Tylotopalla |
Tylotopalla sp
|
USA |
Llandoverian |
|
Tylotopalla |
Tylotopalla sp
|
England |
Telychian |
Ludfordian |
Tylotopalla |
Tylotopalla sp
|
Wales |
Telychian |
Ludfordian |
Tylotopalla |
Tylotopalla sp
|
Norway |
Telychian |
|
Tylotopalla |
Tylotopalla sp
|
USSR(Ukrainian SSR) |
Wenlockian |
|
Tylotopalla |
Tylotopalla sp
|
Austria |
Wenlockian |
|
Tylotopalla |
Tylotopalla sp
|
Belgium |
Rhuddanian |
|
Visbysphaera |
Visbysphaera dilatispinosa
|
USA |
Wenlockian |
|
Visbysphaera |
Visbysphaera dilatispinosa
|
Wales |
Telychian |
Ludfordian |
Visbysphaera |
Visbysphaera dilatispinosa
|
England |
Telychian |
Ludfordian |
Visbysphaera |
Visbysphaera dilatispinosa
|
Norway |
Telychian |
|
Visbysphaera |
Visbysphaera dilatispinosa
|
Belgium |
Telychian |
Wenlockian |
Visbysphaera |
Visbysphaera dilatispinosa
|
Africa |
Silurian |
|