12 



from it very readily, and a closer inspection showed a dark green substance 

 overspreading the bed, seemingly the remains of vegetable matter only 

 partially decomposed. In fact, throughout this particular deposit small 

 stems and other traces of plants, generally in upright positions, were 

 observed, and their green and dull pink colours were still visible. The 

 stratum below the marl consisted of marlstone from six to seven feet in 

 thickness, various in its character, some portions being exceedingly hard 

 and others a soft shale, with numerous lumps of limestone imbedded in the 

 mass. In colour it resembled the beds of the Lower Lias. Fossils were 

 abundant, they were chiefly in layers varying from half an inch to three 

 inches in thickness. In excavating the rock the partings usually took 

 place in these shelly layers, shewing the surface of the slabs covered with 

 a multitude of stells and casts. In fact specimens of nearly the whole 

 of the fossils found in the entire deposit might be seen upon the surface 

 of one or two slabs. 



The following is a list of fossils procured from this deposit and the marl 

 bed overlying it, all of which, except where otherwise stated, were 

 abundant. 

 Ammonites capricornus, Schloth. Area (specimen undetermined) 



Henleyi, Sow. (single Avicula inoequivalvis. Sow. 



specimen) Pecten var. oequivalvis (?) Sow. 



Belemnites paxillosus, Schloth. Pinna nov. sp. like cuneata 



Modiola scalprum. Sow. (specimen undetermined) 



Gryphoea cymbium, Lamck. Pleuromya unioides. Mm. 



Cuculloea Miinsteri, Ziet. nov. sp. smooth 



Area elongata, Q,uenst. Unicardium cardioides, Phil. 



Cypricardia cucuUata, GoUf. Ehynchonella rimosa, v. Buck. 



. . (specimen undetermined) Terebratula (species undetermined, 



Cardium truncatum. Sow. one specimen only) 



The upper portion of the section commences at Stroudhill and extends 

 down to the river Trome at the foot of the town, shewing an elevation of 

 330 feet. The strata comprise three divisions, viz., the marlstone beds of 

 the Middle Lias, the Upper Lias marls and clays, and the Sands. 



The Marlstone series (exclusive of the last-mentioned bed) with the 

 intermediate beds of marl and sand occupied a depth of 38 feet, a shaft 

 sunk a few yards above the canal bridge at Stroud shewed the lower bed 

 resting on the Lias, which was there at the elevation of 144 feet, or, 35 

 feet higher than at the filtering tanks. The Lias attains this elevation 

 somewhat suddenly, following in this respect the inclination of the surface. 

 The excavation shewed the Marlstone to consist of three beds, each from 

 four to six feet thick, separated by beds of yellow marl and sand. The 

 thickness of the upper marl bed was about 6 feet, and of the lower about 15 



