7i 



pelecypods, gastropods, cephalopods, and trilobites, a sco- 

 re or more of species having been identified; and (C) an 

 exposed thickness of 12 feet of alternating thin limestone 

 bands and red shale, the limestone layers bearing upon their 

 weathered surface an even greater assemblage of fossils 

 than were mentioned for the middle member, over fifty 

 species having been identified, as follows: 5 corals, I cri- 

 noid, 17 bryozoans, 8 brachiopods, 8 gastropods, 3 cepha- 

 lopods, 9 ostracods, and 3 trilobites. The interlaminated 

 shale crumbles readily and specimens of corals, brachio- 

 pods, and bryozoans can be picked up from its weathered 

 slopes. The detailed section of the beds in descending 

 order is as follows: 



Mantle rock. — Glacial till, consis- 

 ting of sand, gravel, and boulders, 

 local and "foreign", with some 

 clay and surface layer of soil. 2 



5 



inches to 5 feet, 

 to 15-2 cm. 



1. Limestone. — Hard, white in co- 

 lour, showing few or no fossils. 

 In some places this has been strip 

 ped from the top of the quarry. . 24 inches, 61 cm. 



2. Limestone. — Hard, white in co- 

 lour, breaks into 5 or 6 layers 

 of irregular thickness. Surface 

 may weather porous. Fossils 

 not evident 14 • 5 inches, 37 cm. 



3. Limestone. — Rusty, yellow, joint 

 faces. No fossils 32 inches, 81 cm. 



4. Limestone. — -Compact, yellow, 

 often shows coarse porous struc- 

 ture 40 inches, 102 cm. 



*5. Limestone. — Yellow, with po- 

 rous bands near top and bottom. 59 inches, 150 cm. 



* Beds 2 to 5 constitute the quarries as they are usually worked. Fossils are not 

 entirely absent, but the perfection with which the fossil is merged in the rock and the 

 uniformity of both in texture and composition renders it difficult to detect them. 

 In rare cases they are exposed by weathering in the quarries, the most striking 

 of these fossils being the Beatriceas, which attain a diameter of four inches and a len- 

 gth of a foot or more. 



