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

Where: Norway (59.9° N, 10.8° E: paleocoordinates 26.7° S, 8.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Myren Member (Solvik Formation), Rhuddanian (443.4 - 440.8 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 13843: authorized by Michael Foote, entered by Michael Foote on 29.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Anthozoa
 Rugosa -
Rugosa indet. horn coral
Trilobita
  -
Trilobita indet. Walch 1771 trilobite
Strophomenata
 Strophomenida - Leptestiidae
Leangella scissa Davidson 1871
 Strophomenida - Sowerbyellidae
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata de Sowerby and Murchison 1839
Rhynchonellata
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Pentamerida - Clorindidae
"Clorinda undata" = Clorilamnulella undata
"Clorinda undata" = Clorilamnulella undata de Sowerby and Murchison 1839
 Atrypida - Atrypinidae
Eospirigerina gaspeensis Schuchert and Cooper 1930
 Orthida - Dicoelosiidae
 Orthida - Dalmanellidae
"Isorthis prima" = Levenea llandoveriana Williams 1951
Howellites sp. Bancroft 1945
 Orthida - Draboviidae
Kinnella sp. Bergström 1968
 Orthida - Hesperorthidae
Dolerorthis sp. Schuchert and Cooper 1931
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Includes ramose, encrusting, and globular forms