Micrhystridium |
Micrhystridium ampliatum
sp. nov. |
Iowa |
Late Frasnian |
|
Micrhystridium |
Micrhystridium piriforme
|
Iowa |
Late Frasnian |
|
Micrhystridium |
Micrhystridium stellapilosum
|
Iowa |
Late Frasnian |
|
Micrhystridium |
Micrhystridium stellatum
|
Iowa |
Late Frasnian |
|
Multiplicisphaeridium |
Multiplicisphaeridium ancorum
|
Iowa |
Late Frasnian |
|
Multiplicisphaeridium |
Multiplicisphaeridium ramusculosum
|
Iowa |
Late Frasnian |
|
Oppilatala |
Oppilatala sp
|
Iowa |
Late Frasnian |
|
Polyedryxium |
Polyedryxium decorum
|
Iowa |
Late Frasnian |
|
Polyedryxium |
Polyedryxium embudum
|
Iowa |
Late Frasnian |
|
Polyedryxium |
Polyedryxium pharaone
|
Iowa |
Late Frasnian |
|
Pratulasphaera |
Pratulasphaera
|
Iowa |
Late Frasnian |
|
Pratulasphaera |
Pratulasphaera novacula
sp. nov. |
Iowa |
Late Frasnian |
|
Punctatisporites |
Punctatisporites sp
|
Iowa |
Late Frasnian |
|
Retusotriletes |
Retusotriletes sp
|
Iowa |
Late Frasnian |
|
Samarisporites |
Samarisporites
|
Iowa |
Late Frasnian |
|
Secarisporites |
Secarisporites sp
|
Iowa |
Late Frasnian |
|
Solisphaeridium |
Solisphaeridium rigidispinosum
|
Iowa |
Late Frasnian |
|