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