Dicoelosia-Skenidioides Comm., Svedasai-252 Borehole (487.4 m) (Silurian to of Lithuania)

Where: Lithuania (55.7° N, 25.4° E: paleocoordinates 21.8° S, 1.6° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Llandovery to Llandovery (443.4 - 423.0 Ma)

• I have not yet located a source that gives likely age vs. depth for this borehole. The community as a whole is said to range from Late Llandovery to Early Ludlow. Community is also said to occur in Sutkai Beds of the Paprienia Formation (Lower Wenlockian) in this borehole, but it is not at all clear that the levels listed in Table 21.5 correspond to these beds. In fact, there are conspicuous differences in faunal content between beds listed in Table 21.5 and fauna explicitly mentioned as coming from Sutkai Beds.

• bed-level stratigraphic resolution

Environment/lithology: marine; gray, green, argillaceous marl and lime mudstone

• "The fauna belongs in the BA 4-5 span, and is here positioned in BA 4. [Shells predominantly disarticulated, but not exclusively.] The articulation data indicates a normal level of turbulence consistent with a normal oxygen level."
• "Occurs in greenish, argillaceous marls and in greenish-gray marls with interbeds of microcrystalline linestone of the fourth facies zone."

Collection methods: Brachiopods listed (with abundances) in table 21.5.

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 26288: authorized by Michael Foote, entered by Michael Foote on 11.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Lingulata
 Lingulida - Discinidae
Orbiculoidea sp. d'Orbigny 1847
Craniata
 Craniopsida - Craniopsidae
Rhynchonellata
 Protorthida - Skenidiidae
Skenidioides lewisii Davidson 1848
 Pentamerida - Parastrophinidae
 Atrypida - Atrypinidae
Atrypina barrandii Davidson 1848
 Atrypida - Atrypidae
Atrypa reticularis Linnaeus 1758
 Orthida - Dicoelosiidae
Dicoelosia biloba Linnaeus 1758
 Orthida - Dalmanellidae
Resserella canalis Sowerby 1839
 Orthida - Rhipidomellidae
Dalejina hybrida Sowerby 1839
 Orthida - Hesperorthidae
Strophomenata
 Strophomenida - Leptestiidae
"Leangella segmentum" = Leangella (Leangella) segmentum
"Leangella segmentum" = Leangella (Leangella) segmentum Lindstrom 1861
 Strophomenida - Sowerbyellidae
Eoplectodonta duvalii Davidson 1847
 Strophomenida - Eopholidostrophiidae
"Pholidostrophia (Mesopholidostrophia) laevigata" = Mesopholidostrophia laevigata
"Pholidostrophia (Mesopholidostrophia) laevigata" = Mesopholidostrophia laevigata de Sowerby and Murchison 1839
 Orthotetida - Triplesiidae
Streptis grayii Davidson 1848