CONTENTS 



Geology of tlae area rl43 



Succession of the formations rl44 



Pre-Cambrian rocks rl44 



Poughqiiag quartzite (Cambrian) rl45 



Stockbridge and Barnegat limestones (Cambro-Ordovician) . . rl46 



Hudson shales and schists (Ordovician) rl47 



Green Pond conglomerate (Upper Silurian) rl47 



Pine Hill quartzite (Upper Silurian) rl47 



Longwood red shales (Upper Silurian) rl4$ 



Cornwall limestones (Upper Silurian) rl48 



Newfoundland quartzite (Devonian) rl4S 



Monroe shales (Devonian) rl4S 



Bellvale flags (Devonian) rl4£ 



Schunemunk conglomerate (Devonian) rl41 



Newark beds (Jura-Trias) rl4£ 



Igneous rocks (intrusive in the above) rl4^ 



Quarry industry of the area rloC 



Previous publications rl5( 



Granite: including gneiss, diorite, trap, etc rl51 



Lower pre-Cambrian gneisses rl5J 



Fordham gneiss rlo^ 



Yonkers gneiss rlot 



Granites and allied rocks in small areas rl6: 



Harrison diorite vlGl 



Cortlandt series: gabbros and diorites rl6( 



Newark diabase rlGI 



Sandstones: including shales rl6' 



Poughquag quartzite rl6 ' 



Hudson shales and sandstones rl6i 



Green Pond conglomerate rl6{ 



Pine Hill quartzite rl6{ 



Longwood red shales rl6J 



Bellvale flags rl6! 



Newark sandstone rl6l 



Limestones: including marbles rl61 



Cambro-Silurian (?) limestone of the Highlands rl6! 



Stockbridge and Barnegat limestones rl6! 



Newark limestone conglomerate rl7' 



