Vestbråten (Ordovician to of Norway)

Where: Oslo, Norway (59.9° N, 10.7° E: paleocoordinates 31.7° S, 9.6° W)

• local area-level geographic resolution

When: Dicranograptus clingani graptolite zone, Norderhov Formation, Soudleyan to Soudleyan (458.4 - 454.0 Ma)

• Listed as Norderhov, which Arnold Miller (personal notes) considers continuous with Nakholmen.

•

•= Upper Chasmops shale, 4by in older literature

• formation-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified, black, silty lime mudstone and limestone

• Black, dark silty, calcareous mudstone/shale with occasional horizons of nodular and planar grey limestone; very deep, distal shelf, offshore

Size class: macrofossils

Preservation: cast

Primary reference: A. W. Owen and D. A. T. Harper. 1982. The Middle Ordovician of the Oslo Region, Norway, 31. The upper Caradoc trilobites and brachiopods from Vestbraten, Ringerike. Norsk Geologisk Tidsskrift 62:95-120 [A. Miller/P. Novack-Gottshall/A. Clement]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 2762: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 18.07.1999, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Systematics of trilobites and brachiopods
Show authors, comments, and common names
Cephalopoda
 Orthocerida - Kionoceratidae
? Polygrammoceras sp.
? Polygrammoceras sp. Foerste 1927
originally entered as "Polygrammoceras? sp."
 Dissidocerida - Geisonoceratidae
? Protokionoceras sp.
? Protokionoceras sp. Grabau and Shimer 1910
originally entered as "Protokionoceras? sp."
Gastropoda
 Euomphalina - Platyceratidae
Cyclonema sp.
Cyclonema sp. Hall 1852 snail
 Euomphalina - Holopeidae
Haplospira cf. variabilis2
Haplospira cf. variabilis2 Koken 1897 snail
 Bellerophontida - Sinuitidae
? Sinuites sp.
? Sinuites sp. Koken 1896 snail
originally entered as "Sinuites? sp."
Bivalvia
 Cyrtodontida - Cyrtodontidae
Cyrtodontula aff. complanata1
Cyrtodontula aff. complanata1 Foerste 1914 clam
 Myalinida - Ambonychiidae
Ambonychinia cf. quadrata1
 Solemyida - Ctenodontidae
Ctenodonta spjeldnaesi1
Ctenodonta spjeldnaesi1 Soot-Ryen and Soot-Ryen 1960 clam
Stenolaemata
 Trepostomata - Halloporidae
Diplotrypa sp.
Diplotrypa sp. Nicholson 1879
Lingulata
 Lingulida - Discinidae
Orbiculoidea sp.
Orbiculoidea sp. d'Orbigny 1847
Rhynchonellata
 Pentamerida - Parastrophinidae
Parastrophinella sp.
Parastrophinella sp. Schuchert and Cooper 1931
 Orthida - Productorthidae
? Nicolella sp.
? Nicolella sp. Reed 1917
originally entered as "Nicolella? sp."
 Orthida - Plectorthidae
Plectorthis sp.
Plectorthis sp. Hall and Clarke 1892
 Orthida - Rhactorthidae
Rhactorthis sp.
Rhactorthis sp. Williams 1963
Strophomenata
 Orthotetida - Triplesiidae
Oxoplecia sp., Triplesia aff. insularis
Oxoplecia sp. Wilson 1913
Triplesia aff. insularis Eichwald 1843
 Strophomenida - Sowerbyellidae
Sowerbyella sp.
Sowerbyella sp. Jones 1928
 Strophomenida - Rafinesquinidae
Hedstroemina ungula, "Kjerulfina" foliovalve, Kjerulfina polycyma, "Leptaena cf. strandi" = Leptaena (Leptaena) strandi
Hedstroemina ungula Spjeldnaes 1957
"Kjerulfina" foliovalve Spjeldnaes 1957
Kjerulfina polycyma Bancroft 1929
Kjerulfina polycyma limbata
"Leptaena cf. strandi" = Leptaena (Leptaena) strandi Spjeldnaes 1957
 Strophomenida - Strophomenidae
Strophomena sp.
Strophomena sp. Rafinesque and De Blainville 1824
Trilobita
 Corynexochida - Illaenidae
Stenopareia sp.
Stenopareia sp. Holm 1886 trilobite
 Asaphida - Remopleurididae
Remopleurides sp.
Remopleurides sp. Portlock 1843 trilobite
 Trinucleida - Raphiophoridae
Lonchodomas aff. rostratus
Lonchodomas aff. rostratus Sars 1835 trilobite
 Trinucleida - Trinucleidae
Broeggerolithus discors
Broeggerolithus discors Angelin 1854 trilobite
 Lichida - Lichidae
Platylichas cf. laxatus
Platylichas cf. laxatus McCoy 1846 trilobite
 Proetida - Aulacopleuridae
Harpidella sp.
Harpidella sp. M'Coy 1849 trilobite
 Proetida - Tropidocoryphidae
Decoroproetus furubergensis
Decoroproetus furubergensis Owens 1970 trilobite
 Phacopida - Encrinuridae
Atractopyge sp.
Atractopyge sp. Hawle and Corda 1847 trilobite
 Phacopida - Pterygometopidae
"Toxochasmops extensus" = Toxochasmops (Toxochasmops) extensus
"Toxochasmops extensus" = Toxochasmops (Toxochasmops) extensus Boeck 1838 trilobite
 Odontopleurida - Odontopleuridae
Apianurus abietinus
Apianurus abietinus Bruton 1965 trilobite
1Soot-Ryen and Soot-Ryen 1960; 2Wagner 2023