334 Mr. Weaver's Geological Observations on 



predominating. Tliey are well exposed in Long's quarry ; where sulphate of 

 strontian frequently occurs, in the form of thin interrupted veins and layers, 

 or in disseminated portions. 



Beds of this description may be seen in the most southern quarry, reposing 

 conformably on the western side of the eastern trap ; and again, in the most 

 northern quarry, called Cullimore's, on the western side of the western trap, 

 dipping 2b° toward the west. The lowest bed in the latter quarry, reposing 

 upon the trap, is a conglomerate, composed of small fragments and rounded 

 portions of limestone, slate clay, and sandstone, with some trap-like matter 

 cemented by carbonate of lime ; above which the substances next in succes- 

 sion consist of thin beds of marly clay and sandstone in alternation, containing 

 numerous organic remains. These appearances, which occur near the middle 

 of the western side of the quarry, are in the north-western portion attended 

 by other circumstances (see Plate XXXIX. fig. 2.). Here, beneath the grass 

 land and loose soil, appear, 



1. The stratified beds just described, exposed to about four feet indepth ; 

 partly in a loose state, from disintegration. 



3. Mass of trap, three feet thick. 



3. A layer composed of sandstone, slate clay, carbonate of lime, oxide of 

 iron, and trap-like matter, intermixed, from four to six inches thick : this 

 being connected with the beds No. 1, the mass of trap No. 2. appears to be 

 inclosed between them, 



4. Trap, four feet thick. 



5. A layer, analogous to No. 3., but terminating in a fissure towards the 

 south. 



6. Continuous trap. 



The layers No. 3. and 5. contain numerous remains of caryophyllites, 

 favosites, astreites, bivalves, &c., and I found also the impression of a trilobite. 

 These layers are connected on the north with irregular fissures, which, 

 passing through the trap, converge, and terminate below. The fissures are 

 occupied chiefly by a conglomerate, compounded of trap, limestone and 

 sandstone, in which the trap predominates, containing organic remains, as- 

 sembled, as it were, in clusters. But in the continuous trap No. 6. no organic 

 remains are perceptible*. 



* One of the lowest of the stratified beds (described above under No. 1.) consists of gray horn- 

 stone, containing, like the rest of the beds, organic substances ; and a similar bed appears adja- 

 cent to the trap at Horsley quarry (§ 11.), An advocate for the igneous origin of trap might 

 possibly from these circumstances infer, that sandstone has been here consolidated and converted 



