86 



NEW YORK STATE MUSEUM 



Ch. 6 The Rondout valley sec- 

 tion 



7 The Wallkill valley sec- 



tion 



8 Ancient Moodna valley 



9 Rock condition of Foun- 



dry brook 



10 Geology of Sprout brook 



11 Structure of Peekskill 



creek valley 



12 Croton lake crossing 



13 Geology of the Kensico 



_ dam site 



14 Stone of the Kensico 



quarries 



15 The Bryn Mawr siphon 



16 A study of shaft 13 and 



vicinity on the New 

 Croton aqueduct 



17 Geological conditions af- 



fecting the location of 

 delivery conduits in 

 New York city 



18 Areal and structural 



geology south of 59th 

 street 



19 Special exploration 



zones 

 20 The general question of 

 postglacial faulting 

 Index 



3 No. 148 Geology of the Poughkeepsie Quadrangle. By C. E. 

 Gordon. I22p. 26pl. i map. 



Contents: 



Introduction 



Location and other general fea- 

 tures of the quadrangle 



Topography 



Drainage 



General geology 



Previous geologic work 



Stratigraphical table 



The Precambric gneisses 



The Hortontown basic eruptive 

 and associated metomorphic 

 rocks 



The basal quartzitc (Poughquag) 



The Wappinger (Barnegate) lime- 

 stone 



The Wappinger creek belt 

 The Fishkill limestone 

 The " Hudson River " slate group 

 Preglacial history of the drainage 

 Glacial geology 

 Retreat of the ice sheet 

 Postglacial erosion 

 The present depiession 

 Other drainage features and ad- 

 justments 

 Land forms 

 Economic geolog}^ 

 Bibliography 

 Index 



4 No. 151 The Mining and Quarry Industry of New York. By 

 D. H. Newland. 82p. 



Contents: 

 Introduction 



Mineral production of New York 

 Cement 

 Clay 



Production of clay materials 



Alanufacture of building brick 



Other clay materials 



Pottery 



Crude clay 



Emery 

 Feldspar 

 Garnet 

 Graphite 

 Gypsuiu 

 Iron ore 

 Millstones 

 ]\Iineral waters 



