Bishop — (teology of Erie County. 



A large fragment of limestone of several tons weight and containing 

 numerous Hamilton fossils was noticed in Cayuga creek near Town Line. Tt 

 evidently had its origin in that vicinity, although the parent rock w as not 

 found. 



At Blossom is a four-foot layer of a limestone sufficiently durable for 

 bridge work. It contains the fossils common to the horizon of the Encrinal 

 limestone and Moscow shales, including an abundance of cyathophylloid corals. 

 Examination proved that it lies just above a well-marked Marcellus outcrop. 

 On. the west branch of Smoke creek, a mile below Windom, a hard calca- 

 reous shale, eighteen inches thick, occurs in the same relative position as the 

 preceding limestone. Another outcrop is seen where a little brook crosses the 

 Mile Strip road about 200 yards east of the Hamburg turnpike. The rock 

 here is a fairly good limestone. At Bay View the corresponding horizon is 

 represented by a soft calcareous shale about two feet thick, capping the cliff 

 a short distance south of the hotel. 



While by no means certain of the continuity of this calcareous stratum 

 throughout the county, in the absence of evidence to the contrary I have 

 provisionally assigned it to the horizon of the beds termed the "Basal lime- 

 stones" by Professor J. M. Clarke, and have used it as a basis of measurement 

 in determining the thickness of the Hamilton and Marcellus rocks. 



At Eighteen Mile creek, near Lake Erie, the Moscow and Genesee shales 

 have thinned out, leaving the Encrinal limestone near the top of the series. 



The rocks here above the Encrinal limestone are : 



Blue Moscow shale, resting on the Encrinal, . . 15 ft. 4 in. 

 A layer of iron pyrites \ to \ inch thick, 

 sometimes merely a stain of rust, believed to 

 represent the Tully limestone. 



Blue shale, 1 ft. 2 in. 



The " Styliola band," consisting here of 



(a) . Hard Calcareous shale, 3 in. 



(b) . Soft Shale, 2 in. 



(c) . Iron grey limestone, containing fish- 



plates and crinoid stems, . . . . 4 in. 



(d) . Firm iron grey limestone, composed 



largely of Styliola fissureUa, . 8 to 12 in. 1 ft. 9 in. 



Black shale, about 14 ft. in. 



Then follow twenty feet or more of olive-green shales with numerous 

 concretions, capped by black shale extending to the top of the gorge. 



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