8 NEW YORK STyVTE MUSEUM 



Gabbro stocks and dikes of the usual Adirondack sort are promi- 

 nently developed in the southwestern half of the quadrangle, each 

 of two of the stocks occupying several square miles. 



Pegmatite and diabase dikes of the usual kinds, both later than 

 the gabbro, are well represented. A few small dikes of aplite 

 were also observed cutting the gabbro. 



Two small areas of Paleozoic strata are known in and near 

 Schroon Lalke village. One of these is Potsdam sandstone and the 

 other is Little Falls (?) dolomite. 



Fifteen faults and zones of excessive jointing have been located 

 and these have notably influenced the topographic development. 



Pleistocene deposits are ver}- widespread, being especially thick 

 in the mqre prominent valleys where the underlying rocks are in 

 many places effectually concealed by them. 



The following list includes the principal publications which con- 

 tain statements regarding the Schroon Lake quadrangle itself and 

 the adjoining districts, as well as certain other papers which aid in 

 understanding the geologic features of the quadrangle : 



1842 Emmons, E. Geology of the Second District. Pt 2 of The Geology 



of New York 

 1879 Hall, C. E. Laurentian Magnetic Iron Ore Deposits of Northern 



New York. N. Y. State Mus. Rep't 32, 1879, p. 133-40 

 1895 Kemp, J. F. Preliminary Report on the Geology of Essex County. 



15th Annual Rep't N. Y. State G'eol., p. 590-604 

 1897 Kemp, J. F. & Newland, D. H. Preliminary Report on the Geology 



of Washington, Warren, and Parts .of Essex and Hamilton Coun- 

 ties. 17th Annual Rep't N. Y. State Geo!., p. 547-48 

 1897 Kemp, J. F. Physiography of the Eastern Adirondack Region in 



the Cambrian and Ordovician Periods. Geol. Soc. Amer. Bui. 8, 



p. 408-12 

 1902 Finlay, G. I. Preliiminary Report of 'Field Work in the Town of 



Minerva, Essex County. 20th Annual Rep't N. Y. State Geo!., 



p. Tg6-io2. 

 1905 Gushing, H. P. Geology of the Northern Adirondack Region. 



N. Y. State Mus. Bui. 95 



1905 Ogilvie, I. H. Geology of the Paradox Lake Quadrangle. N. Y. 



State Mus. Bui. 96 



1906 Kemp, J. F. The Physiography of the Adirondacks. The Popular 



Science Monthly, March 1906 

 r9ia Kemp, J. F. & Ruedemann, R. Geology of the Elizabethtown and 

 Port Henry Quadrangles. N. Y. State Mus. Bui. 138 



1912 Miller, W. J. Early Paleozoic Physiography of the Southern Adi- 



rondacks. N. Y. State Mus. Bui. 164, p. 80-94 



1913 Miller, W. J. The Geological History of New York State. N. Y. 



State ]\Ius. Bui. 168 

 '914 Miller, W. J. Magmatic Dififerentiation and Assimilation in the 

 Adirondack Region. Geol. Soc. Amer. Bui. 25, p. 243-61 



