GEOLOGY OF THE AUBURN-GENOA QUADRANGLES 1 3 



Manlius limestone is also exposed in the ravine in the rear of the 

 sanatorium in the village of Union Springs and in the old quarry near 

 the residence of Mr George Backus i mile north of the village from 

 which a large amount has b:en utilized in building inclosure walls 

 along the highway in the vicinity. The upper beds have been quarried 

 on the Yawger farm 3 miles northeast of Union Springs where they 

 are overlaid by 4 feet 6 Inches of Oriskany sandstone, and the forma- 

 tion outcrops half a mile farther north on a hill on the east side of 

 the highway leading to Crossroads. A quarry half a mile west of 

 the Lehigh Valley Railroad station in the city of Auburn shows 

 Manlius limestone at the bottom at the north end with Oriskany sand- 

 stone and Onondaga limestone above it. Nearly all of the large 

 quarries in the face of the rock escarpment that extends across the 

 northern part of the city are in the Manlius, with Oriskany at or 

 near the top of the section. The old Phelps quarry on the east side 

 of the highway 2 miles south of the village of Sennett displays the 

 formation finely and several abandoned quarries near the northeast 

 corner of the quadrangle afford most excellent opportunity for ex- 

 amination of the stratigraphy and the fauna of this the highest mem- 

 ber of the Siluric system on the Auburn quadrangle. 



Fossils are common throughout the formation and very abundant 

 in some parts. The number of species is quite limited, however, the 

 fauna in this locality, so far as observed, consisting of the following: 



Chaetetes (Monotrypella) arbuscu- Whitfieldella laevis (Vanuxem) 



lus Hall W. sulcata (Vanuxem) 



Stromatopora concentrica Conrad Holopea antiqua Vanuxem 



Schuchertella interstriata Hall Tentaculites sp. 



Spirifer vanuxemi Hall Leperditia alta Conrad 

 Stropheodonta varistriata {Conrad) 



DEVONIC 

 Oriskany sandstone 



The basal member of the Devonic system, interstratified between 

 the Manlius limestone and the Onondaga limestone in the central and 

 western parts of the State is an intermitting stratum or series of thin 

 lentils, of coarse pinkish or white sandstone or quartzite, or where 

 these are wanting, a thin mass of black bituminous mud with pebbles 

 of black sand or waterlime. At some outcrops these pebbles occur 

 embedded in the lower part of the heavy layer of limestone that suc- 

 ceed? this horizon. 



