Leangella-Dicoelosia ass'n. of Solvik Fmn. in Oslo-Asker Districts (Silurian of Norway)

Where: Norway (59.9° N, 10.8° E: paleocoordinates 25.7° S, 8.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Leangen Member (Solvik Formation), Aeronian (440.8 - 438.5 Ma)

• member-level stratigraphic resolution

Environment/lithology: marine; shale and mudstone

• "The vertical sequence of fossil associations can be related to a sequence of sedimentary facies all dominated by shales and mudstones belonging to an open shelf environment. The last phase of the Ordovician/Silurian glacio-eustatic transgression took place while the initial beds of the Solvik Formation were deposited, producing a deep shelf environment...These interpretations are mainly based on frequency, thickness and structures in storm-associated silt and fine sandstone interbeds which occur throughout the formation...The fossils...normally occur scattered all through the sediment and at variable angles to the bedding...Valves are most often disarticulated but fragmentation and orientation are seldom seen...I regard these assemblages as essentially untransported or `disturbed neighborhood assemblages' (Scott 1974) with the exception of some samples from the Leangen Member...[Transport is only local]."

Collection methods: Abundance data given by Baarli have not been entered.

Primary reference: B. G. Baarli. 1987. Benthic faunal associations in the Lower Silurian Solvik Formation of the Oslo-Asker Districts, Norway. Lethaia 20:75-90 [M. Foote/M. Foote/J. Ju]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 13846: authorized by Michael Foote, entered by Michael Foote on 29.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Anthozoa
 Heliolitida - Heliolitidae
Heliolitidae indet. Lindström 1876 tabulate coral
 Rugosa -
Rugosa indet. horn coral
Trilobita
  -
Trilobita indet. Walch 1771 trilobite
Strophomenata
 Strophomenida - Leptostrophiidae
Eostropheodonta sp. Bancroft 1949
 Strophomenida - Rafinesquinidae
"Leptaena haverfordensis" = Leptaena (Leptaena) haverfordensis
"Leptaena haverfordensis" = Leptaena (Leptaena) haverfordensis Bancroft 1949
 Strophomenida - Furcitellidae
 Strophomenida - Sowerbyellidae
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata de Sowerby and Murchison 1839
 Strophomenida - Leptestiidae
Leangella scissa Davidson 1871
Rhynchonellata
 Athyridida - Meristellidae
"Cryptothyrella sp." = Hindella
"Cryptothyrella sp." = Hindella Davidson 1882
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
 Orthida - Dicoelosiidae
 Pentamerida - Stricklandiidae
Stricklandia lens Sowerby 1839
 Atrypida - Lissatrypidae
Lophophorata
 Tentaculitida - Tentaculitidae
Tentaculites sp. von Schlotheim 1820
Given as "Tentaculites"
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Includes ramose and globular forms.
Stenolaemata
 Fenestrata -
Fenestrata indet. Elias and Condra 1957