436 NEW YORK STATE MUSEUM 
reservoir, but above the pond thin, black, fine grained to coarse 
grained, richly fossiliferous layers of Trenton limestone are again 
exposed in the bed of the creek. The fossils Trinucleus 
concentricus Eaton, Monticulipora (Prasopora) 
lycoperdon Say and Rafinesquina. alternata 
(Con.) Hall and Clarke are specially abundant. These layers 
belong to the very top of the Trenton substage and are typical of 
it. Opposite the northwestern part of Rockton the rock again dis- 
appears and is not exposed again till the Amsterdam water supply 
pipe-line is reached. Along this line are loose pieces of rock which 
were thrown out of the trench during the excavation and show 
by their sharp angles that they were blasted from rock in place. 
Near where the pipe-line crosses the Fulton-Montgomery county 
line is a small exposure of very fine grained, dove limestone con- 
taining bivalve crustacea, and of slightly coarser grained similar 
limestone containing corals (Streptelasma). This rock, there- 
fore, belongs to the Birdseye and probably Black river substages. 
Fragments of similar rock occur along the pipe-line to near the 
branch of Chuctanunda creek northwest of Hagaman. Heavy 
bedded arenaceous limestone is exposed in the bed of this creek. 
Northwest of Hagaman and just north of the Fulton-Montgomery 
county line is a farm house standing well back from the road, and 
known as the “Old Bunn place.” The rock here is for the most 
part typical Calciferous but some of the upper layers are of a rather 
peculiar character. On fresh fracture they closely resemble Birds- 
eye limestone, but the weathered surface shows knobs and reticula- 
tions composed of arenaceous material weathered dull yellow. The 
matrix weathers nearly white. Similar rock clearly referable by its 
stratigraphic position in connection with its lithologic characters to 
the fucoidal member of the Calciferous stage may be seen below the 
quarry back of Crane’s village,! in the ledges along the West Shore 
railroad opposite Crane’s village and in the river bank below the 
Amsterdam depot and at Pattersonville. 
Along the valley of the Chuctanunda between Sanford’s mill and 
Rockton are several fine exposures of the Trenton stage. In the 
small gorge below the large pond east of Sanford’s there is. an 
‘This place is called Cranesville on the U. S. geological survey Amsterdam topo- 
graphic sheet but is known locally as Crane’s village and is so on the N. Y. C. & 
H. R. railroad time cards. 
