Subject ASC0003tah
The geological magazine, or, Monthly journal of geology.
Decade 3:v.3 (1886), Page 22 (1886)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32502535
Keywords
natural size illustration sketch plant fossil graptolite shales Phyllograptus-shales Dichograptus rock cracks disk