Lower Visby Beds:Fossils of Gotland found only in Vis.Beds (Manten 1971, T.XVI) (Silurian to of Sweden)

Where: Gotland, Sweden (57.6° N, 18.3° E: paleocoordinates 23.5° S, 3.2° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Lower Visby Beds Formation, Telychian to Telychian (438.5 - 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; "The Lower Visby Beds consist of micritic limestones and marls, without transported and sorted detrital material, accumulated well below the wave base and photic zone; only weak water movements touched the bottom."
• ...thin bedded, rather soft marlstone of bluish grey colour, which alternates with harder marly limestone which is dense to finely crystalline, light grey in colour, and which often contains crystals of pyrite. This limestone occurs partly as thin layers of restricted horizonal extension and partly as knolls or thin lenses...The limestone layers are 1-4 cm thick, but with a majority in the group of 1-2 cm thickness. The marl layers are 2-10 cm thick. (Manten 1971, p. 278)

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 13674: 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".
 Favositida - Alveolitidae
Planalveolites fougti tabulate coral
 Favositida - Theciidae
Thecia hisingeri tabulate coral
 Heliolitida - Halysitidae
Catenipora escharoides Lamarck 1816 tabulate coral
 Cystiphyllida - Tryplasmatidae
"Pholidophyllum tabulatum" = Tryplasma
"Pholidophyllum tabulatum" = Tryplasma horn coral
 Cystiphyllida - Palaeocyclidae
"Porpites (Palaeocyclus) porpita" = Palaeocyclus porpita
"Porpites (Palaeocyclus) porpita" = Palaeocyclus porpita Linnaeus 1767 horn coral
 Cystiphyllida - Goniophyllidae
 Stauriida - Lykophyllidae
"Lykophyllum tabulatum" = Phaulactis
"Lykophyllum tabulatum" = Phaulactis horn coral
 Stauriida - Aulophyllidae
 Euomphalina - Elasmonematidae
"Callonema obesum" = Discordichilus obesum
"Callonema obesum" = Discordichilus obesum Lindström 1884 snail
 Euomphalina - Holopeidae
"Callonema scalariforme" = Holopea scalariforme
"Callonema scalariforme" = Holopea scalariforme Lindström 1884 snail
 Euomphalina - Platyceratidae
"Cyclonema delicatulum" = Cyclonema delicatula
"Cyclonema delicatulum" = Cyclonema delicatula Lindström 1884 snail
 Euomphalina - Oriostomatidae
"Cyclonema giganteum" = Oriostoma giganteum, "Poleumita roemeri" = Oriostoma roemeri
"Cyclonema giganteum" = Oriostoma giganteum Lindström 1884 snail
"Poleumita roemeri" = Oriostoma roemeri Lindström 1884 snail
 Discosorida - Phragmoceratidae
Phragmoceras costatum, "Phragmoceras convolutum" = Phragmoceras munthei
"Phragmoceras convolutum" = Phragmoceras munthei Hedström 1917
 Cystoporata - Ceramoporidae
Ceramopora lindstromi Henning 1908
 Pentamerida - Stricklandiidae
 Orthida - Dalmanellidae
 Orthida - Hesperorthidae
 Spiriferida - Cyrtiidae
Eospirifer marklini deVerneuil 1848
 Atrypida - Anazygidae
""Rhynchonella" exigua" = Zygatrypa exigua
""Rhynchonella" exigua" = Zygatrypa exigua Lindström 1861
 Strophomenida - Sowerbyellidae
"Plectodonta (Sowerbyella) transversalis" = Eoplectodonta (Eoplectodonta) transversalis
"Plectodonta (Sowerbyella) transversalis" = Eoplectodonta (Eoplectodonta) transversalis Wahlenberg 1818
 Strophomenida - Leptostrophiidae
"Brachyprion walmstedti" = Brachyprion (Erinostrophia) walmstedti
"Brachyprion walmstedti" = Brachyprion (Erinostrophia) walmstedti Lindström 1861
 Leperditicopida - Leperditiidae
 Palaeocopida - Craspedobolbinidae
 Palaeocopida - Beyrichiidae
 Palaeocopida - Zygobolbidae
 Phacopida - Encrinuridae