Subject ASC0003ieh
The geologist : a popular monthly magazine of geology.
v.6 (1863), (1863)
American Museum of Natural History Library
BHL Page 47677733
Keywords
Portland fissure strata rock geology formation of fissures Portland fissures section portland stone sand clay shale sea level ossiferous square ideal slip bed subside mass sea-level portland fissures fissures sandy clay shaly shaly clay nature beds stone-rock sandy