186 



Report of the State Geologist. 



XXI W at the summit of the hill southeast of Noblesville, and 510 feet above 

 the hotel in Laurens, four miles to the southeast in the valley of Otego creek. 



To the north of Noblesville are occasional exposures of rather coarse, 

 arenaceous shales in which Hamilton fossils are not uncommon. Atirypa 

 reticularis (Linne), Dal., is one of the most common species. The shales 

 with this species are exposed near the three corners, one and one-half miles 

 northeast of Noblesville (XXIV I) 7 ), and still better shown in the ledges 

 along the hillside in the northern part of school district No. 8. In the coarse 

 arenaceous shales of XXIV I) 7 there was little opportunity for collecting, 

 and only the three following species were noted : 



1. Atr iftxi reticularis (Linne), Dal. (c) 



2. Productella, sp. (r) 



A large species similar to the one found at XXIV D 4 , N. E. of 

 Gilbert's lake. 



3. JPhacops rana (Green), Hall. 



Hamilton ledges with characteristic fossils are well shown on the steep 

 hillside above the corners, about one and one-quarter miles south of Garratts- 

 ville. To the northeast of the locality just mentioned and east of Garratts- 

 ville is a steep hill, the top of which may be capped by rocks belonging to the 

 Sherburne formation. By the highway on the eastern side of the hill and 

 about north of New Lisbon Centre are coarse, arenaceous Hamilton shales, 

 which show glacial striae running S. 50° W. 



Near the top of the hill to the northeast a loose piece of stone was found 

 in the field in which RhyncliOTiella (JHypothyris) venustula, Hall, is common. 

 In the same block was an internal impression of Spirifer mucrmiatus (Con.), 

 Bill., and a CJwnetes, sp. This block probably came from the same horizon 

 as the one east of Noblesville in w hich the JtJiyncltoiiellas w ere found in place, 

 and this indicates the extension of that horizon to the northeastward on the 

 high hill in the northern part of New Lisbon. The top of the hill is so 

 thoroughly covered by drift that exposures of the bed rock are rare; but the 

 larger part of the loose pieces are apparently from the Hamilton formation 

 mixed w ith unfossiliferous pieces, possibly from the Sherburne beds. 



XX/ A\ To the northeast of Garrattsville a road climbs the steep hill 

 east of Butternut creek, the summit of which is two miles from the village, 

 giving a section of nearly 500 feet of Hamilton rocks. About one and one- 

 half miles N. E. of Garrattsville and 335 feet above the Level of Butternut 

 creek are conspicuous ledges of bluish and iron-stained blocky shales that con- 

 tain plenty of characteristic Hamilton fossils. One hundred and twenty feet 



