Subject ASC0003yxs
The geologist : a popular monthly magazine of geology.
v.4 (1861), Page 260 (1861)
American Museum of Natural History Library
BHL Page 47658969
Keywords
general form gravel sand pipe grays thurrock triangle funnel shape strata chalk sandpipe stratigraphy geology sedimentology limestone Grays Thurrock sand-pipe gravel pipe cross-section