lO NEW YORK STATE MUSEUM 



The old O'Conner quarry, 2 miles north of Union Springs, on the 

 east side of the Cayuga road, shows 4 feet 8 inches of Cobleskill with 

 6 feet of Bertie below it and the exposure extends several rods north 

 over the remarkable conical uplifts hereinafter further described. 

 The cap layer of the old Wooley quarry on the east side of the road 

 I mile south of Crossroads is Cobleskill limestone and it appears at the 

 top of the railroad cut 40 rods east of the station at Crossroads. 



At the old Thompson quarries near the four corners i^ miles 

 north of Crossroads there are several old gypsum pits in which there 

 are small exposures of Bertie waterlime and the Cobleskill outcrops 

 slightly at the roadside 60 yards north of the corners with Bertie be- 

 low, and it is to be seen in place 125 yards farther west and there 

 are many loose fragments of the more fossiliferous layer near by. 



The largest exposure and the one most favorable for examination of 

 the strata and collection of the fossils of this formation on these quad- 

 rangles is ^ mile southeast of Aurelius station on the New York Cen- 

 tral Railroad where an outcropping ledge extends many rods north and 

 south of the road to Aurelius, in which there is an old quarry and the 

 upheaval of a row of rock cones, similar to those previously men- 

 tioned as occurring at the O'Conner quarry, has broken and dis- 

 turbed the heavy layers in an unusual and very striking manner. 

 Two small outliers or rocdrumlins of Cobleskill are located a mile 

 farther north. The New York Central Railroad cuts through the 

 north end of a drumlin i^ miles northeast of Aurelius station, and 

 another a mile farther east. The surface contour of the Cobleskill 

 may conform to the shape of these hills but the rock does not appear 

 on the surface. 



At the foot of the hill next east of the crossing of the road leading 

 north from the village of Aurelius and the New York Central Rail- 

 road, a small quarry on the south side of the railroad shows 4 feet 8 

 inches of Cobleskill at the base of the section and a few feet of 

 Rondout waterlime above it. Manlius and Onondaga limestone out- 

 crop 60 to 80 feet higher at the crest of the hill. 



This formation is covered by drift in the region north of Auburn, 

 except possibly a small outcrop by the side of the Lehigh Valley 

 Railroad a mile south of Throop, but it is fairly exposed 8 rods north- 

 west of the Sennett station of the New York Central Railroad and a 

 ledge of the Cobleskill limestone crosses the little brook west of the 

 station 10 rods south of the railroad. 



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