Subject ASC0003szl
The geological magazine, or, Monthly journal of geology.
Decade 2:v.10 (1883), Page 227 (1883)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32513360
Keywords
geology overlap overstep underlap understep rocks stratification layer strata rock band ground dirt layers Diagram Overlap Overstep Underlap Understep