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University of the State of New York, 



New York State Museum 



Frederick J. H. Merrill Director 

 Bulletin 48 December 1901 



PLEISTOCENE GEOLOGY 



OF PORTIONS OF 



NASSAU COUNTY AND BOROUGH OF QUEENS 



BY JAY BACKUS WOODWiiBSa-fi* 



AMERICAN ITHK^WO^Y. 



PAGE 



Preface 617 



Introduction 618 



Topography 618 



Geology 621 



Pre-Pleistocene formations 621 



Glacial formations 623 



Harlem and Brooklyn quadran- 

 gles 648 



Jamaica bay depression 650 



Glaciated ledges 652 



Port Washington glacial lake. .. 653 



College Point delta 657 



Summary of glacial history 660 



Post-glacial changes and pro- 

 cesses now in action 661 



Bibliography 664 



Glossary 664 



PAGE 



Index 669 



Plates 



1 Map of the Pleistocene geology 

 of the Oyster Bay and Hemp- 

 stead quadrangles on Long 

 Island Cover page 3 



FACING PAGE 



2-5 Views of boulder bed King's pit, 



Hempstead harbor, 627, 629,631, 633 



6 Sand washer at King's pit 635 



7 Reed & Murray's sand pit. Port 



Washington, glacial delta 647 



8 Eastern sand pit. Port Wash- 



ington . -- 655 



9 Sketch map showing position of 



retreating ice front at the Port 

 Washington stage 659 



ALBANY 



iqatTI 



UNIVERSITY OF THE STATE OF NEW YORK 

 1901 



M87ni-Jei-i5oo 



Price 25 cents 



