|
|
|
|
|
|
|
|
Lower
Devonian
|
Middle Devonian |
Lower
Devonian
|
Lower
Devonian
|
Scotland |
Scotland |
Scotland |
Scotland |
|
|
|
|
|
|
|
|
Middle
Devonian |
Middle
Silurian |
Upper
Silurian |
Upper
Silurian |
Scotland |
Scotland |
Scotland |
Scotland |
|
|
|
|
|
|
|
|
Upper
Silurian |
Pennsylvanian |
Middle
Devonian |
Upper
Silurian |
Scotland |
Kansas |
Scotland |
Scotland |
|
|
|
|
|
|
|
|
Upper
Silurian |
Upper
Silurian |
Carboniferous |
Upper
Devonian |
Scotland |
Scotland |
Siberia |
Ukraine |
|
|
|
|
|
|
|
|
Middle
Devonian |
Upper
Devonian |
Middle
Devonian |
Upper
Devonian |
Scotland |
Quebec,
Canada |
Scotland |
Podolia,
Ukraine |
|
|
|
|
|
|
|
|
Lower
Devonian |
Early Permian |
Carboniferous |
Carboniferous |
Caithness,
Scotland |
Pflaz,
Germany |
Bear
Gulch, Montana |
Siberia |
|
|
|
|
|
|
Palaeobergia
microlepis |
|
Lower
Devonian |
Mississippian |
Carboniferous |
Permian |
Tynet
Burn, Scotland |
Bear
Gulch Limestone, Montana |
Siberia |
Jeckenbach
Formation, Germany |
|
|
|
|
|
|
|
|
Middle
Devonian |
Mississippian
|
Mississippian
|
Devonian |
Scotland |
Bear
Gulch Limestone, Montana |
Bear
Gulch Limestone, Montana |
New
South Wales, Australia |
|
|
|
|
|
|
|
|
Middle
Devonian |
Mississippian
|
Mississippian
|
Mississippian |
New
South Wales, Australia |
Bear
Gulch Limestone, Montana
|
Bear
Gulch Limestone, Montana
|
Albert
Shale, New Brunswick,
Canada |
|
|
|
|
|
|
Scaumenacia curta |
|
Mississippian |
Carboniferous |
Upper Devonian |
|
Bear
Gulch Limestone, Montana |
Siberia |
Escumiac Bay, Quebec, Canada |
|
150 |
|
|
|