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-crystalline 
limestone, layers seen in southern part .of the 
quarry. ‘Trenton. 17 oe 
D*® Dark colored to drab fine to medium grained 
with numerous crystals of calcite. Contains 
cRatimes@quina alternata (Con.). Hall and 
Clarke. 1/008 % 
D? Lumpy, dark blue, fine grained limestone 
with occasional small sparkling crystals of calcite. 
Colwmmapiavalycolata “Goldiuss, occurs 
im place at'the top of the northern part of the 
quarry, and at the base in the southern part. Black 
river. Bs oe 
Dt Dove colored to grayish blue, very , fine 
grained limestone with smooth fracture. No fos- 
sils. Birdseye. 2! 222! 
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 | | lie) 
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) 
11 Zygospira recurvirostra Hall - ! (c) 
