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Author:
Ravn,R.L.
Year:
1986
Title:
Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa
Reference:
Ravn,R.L. (1986) Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa Iowa Geological Survey,Technical Paper # 7 P. 1- 244
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Genus Species Country(Region) From To
Granulatisporites Granulatisporites spinosus Iowa Middle Pennsylvanian
Granulatisporites Granulatisporites spinosus Iowa Morrowan Desmoinesian
Granulatisporites Granulatisporites spinosus Illinois Middle Pennsylvanian
Granulatisporites Granulatisporites tuberculatus Nd Nd
Granulatisporites Granulatisporites verrucosus Iowa Morrowan Desmoinesian
Gravisporites Gravisporites sphaerus Iowa Desmoinesian Early Missourian
Grumosisporites Grumosisporites papillosus Iowa Morrowan Atokan
Grumosisporites Grumosisporites papillosus Iowa Morrowan
Grumosisporites Grumosisporites rufus Iowa Middle Pennsylvanian
Grumosisporites Grumosisporites ruginosus Australia(Queensland) Visean
Grumosisporites Grumosisporites varioreticulatus Iowa Morrowan Atokan
Gulisporites Gulisporites torpidus Iowa Morrowan
Guthoerlisporites Guthoerlisporites delicatus Iowa Morrowan Early Missourian
Guthoerlisporites Guthoerlisporites desmoinesensis Iowa Atokan
Guthoerlisporites Guthoerlisporites volans Iowa Atokan
Guthoerlisporites Guthoerlisporites volans Iowa Atokan
Hymenospora Hymenospora caperata Iowa Morrowan Atokan