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116 GEOLOGY OF THE THIRD DISTRICT. 



The group appears under tlie whole range of quarries of the Onondaga limestone, forming 

 a cliff in which parts favorable for examination are exposed. The upper layers contain many 

 individuals of the strophomena of the group. 



Portions of the lower part of the group, and some of the upper, are favorably exposed in 

 the valley of Nine-mile creek, below Marcellus village ; and also along the outlet of Skane- 

 ateles lake, where water-limestone is quarried for enclosures, but not for burning. Good 

 specimens of the Antiqjie littorina are more numerous in that direction, than in any other 

 locality met with. 



There is an extensive exposition of the upper layers by the hill-side facing Auburn, com- 

 mencing at some distance to the east by north of the village. They arc quarried at the third 

 opening at Beck's quarry. Three layers being extracted, the upper one, which is immedi- 

 ately below the Oriskany sandstone, is rejected ; the two lower ones are burnt for lime. 



Another point is at the ledge to the north of the factory, by the side of the outlet. It forms 

 the cliff extending round towards Springport, and is favorably exposed in many points ; one 

 of which is on the road to Cayuga bridge at the descent of the ridge. The top shows some 

 portion of the Onondaga on the left, and the water Jime group on the right. This is one of 

 the localities of the Sulcated atrypa. 



Another favorable exposition is the quarry belonging to Mr. Yawger ? to the right of the 

 road fi-om Auburn to Springport. There the blue is burnt for lime, and good water-limestone 

 exists with it, which is not yet used. 



At Springport, it appears in the brook at the village, showing one of the layers of water- 

 lime. It is quarried at Blanding's and burnt for lime, at the side of the lake to the southwest 

 of the village, being the extreme quarry there opened. The group finally disappears under 

 the lake, at the point of land to the southwest of the quarry. 



