Upper Visby Beds:Fossils of Gotland found only in Vis. Beds (Manten 1971, T.XVI) (Silurian of Sweden)
Where: Gotland, Sweden (57.6° N, 18.3° E: paleocoordinates 21.6° S, 3.0° W)
• coordinate based on political unit
• local area-level geographic resolution
When: Upper Visby Beds Formation, Sheinwoodian (433.4 - 430.5 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: offshore ramp; lithified, gray, blue marl and lithified, pyritic, gray limestone
• SEP: Silurian of Gotland has been variably described as a ramp and platform. Based on my read of the literature, I think if falls best into the ramp category. From Samtleben et al. (1996). Geol. Rundsch 85:278-292; "This series of micritic limestones and marls (of the Lower Visby) shows upward increasing intercalations of biodetritic limestones (packstones, in the upper part grainstones) which indicate episodes of wave-base influence on the sea floor...erosional discordances and channel structures indicate the effects of bottom currents."
• ...thin layers of rather soft bluish grey marlstone which alternate with harder marly limestone. The latter is dense to finely crystalline and light grey in color. Lithologically, therefore, there is little difference between the Upper Visby Beds and the underlying Lower Visby sediments...In the marly limestone, pyrite is found locally in isolated crystals or in groups of crystals... (Manten 1971, p. 280)
Primary reference: A. A. Manten. 1971. Silurian Reefs of Gotland. Developments in Sedimentology 13:1-539 [M. Foote/M. Foote/P. Wagner]more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 13675: authorized by Michael Foote, entered by Michael Foote on 17.04.2002, edited by Pete Wagner
Creative Commons license: CC BY (attribution)
Taxonomic list
• List restricted to "fossils which in Gotland are found only in the Visby Beds".
Show authors, comments, and common names
| Anthozoa | |
"Pholidophyllum tabulatum" = Tryplasma
"Pholidophyllum tabulatum" = Tryplasma horn coral | |
|
Goniophyllum pyramidale horn coral | |
"Phaulactis angusta" = Phaulactis, "Lykophyllum tabulatum" = Phaulactis
"Phaulactis angusta" = Phaulactis horn coral
"Lykophyllum tabulatum" = Phaulactis horn coral | |
|
Clisiophyllum (Dinophyllum) involutum horn coral | |
|
Catenipora escharoides Lamarck 1816 tabulate coral | |
|
Thecia hisingeri tabulate coral | |
|
Planalveolites fougti tabulate coral | |
| Stenolaemata | |
|
Ceramopora lindstromi Henning 1908 | |
| Rhynchonellata | |
""Rhynchonella" exigua" = Zygatrypa exigua
""Rhynchonella" exigua" = Zygatrypa exigua Lindström 1861 | |
| Strophomenata | |
|
Liljevallia gotlandica Hedstrom 1917 | |
| Gastropoda | |
"Poleumita roemeri" = Oriostoma roemeri, "Cyclonema giganteum" = Oriostoma giganteum
"Poleumita roemeri" = Oriostoma roemeri Lindström 1884 snail
"Cyclonema giganteum" = Oriostoma giganteum Lindström 1884 snail | |
"Cyclonema delicatulum" = Cyclonema delicatula
"Cyclonema delicatulum" = Cyclonema delicatula Lindström 1884 snail | |
"Callonema obesum" = Discordichilus obesum
"Callonema obesum" = Discordichilus obesum Lindström 1884 snail | |
"Callonema scalariforme" = Holopea scalariforme
"Callonema scalariforme" = Holopea scalariforme Lindström 1884 snail | |
| Trilobita | |
|
Encrinurus laevis trilobite | |
| Ostracoda | |
|
Craspedobolbina jugligera ostracod | |
|
Apatobolbina tricuspidata ostracod | |