{2 NEW YORK STATE MUSEUM 
PERIODS, EPOCHS, AND ROCK FORMATIONS IN NEW YORK 
SAGs . 
Recent clay beds, alluvium ete. Surface deposits 
Quaternary~ Pleistocene. Glacial clay, sand, very common 
gravel, boulders etc. over the State 
Tertiary es Sands, clays, and gravels on Long Island 
Monmouth 
: Matawan Clay and sand on Long and Staten 
Cretacic Mapothy Telande 
Raritan 
Jurassic Absent (probably ) 
Newark sandstone and 
Palisade lava 
Permic Absent 
Triassic } Rockland county 
Carnene ‘; Olean conglomerate lee and Cattaraugus 
Cattaraugus shale counties , 
Catskill and Chemung | Catskills and southwestern 
sandstones J New York 
Portage shale and South-central and western 
) sandstones New York 
Genesee shale \ East-central to western New York 
Devonic Tully limestone 
Hamilton shale 
Marcellus shale East-central to western 
Onondaga limestone New York and eastern 
Oriskany sandstone base of Catskill mountains 
Helderberg limestone 
Manlius limestone 
Rondout waterlime Eastern to western New 
Cobleskill limestone York except Shawan- 
Salina shales, salt, water- gunk in eastern New 
lime and Shawangunk York only 
conglomerate 
Siluric Lockport and Guelph 
dolomites Central to western New York 
Rochester shale 
Clinton shale, sandstone, Central to western New 
limestone and iron ore York 
Medina and Oneida sand- Central to western New 
stone and conglomerate _ } York 
