Skeinidioides lewisii-Isorthis clivosa Comm. in Riga Formation: Wenlock, Lithuania

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Lingulata - Lingulida - Lingulidae
Lingulidae indet. Gray 1840
Craniata - Craniopsida - Craniopsidae
Craniops implicatus
Rhynchonellata - Pentamerida - Clorindidae
? Clorinda sp. Barrande 1879
Rhynchonellata - Spiriferida - Delthyrididae
Howellella sp. Kozlowski 1946
Rhynchonellata - Spiriferida - Cyrtiidae
? Cyrtia laevis
Cyrtia exporrecta (Wahlenberg 1818)
recombined as Cyrtia exporrectus
Rhynchonellata - Atrypida - Lissatrypidae
Glassia obovata (Sowerby 1839)
recombined as Lissatrypa obovata
Rhynchonellata - Atrypida - Atrypidae
Atrypa reticularis (Linnaeus 1758)
original and current combination Anomia reticularis
Rhynchonellata - Athyridida - Dayiidae
Protozeuga bicarinata (deVerneuil 1848)
Rhynchonellata - Orthida - Rhipidomellidae
Dalejina hybrida (Sowerby 1839)
Rhynchonellata - Orthida - Dalmanellidae
Isorthis amplificata Walmsley 1965
recombined as Isorthis (Tyersella) amplificata
Isorthis clivosa
Resserella canalis (Sowerby 1839)
Rhynchonellata - Protorthida - Skenidiidae
Skenidioides lewisii (Davidson 1848)
Strophomenata - Strophomenida - Rafinesquinidae
Leptaena holcrofti Bassett 1974
Strophomenata - Strophomenida - Aegiromenidae
Aegiria grayi (Davidson 1849)
recombined as Jonesea grayi
Strophomenata - Strophomenida - Leptestiidae
Leangella segmentum (Lindstrom 1861)
recombined as Leangella (Leangella) segmentum
Strophomenata - Strophomenida - Sowerbyellidae
Ygerodiscus sp. (Havlicek 1967)
original and current combination Eoplectodonta (Ygerodiscus)
see common names

Geography
Country:Lithuania
Coordinates: 54.7° North, 23.0° East (view map)
Paleocoordinates:21.4° South, 1.3° East
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Silurian Epoch:Wenlock
10 m.y. bin:Silurian 2
Key time interval:Wenlock
Age range of interval:433.40000 - 427.40000 m.y. ago
Stratigraphy
Formation:Riga
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology:gray,green marl
Secondary lithology: "limestone"
Lithology description: "Widespread in greenish-gray marls with microcrystalline limestone interbeds of the fourth facies zone. Greenish-gray coloring of sediments indicates normal oxygen level environment. From 60 to 80% of the shells are disarticulated, which indicates moderate turbulence, possibly above wave base. Its presence inshore from the G.obovata-S.lewisii Comm. is consistent with a BA 4 position in normally oxygenated wateres with a normal level of turbulence."
Environment:marine indet.
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Collection method comments: I have lumped two separate levels in the borehole and have omitted the absolute and relative abundance data supplied.
Metadata
Database number:13744
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-04-23 12:05:45 Last modified:2006-09-15 15:14:05
Access level:the public Released:2002-04-23 12:05:45
Creative Commons license:CC BY
Reference information

Primary reference:
6146. 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]