[Annals N. Y. Acad. Sci., Vol. XXIII, pp. 193-260, Pis. VIII-XV.    30 April,
1914]
 

THE JVIANHATTAN SCHIST OF SOUTHEASTERN NEW YORK
STATE AND ITS ASSOCIATED IGNEOUS ROCKS '

By Charles Reinhard Fettke

(Presented by title before the Academy, 1 December, 191S)

CONTENTS

Page

Introduction...........................................................  194

Historical review......................................................  197

Manhattan Schist...................................................... 202

Areal distribution................................................. 202

Petrology.........................................................  203

Structural features................................................ 211

Chemical composition..............................................  212

Origin............................................................ 213

Associated igneous rocks............................................... 216

Foliated basic intrusives........................................... 216

Hornblende schist............................................. 216

Actinolite and tremolite schists and associated types............ 219

Harrison granodiorite gneiss................................... 220

Origin of hornblende schist and granodiorite gneiss.............. 224

Massive basic intrusives...........................................227

Cortlandt series............................................... 227

Croton Falls hornblendite...................................... 228

Diorite dikes in the vicinity of Bedford.........................  231

Serpentine....................'................................ 232

Hornblende porphyrite......................................... 233

Acidic intrusives..................................................  234

Thomaston granite............................................ 234

Aplites and pegmatites......................................... 235

Bedford "augen" gneiss........................................ 239

Occurrence of zeolites in Manhattan schist.....................    243

Summary............................................................. 244

Peekskill phyllite...................................................... 245

Poughquag-Wappinger-Hudson River series.............................. 246

Poughquag quartzite............................................... 247

Wappinger limestone.............................................. 247

Hudson River slates, phyllites and schists........................... 248

Histoi'ical geology.................................................  252

Comparison    of    In wood-Manhattan    and    Poughquag-Wappinger-Hudson

River series........................................■................. 254

Bibliography  ......................................................... 2.^8
 

•Manuscript received by the Editor, 1 December, 1913.                               (193)