Subject ASC0003z81
The geologist : a popular monthly magazine of geology.
v.4 (1861), (1861)
American Museum of Natural History Library
BHL Page 47659322
Keywords
Spongia ramosa mantell polypothecia clavellata benett cretaceous formation upper chalk fossil sponge Polypothecia claveliata Cretaceous Upper Chalk Polypothecia clavellata upper chalk sponge cross section geology