CONTENTS 



PAGE. 



General classification and arrangement 7, 8 



Geological position and geographical distribution 9-24 



I. Crystalline rocks 9-14 



1. Granites, syenites, gneisses and mica schist 9-12 



2. Trap-rock 13 



3. Marbles 13, 14 



II. Sub-crystalline and fragmental rocks 14-24 



1. Sandstones and quartzytes 14-19 



Potsdam Sandstone 15 



Hudson River Group 15-16 



Medina Sandstone 16 



Clinton Group 16, 17 



Oriskany Sandstone 17 



Hamilton and Portage Groups 17, 18 



Chemung Sandstone _ 18 



Catskill Sandstone 18, 19 



New Red Sandstone 19 



2. Limestones 20-22 



Calciferous Sandrock 20, 21 



Chazy Limestone 21 



Niagara Limestone 21 



Lower Helderberg Group 22 



Upper Helderberg Group 22 



3. Slates 22-24 



Quaternary formations . - 24 



Descriptive notes of quarry districts and quarries 25-143 



I. Crystalline rocks 25-44 



Granites, syenites, gneisses, mica schist 25-36 



Marbles 36-44 



