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NEW YORK STATE MUSEUM 



8 No. 143 Gypsum Deposits of New York. By D. H. New- 

 land and Henry Leighton. 94p. 2opl. 4 maps. 



Contents: 



Introduction 



History of the gypsum industry in 

 New York 



Composition and characters of gyp- 

 sum 



Uses of gypsum 



General geology 



Details of the distribution of I 

 gypsum in New York 



Character of the gypsum in New | 



York; chemical analyses 



Permanence of the gypsum supply 



Methods of prospecting and ex- 

 ploiting the gypsum deposits 



Origin of gypsum 



Properties of gypsum and theory 

 of its transformation to plasters 



Technology of gypsum plasters 



Bibliography 



Index 



9 No. 145 Geology of the Thousand Islands Region. By H. P. 

 Cushing, H. L. Fairchild, Rudolf Ruedemann and C. H. Smyth, 

 Jr. 1949. 62p. 6 (5 colored) maps. 



Contents: 

 Introduction 

 Location and character 

 Summary of geologic history 

 Igneous intrusions 

 Close of the long period of ero- 

 sion 

 ' Paleozoic sediments 

 Subsequent history of the region 

 The Pleistocene 

 The rocks 



Precambric rocks 

 Great Precambric erosion 

 Paleozoic rocks 

 Precambric surface underneath 



the Potsdam 

 Potsdam sandstone 

 Theresa and Tribes Hill forma- 

 tions 

 Pamelia formation 

 Mohawkian series 

 Summary of Paleozoic oscillations 

 of level 

 Dip of the Paleozoic rocks 

 Rock structures 

 Foliation 

 Joints 

 Folds 

 Faults 

 Topography 



Paleozoic altitude and climate 



Amount of erosion 



Original drainage 



Tertiary uplift 



Tertiary drainage 



Plateaus, terraces, scarps 



Lakes 



Underground drainage 

 Pleistocene geology 



History 



Physiography 



Glacial deposits 



Glacio-aqueous deposits 



Glacial erosion 



Prewisconsin glaciation 

 Economic geology 



Road metal 



Granite quarries 



Sandstone quarries 



Limestone quarries 

 Petrography of some Precambric 

 rocks 



Bleached granite 



Picton granite 



Alexandria syenite 

 Granitized amphibolite and amphi- 

 bolized granite (soaked rocks) 

 Index 



