Brachiopods of Eoplectodonta-Isorthis ass'n at Malmoeya and Spirodden (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: Includes data collected by Worsley (1971) and Baarli. Abundance data given by Baarli have not been entered. Only brachiopods reported by Baarli.

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 13850: authorized by Michael Foote, entered by Michael Foote on 29.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Atrypida - Cyclospiridae
? Cyclospira sp. Hall and Clarke 1893
 Atrypida - Glassiidae
Glassia sp. Davidson 1881
 Atrypida -
Protatrypa malmoeyensis Boucot et al. 1964
 Atrypida - Lissatrypidae
 Orthida - Dicoelosiidae
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
 Orthida - Hesperorthidae
Dolerorthis plicata de Sowerby and Murchison 1839
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Pentamerida - Stricklandiidae
Stricklandia lens Sowerby 1839
 Pentamerida - Clorindidae
"Clorinda undata" = Clorilamnulella undata
"Clorinda undata" = Clorilamnulella undata de Sowerby and Murchison 1839
 Rhynchonellida - Camarotoechiidae
Camarotoechia sp. Hall and Clarke 1893
Strophomenata
 Strophomenida - Sowerbyellidae
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata de Sowerby and Murchison 1839
 Strophomenida - Leptestiidae
Leangella scissa Davidson 1871
 Strophomenida - Amphistrophiidae
Amphistrophia sp. Hall and Clarke 1892
 Strophomenida - Furcitellidae
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Lingulata
 Lingulida - Discinidae
Orbiculoidea sp. d'Orbigny 1847