LOWER SILURIAN SYSTEM OF EASTERN MONTGOMERY CO. 447 



East and north of this quarry the Trenton is exposed in the road 

 toward Glenville. One half mile east of the Schenectady-Mont- 

 gomery county line, some distance north of the highway between 

 Glenville and Crane's village, is a quarry formerly extensively 

 worked but now almost abandoned. A section was measured here 

 with the following results (2D): 



D^ Coarse grained, dark blue, semi-crystalHne 

 limestone, layers seen in southern part of the 

 quarry. Trenton. i'=7' 8" 



D^ Dark colored to drab fine to medium grained 

 with numerous crystals of calcite. Contains 

 Rafinesquina alternata (Con.) Hall and 

 Clarke. i'=6' 8" 



D^ Lumpy^ dark blue, fine grained limestone 

 with occasional small sparkling crystals of calcite. 

 Columnaria alveolata Goldfuss, occurs 

 in place at the top of the northern part of the 

 quarry, and at the base in the southern part. Black 

 river. 3J'=5'8" 



D^ Dove colored to grayish blue, very fine 

 grained limestone with smooth fracture. No fos- 

 sils. Birdseye. 2' 2^'=2.^ 2." 



The Calciferous sandrock is not reached in this quarry, so that 

 the 2' 2" of Birdseye does not represent the whole of that formation. 

 This is the farthest north of any clear section of the lower portion 

 of the Trenton. The following species were collected in about an 

 hour's search from the Black river limestone. No. 2. 



1 Columnaria alveolata Goldfuss (c) 



2 Streptelasma sp. (c) 



3 Monticulipora (Prasopora) lycoperdon Say (r) 



4 Stictopora cf. acuta Hall (r) 



5 Stictopora elegantula Hall (r) 



6 Stictopora cf. ramosa Hall (c) 



7 Leperditia fabulites Con. (c) 



8 Asaphus platycephalus Stokes (r) 



9 Ceraurus pleurexanthemus Green (rr) 



10 Rhynchotrema capax (Con.) Hall and Clarke (r) 



1 1 Zygospira recurvirostra Hall (c) 



