60 NEW YORK STATE MUSEUM 



The Mohegan Granite Co. continued work in its quarries near 

 Peekskill, from which are obtained yellow and light gray granites 

 adapted to building and monumental work. 



H. S. Kerbaugh Co., Inc., operated the Valhalla quarries in the 

 Yonkers granite. This is the largest enterprise in the State, most 

 of the product being used locally in engineering work, although 

 some of the output was sold. The stone is well suited for general 

 building purposes. 



LIMESTONE 



The stone classified under the heading of limestone consists for 

 the most part of the common grades of limestone and dolomite, 

 such as are characterized by a compact granular or finely crystal- 

 line texture and are lacking in ornamental qualities. 



A smaller part is represented by crystalline limestone and by the 

 waste products of marble quarrying which are sometimes employed 

 for crushed stone, lime-making or flux. Limestone used for the 

 manufacture of portland and natural cement is, however, excluded 

 from the tabulations so as to avoid any duplications of the 

 statistics. 



Limestones have a wide distribution in the State, the only region 

 which is not well -supplied being the southern part where the pre- 

 vailing formations are sandstones of Devonic age. The micro- 

 crystalline varieties occur in regular stratified order in the Cambric, 

 Lower Siluric, Upper Siluric and Devonic systems. In most sec- 

 tions they occupy considerable belts and have been little disturbed 

 from their original horizontal position. On the borders of the 

 Adirondacks and in the metamorphosed Hudson river region, how- 

 ever, they have been more or less broken up by faulting and erosion 

 and in places have a very patchy distribution. 



The Cambric limestones are found in isolated areas on the east, 

 south and west of the Adirondacks. They are usually impure, 

 representing a transition phase between the Potsdam sandstones 

 below and the high calcium limestones above. The lower beds of 

 the Beekmantown formation as originally defined are now known to 

 belong to the Cambric system. The Little Falls dolomite is per- 

 haps the most prominent member of the Cambric limestones and is 

 extensively developed in the Mohawk valley with quarries at Little 

 Falls, Amsterdam, and other places. It is a rather heavily bedded 

 stone of grayish, color, suitable more especially for building pur- 

 poses. In Saratoga county the Hoyt limestone is in part the 

 equivalent of the Little Falls dolomite ; it has been quarried for 



