Dicoelosia-fenestrate bryozoan 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 13845: authorized by Michael Foote, entered by Michael Foote on 29.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
  -
Trilobita indet. Walch 1771 trilobite
Ostracoda
  -
Ostracoda indet. Latreille 1802 ostracod
Lophophorata
 Tentaculitida - Tentaculitidae
Tentaculites sp. von Schlotheim 1820
given as "Tentaculites"
Strophomenata
 Strophomenida - Sowerbyellidae
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata de Sowerby and Murchison 1839
 Strophomenida - Aegiromenidae
 Strophomenida - Leptestiidae
Leangella scissa Davidson 1871
 Strophomenida - Rafinesquinidae
"Leptaena haverfordensis" = Leptaena (Leptaena) haverfordensis
"Leptaena haverfordensis" = Leptaena (Leptaena) haverfordensis Bancroft 1949
 Strophomenida - Strophomenidae
Rhynchonellata
 Pentamerida - Stricklandiidae
Stricklandia lens Sowerby 1839
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Atrypida - Atrypidae
Protatrypa malmoeyensis Boucot et al. 1964
 Atrypida - Lissatrypidae
 Orthida - Draboviidae
Salopina sp. Boucot 1960
 Orthida - Rhipidomellidae
Mendacella sp. Cooper 1930
 Orthida - Dicoelosiidae
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
 Orthida - Hesperorthidae
Dolerorthis plicata de Sowerby and Murchison 1839
Craniata
 Craniopsida - Craniopsidae
Paracraniops sp. Williams 1963
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
"Stick bryozoans"
Stenolaemata
 Fenestrata -
Fenestrata indet. Astrova and Morozova 1956
Osteichthyes
 Dipnoi - Phaneropleuridae
Pentlandia sp. Watson and Day 1916 lungfish
Anthozoa
 Favositida - Favositidae
Favositidae indet. Dana 1846 tabulate coral
 Rugosa -
Rugosa indet. horn coral
Scyphozoa
 Conulariida -
Conulariida indet. Miller and Gurley 1896 jellyfish