Keyphrases
Appalachian Region
6%
Atokan
5%
Baker
10%
Climate Change
7%
Coal Ball
21%
Coal Bed
11%
Conodonts
5%
Cyclothems
12%
Desmoinesian
21%
Early Permian
15%
Equatorial Pangaea
8%
Estuary
6%
Fusulinids
6%
Galatia
12%
Highstand
5%
Illinois
25%
Illinois Basin
59%
Indiana
11%
Kasimovian
5%
Kentucky
13%
Late Pennsylvanian
25%
Lowstands
5%
Lycopsid
14%
Midcontinent
10%
Middle Pennsylvanian
25%
Missourian
12%
Moscovian
7%
New Mexico
28%
Non-marine
7%
North Central
16%
Paleosol
12%
Pangea
9%
Peat
32%
Peat Formation
6%
Peat Swamp
11%
Pennsylvanian Coal
5%
Sandstone
10%
Shale
27%
Sigillaria
6%
Siltstone
11%
South Central
7%
Southern Illinois
6%
Springfield
20%
Tectonism
6%
Transgression
8%
Tree Fern
9%
Utah
11%
Western Pangea
5%
Wetlands
8%
Xeromorphic
5%
Earth and Planetary Sciences
Climate Change
8%
Coal Mine
6%
Conodont
6%
Cyclothem
12%
Depositional Sequence
6%
Geological Survey
5%
Illinois
82%
Indiana
16%
Kentucky
12%
Moscovian
6%
Mudstone
5%
New Mexico
24%
North America
20%
Ostracod
5%
Outcrop
5%
Paleosol
16%
Pangaea
20%
Pennsylvanian
100%
Permian
31%
Sandstone
12%
Sea Level
10%
Sea Level Rise
6%
Shallow Water
5%
Siltstone
14%
Stratigraphy
5%
Tectonics
11%
Tree Stump
6%
United States of America
30%
Utah
10%
Vegetation
23%