Subject ASC0003sqg
The geological magazine, or, Monthly journal of geology.
Decade 2:v.5 (1878), Page 271 (1878)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32727864
Keywords
geography layer tilt strata mohawk helderberg mountain catskill hudson river clinton shale niagara limestone lower upper devonian middle america usa united states new england new york