Quadraditum |
Quadraditum fantasticum
|
Kentucky |
Late Wenlockian |
Early Ludlovian |
Quadraditum |
Quadraditum incisum
|
Spain |
Middle Siegenian |
Emsian |
Quadraditum |
Quadraditum scutiferum
|
Tunisia |
Early Devonian |
|
Quadratum |
Quadratum fantasticum
|
Florida |
Llandoverian |
|
Quadratum |
Quadratum fantasticum
|
Virginia |
Early Wenlockian |
|
Quadratum |
Quadratum fantasticum
|
Kentucky |
Early Wenlockian |
|
Quadratum |
Quadratum fantasticum
|
Georgia |
Early Wenlockian |
|
Quadratum |
Quadratum fantasticum
|
Alabama |
Early Wenlockian |
|
Quadratum |
Quadratum fantasticum
|
Pennsylvania |
Early Wenlockian |
|
Quadruilobus |
Quadruilobus spinatus
|
Indiana |
Late Ordovician |
|
Retisphaeridium |
Retisphaeridium dichamerum
|
Canada(Alberta) |
Middle Cambrian |
|
Retisphaeridium |
Retisphaeridium vindhyanense
|
India |
Cambrian |
|
Rhachosoarium |
Rhachosoarium lappaceum
|
Indiana |
Late Ordovician |
|
Rhopaliophora |
Rhopaliophora foliatilis
|
Indiana |
Late Ordovician |
|
Rhopaliophora |
Rhopaliophora impexa
|
Indiana |
Late Ordovician |
|
Riculasphaera |
Riculasphaera fissa
|
Oklahoma |
Early Devonian |
|
Riculasphaera |
Riculasphaera loeblichii
|
Tunisia |
Late Siegenian |
|