Topic 861
beds,
limestone,
formation,
surface,
deposits,
Lower,
section,
sandstone,
masses,
exposed,
nearly,
red,
formed,
remains,
Coal,
deposited,
eastern,
Limestone,
waters,
areas,
geology,
valleys,
fossils,
gray,
slope,
fragments,
seam,
plants,
features,
trap,
obtained,
organic,
evidence,
streams,
gypsum,
seams,
variety,
rich,
springs,
amount,
appears,
marl,
contain,
erosion,
rise,
mile,
vicinity,
Rocks,
abundance
Volumes with greatest proportion