Topic 361
rock,
strata,
hills,
district,
sea,
quartz,
slate,
veins,
deposits,
gravel,
vein,
thick,
shale,
extent,
structure,
drift,
dip,
glacier,
bottom,
distance,
shaft,
sandstone,
top,
character,
shales,
origin,
miles,
Creek,
stratum,
tunnel,
fossil,
quarry,
formed,
marine,
locality,
formations,
fine,
sands,
gneiss,
Survey,
glaciers,
forming,
remains,
Cretaceous,
deposition,
slates,
drainage,
fragments,
extends
Volumes with greatest proportion