N!-\v TORE BTATK MUSEUM 



to Oadj Bound Tufa formfl in exposed situations along the 



in in the town of Riga on the land of Mr Knowley, a de- 



t mar] of unknown depth covers 30 or 40 acres. It lias 



trated 10 or 15 feet without Ending bottom. The 



Qpp lb v.-ry pure but the l«»\vcr part is sandy. 



The marl has been used for enriching soils, with very good 

 .lis at, several points in the county. 



Montgomery county 1 



Good exposures of the Calciferous occur near the New York 



atral railroad at Amsterdam and St Johnsville, Canajoharie 

 and TribeshilL 



According to Darton the Trenton limestone reaches its maxi- 

 mum thickness at Fort Plain, where it is 9 feet, but decreases to 

 7 feet at St Johnsville. The limestone varies sometimes, being 

 massive at Tribeshill, and at other places shaly. In the Tribes- 

 hill quarries 12 to 15 feet of massive stone is exposed. Other 

 exposures are Been in the quarries north of Amsterdam. 



At D. 0. Hewitt's quarry, 1 mile north of Amsterdam, the 

 Trenton rock has been used for lime. In the upper quarry the 

 stone is coarse grained, and the layers in upper portion of the 

 quarry are quite impure and shaly. The rock from this upper 

 quarry burns to a brown lime. In the lower quarry, which ia 

 just below Hewitt's limekiln, the stone is much purer and more 



wive than that of the upper quarry. The lower layers are 



hai - Light gray and are said to make a whiter lime. Under 



tin- 1 a bed of lime rock which is practically non-slaking 



have hydraulic properties. The lime made at this 



i ]).:• n. N. ii. Preliminary description of the faulted region of Herkimer, 

 Wton, M. • y and Saratoga counties (.see 14th an. rep't X. Y. state 



geol. p. 33) 



of Mohawk valley in Herkimer, Fulton, Montgomery and 



»c< 47th an. repM N. Y. Btate mus. p. GU3) 

 aer. Geol. 3d diet. X. Y. 1842. 



