow 

 and more friable in some blocks, but towards its upper part was 

 redder, and appeared in many blocks to gradually pass into the pink 

 limestone which generally occurred at the base of the conglomerate; 

 the pink rock appeared to have been slowly deposited on the surface 

 of the marlstone. 



The Conglomerate bed varied in colour, being mostly brown, 

 differing from the marlstone in being harder and of a lighter colour ; 

 in some parts it had a greenish tint ; its lower part was a pink rock 

 with Oolitic grains, in the upper part it contained nodules, and some 

 of the blocks were perforated by boring shells. Above this was 

 a light brown stone which joined the hard cream-coloured stone. 

 The top bed was an unfossiliferous sandstone which reached the 

 surface of the road. 



The fossils, especially the Brachiopoda, were carefully collected 

 by breaking the blocks ; after a few days' work we were able 

 to sort the blocks, and to tell what species they would contain. 

 No specimens of Vertebrata wei-e obtained. Many specimens of 

 Gasteropoda were found, but owing to the hardness of the rock it 

 vi^as impossible to extract them entire. It also contained several 

 species of Pecten, Lima, etc. 



The Marlstone contained in its lower pai't : 



Spiriferina rostrata. 

 Ehynchonella tetrahedra, Sow. 



egretta'? E. Desl. 

 I'erebratula punctata, Sow. 



sp. {T. Jauberti)? E. Desl. 



JEdwardsii, Dav. 



Waldheimia [Aulaeothyris) restipinata, 

 Sow. 



[Aulacothyris] Bloorei, Desl. 



[Zeilleria) indentata, var. 



Sow. 



■Zeilleria), sp. 

 suhnumismalis, Dav. 



Along with Ammonites (Amnltlieus) spinatus. 



In the upper part of the Marlstone Bhychonella serrata, Sow. 



Bemarks. — It will be noticed that Rhyn. serrata occurs in the 

 upper part of the Marlstone. It is stated by Mr. C. Moore to 

 occupy the same position near Ilminster ; this species, generally a 

 rare fossil, was very abundant. I obtained nearly 200 specimens, 

 more or less perfect, in a bed about three inches thick. It will be 

 remembered that the area of the pit was about seventeen square yards. 

 Some varieties of Rhijn. serrata show that it is related to Rhyn. 

 quinque/plicata, Quenstedt. 



Bhynchonella tetrahedra was not common, and was a fine ribbed 

 variety. 



Rhynchonella egretta ? This species is refen-ed by Davidson in 



