Resserella canalis-Protomegastrophia semiglobosa Comm., Steinsfjorden Fm. at Lan (Silurian of Norway)

Where: Norway (68.8° N, 15.0° E: paleocoordinates 12.2° S, 9.5° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Steinsfjorden Formation, Sheinwoodian (433.4 - 430.5 Ma)

• Middle part of formation with age probably near Sheinwoodian/Homerian transition.

• formation-level stratigraphic resolution

Environment/lithology: marine; carbonate

• "..dominance of [forms with high S/V ratio] indicates soft bottom...Herpetocrinus current-oriented...Probably soft-bottom, low-energy, shallow waters near intertidal in BA 2."
• "...community developed in carbonates alternating with the Ptilodictya lanceolata Comm., which is developed on hardgrounds."

Collection methods: Table 22.15 includes specimen counts.

Primary reference: B. G. Baarli, H. B. Keilen, and M. E. Johnson. 1999. Silurian communities of the Oslo Region, Norway. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 327-349 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 14314: authorized by Michael Foote, entered by Michael Foote on 30.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Some taxa are not listed to the genus level.
Anthozoa
 Favositida - Favositidae
Favosites forbesi tabulate coral
 Rugosa -
Rugosa indet. horn coral
solitary
Trilobita
 Phacopida - Encrinuridae
Encrinurus cf. punctatus Wahlenberg 1821 trilobite
Ostracoda
 Palaeocopida - Beyrichiidae
"Neobeyrichia sp." = Beyrichia
"Neobeyrichia sp." = Beyrichia M'Coy 1846 ostracod
 Leperditicopida - Leperditiidae
Herrmannina sp. Kegel 1933 ostracod
Strophomenata
 Strophomenida - Amphistrophiidae
 Strophomenida - Strophonellidae
 Strophomenida - Leptostrophiidae
 Strophomenida - Rafinesquinidae
"Leptaena depressa" = Leptaena (Leptaena) depressa
"Leptaena depressa" = Leptaena (Leptaena) depressa Sowerby 1824
Rhynchonellata
 Spiriferida - Delthyrididae
Delthyris elevata Dalman 1828
 Rhynchonellida - Trigonirhynchiidae
 Orthida - Dalmanellidae
Resserella canalis Sowerby 1839
 Atrypida - Glassiidae
cf. Glassia sp. Davidson 1881
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
bryozoan sp. B
Bivalvia
 Ostreida - Pterineidae
Gastropoda
 Euomphalina - Euomphalidae
"Oriostoma discors" = Poleumita discors
"Oriostoma discors" = Poleumita discors Sowerby 1814 snail
Crinoidea
 Myelodactylida - Myelodactylidae
Herpetocrinus sp. Salter 1873 Sea lily