Tasmanites |
Tasmanites sp
|
Africa(Sahara) |
Silurian |
|
Tasmanites |
Tasmanites sp
|
Alaska |
Jurassic |
Cretaceous |
Tasmanites |
Tasmanites punctatus
|
Australia(Tasmania) |
Permian |
|
Tasmanites |
Tasmanites erraticus
|
Baltic |
Silurian |
|
Tasmanites |
Tasmanites huronensis
|
Canada |
Devonian |
|
Pterospermopsis |
Pterospermopsis helios
|
France |
Neocomian |
|
Pterospermopsis |
Pterospermopsis helios
|
France |
Kimmeridgian |
|
Tasmanites |
Tasmanites tardus
|
France |
Kimmeridgian |
|
Crassosphaera |
Crassosphaera hexagonalis
|
France |
Liassic |
|
Perisaccus |
Perisaccus laevigatus
|
France |
Frasnian |
|
Leiosphaeridia |
Leiosphaeridia ferquensis
|
France |
Frasnian |
|
Pachysphaera |
Pachysphaera pelagica
|
Mediterranean Sea |
Miocene |
|
Tasmanites |
Tasmanites
|
Nd |
Late Precambrian |
Recent |
Leiosphaeridia |
Leiosphaeridia
|
Nd |
Late Precambrian |
Recent |
Cymatiosphaera |
Cymatiosphaera
|
Nd |
Late Precambrian |
Recent |
Tytthodiscus |
Tytthodiscus
|
Nd |
Liassic |
Recent |
Crassosphaera |
Crassosphaera
|
Nd |
Liassic |
Recent |