Education Department Bulletin 



Published fortnightly by the University of the State of New York 



Entered as second-class matter June 24, 1908, at the Post Office at Albany, N. Y., under 



the act of July 16, 1894 



No. 468 



ALBANY, N. Y. 



April i, 1910 



New York State Museum 



John M. Clarke, Director 



Museum Bulletin 138 



GEOLOGY OF THE ELIZABETHTOWN 

 AND PORT HENRY QUADRANGLES 



BY 



JAMES F. KEMP Sc. D. 



AND 



RUDOLF RUEDEMANN Ph. D. 



PAGE 



Introduction 5 



Chapter i Introduction 7 



" 2 Physiography 11 



'* 3 General geology 21 



Grenville series 21 



Chapter 4 General geology {con- 



tinued) 25 



Metamorphosed eruptives 25 



Granites and related types 26 



Anorthosites 27 



Intermediate gabbros demon- 

 strably later than the anortho- 

 sites 37 



Syenite series 44 



Basic gabbros 52 



Unmetamorphosed basaltic 



dikes 57 



I'AGE 



Chapter 5 Paleozoic strata. . . 62 



" 6 Structural geology .. . 75 



Faults 75 



Chapter 7 Areal distribution 79 



" 8 Areal distribution and 

 general structure of 

 the Paleozoic forma- 

 tions 88 



" 9 Glacial and postglacial 



geology 92 



" 10 Economic geology... 96 



1 Iron ores 97 



2 Limestones 149 



3 Clay 152 



Chapter II Mineralogy 152 



Bibliography .... 162 



Index 167 



