Skeinidioides lewisii-Isorthis amplificata Comm. in Grauzai borehole (Silurian of Lithuania)

Where: Lithuania (55.3° N, 23.2° E: paleocoordinates 20.9° S, 1.0° E)

• outcrop-level geographic resolution

When: Birstonas and Paprieniai Formation, Wenlock (433.4 - 427.4 Ma)

• Jonava beds of the Birstonas Formation and Vilkija beds of the Paprieniai Formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; gray, green marl and concretionary limestone

• "Widespread in greenish-gray marls with microcrystalline limestone interbeds of the fourth facies zone, and in greenish-gray marls with limestone nodules and wavy bedded interbeds of the thrid facies zone (Nestor & Einasto 1977). The articulation data indicate a normal level of turbulence consistent with normal oxygen level...The occurrence of I. amplificata in more carbonate-rich (shallwer)_ rocks than I. clivosa...allows us to assert that this community was distributed inshore from the S.lewisii-I.clivosa Comm. at the BA 3-4 boundary, but not really far into BA 3."

Collection methods: I have lumped two separate levels in the borehole and have omitted the absolute and relative abundance data supplied. It is not possible to discern from the information given which borehole level corresponds with Jonava beds and which with Vilkija beds.

Primary reference: P. Musteikis and J. J. Paskevicius. 1999. Brachiopod communities of the Lithuanian Silurian. In A. J. Boucot, J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 305-326 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 13746: authorized by Michael Foote, entered by Michael Foote on 23.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Lingulata
 Lingulida - Lingulidae
Craniata
 Craniopsida - Craniopsidae
Rhynchonellata
 Spiriferida - Delthyrididae
Delthyris elevata Dalman 1828
 Spiriferida - Cyrtiidae
Eospirifer radiatus, "Cyrtia exporrecta" = Cyrtia exporrectus
Eospirifer radiatus Sowerby 1834
"Cyrtia exporrecta" = Cyrtia exporrectus Wahlenberg 1818
 Atrypida - Lissatrypidae
"Glassia obovata" = Lissatrypa obovata
"Glassia obovata" = Lissatrypa obovata Sowerby 1839
 Atrypida - Atrypidae
Atrypa reticularis Linnaeus 1758
 Atrypida - Atrypinidae
Atrypina barrandii Davidson 1848
 Athyridida - Dayiidae
Protozeuga bicarinata deVerneuil 1848
 Athyridida - Nucleospiridae
Nucleospira pisum Sowerby 1839
 Orthida - Hesperorthidae
Dolerorthis sp. Schuchert and Cooper 1931
 Orthida - Dicoelosiidae
Dicoelosia biloba Linnaeus 1758
 Orthida - Rhipidomellidae
 Orthida - Dalmanellidae
"Isorthis amplificata" = Isorthis (Tyersella) amplificata Walmsley 1965
Resserella canalis Sowerby 1839
Resserella sabrinae Bassett 1972
 Protorthida - Skenidiidae
Skenidioides lewisii Davidson 1848
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena holcrofti Bassett 1974
 Strophomenida - Strophochonetidae
Protochonetes minimus Sowerby 1839
 Strophomenida - Aegiromenidae
"Aegiria grayi" = Jonesea grayi
"Aegiria grayi" = Jonesea grayi Davidson 1849
 Strophomenida - Leptestiidae
"Leangella segmentum" = Leangella (Leangella) segmentum
"Leangella segmentum" = Leangella (Leangella) segmentum Lindstrom 1861
 Strophomenida - Sowerbyellidae
"Ygerodiscus sp." = Eoplectodonta (Ygerodiscus) Havlicek 1967
Eoplectodonta duvalii Davidson 1847