of Devonian shale outcrop near Alfred, New York (probably Canadaway
Group, Machias Formation, Caneadea Shales) that provided the
base material for Devonian Shale: Aquifer I.
This outcrop was used in the early part of the 20th century
source of clay for the production of roof tiles and drainage
Devonian Period of the Paleozoic Era is from 350 - 400 million
the present. This period was characterized by the dominance
of fishes and the rise of amphibians.
Map of Pennsylvanian/Devonian stratigraphy surrounding Alfred,
York (center of the map).
Red area: Pottsville Group (50-100 ft., 15-30 m)
Dark Blue area: Conewango Group (450-650 ft., 140-200 m)
Green area: Conneaut Group (250-600 ft., 75-200 m)
Light Blue area: Canadaway Group 700-1200 ft., 210-370 m)
Pink area: Java Group (300-700 ft., 90-210 m)
Yellow areas: West Falls Group (1100-1600 ft., 340-490 m)