Halla Beds Brachiopods (Silurian of Sweden)

Where: Gotland, Sweden (57.5° N, 18.4° E: paleocoordinates 19.7° S, 2.6° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Halla Beds Formation, Homerian (430.5 - 427.4 Ma)

• Correlation from Jeppsson (1983), Fossils and Strata 15:128

• group of beds-level stratigraphic resolution

Environment/lithology: marine; bioturbated, argillaceous limestone and ooidal limestone

• Ref. 11073: "Halla Beds (15m): In the eastern part of Gotland a series of shallow marine sediments was deposited on a discontinuity plane. Pure oolites at the base are overlain by bioturbated argillaceous limestones with an abundant but impoverished marine fauna, indicating marginal marine to lagoonal conditions. These limestones grade into conglomeratic oncolites which are interrupted by evenly abraded hardgrounds..."

Primary reference: M. G. Bassett and L. R. M. Cocks. 1974. A review of Silurian brachiopods from Gotland. Fossils and Strata (3)1-56 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13528: authorized by Michael Foote, entered by Michael Foote on 12.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Leptaenioidea silurica
Chileata
 Dictyonellida - Eichwaldiidae
Dictyonella capewellii
Dictyonella capewellii Davidson 1848
Strophomenata
 Strophomenida - Furcitellidae
Pentlandina loveni
Pentlandina loveni Verneuil 1848
 Strophomenida - Strophochonetidae
Protochonetes minimus, Strophochonetes cingulatus
Protochonetes minimus Sowerby 1839
Strophochonetes cingulatus Lindström 1861
 Orthotetida - Chilidiopsidae
Morinorhynchus adnatus
Morinorhynchus adnatus Hedström 1917
 Orthotetida - Triplesiidae
Plectotreta lindstroemi
Plectotreta lindstroemi Ulrich and Cooper 1936
Rhynchonellata
 Pentamerida - Gypidulidae
Gypidula galeata
Gypidula galeata Dalman 1828
 Pentamerida - Pentameridae
Pentamerus gothlandicus
 Spiriferida - Cyrtinopsidae
Kozlowskiellina deltidialis
 Spiriferida - Delthyrididae
Howellella elegans
Howellella elegans Muir-Wood 1925
 Spiriferida - Cyrtiidae
"Cyrtia exporrecta" = Cyrtia exporrectus, Eospirifer radiatus
"Cyrtia exporrecta" = Cyrtia exporrectus Wahlenberg 1818
Eospirifer radiatus Sowerby 1834
 Atrypida - Lissatrypidae
"Glassia obovata" = Lissatrypa obovata
"Glassia obovata" = Lissatrypa obovata Sowerby 1839
 Atrypida - Atrypidae
Atrypa reticularis
Atrypa reticularis Linnaeus 1758
 Orthida - Dalmanellidae
? Isorthis ? crassa
? Isorthis ? crassa Lindström 1861
 Orthida - Rhipidomellidae
Dalejina hybrida
Dalejina hybrida Sowerby 1839
 Athyridida - Meristellidae
Whitfieldella sp., Meristina obtusa
Whitfieldella sp. Hall and Clarke 1893
Meristina obtusa Dalman 1828
 Athyridida - Rhynchospirinidae
Homoeospira baylei
Homoeospira baylei Davidson 1848
 Rhynchonellida - Hebetoechiidae
Sphaerirhynchia spp.
Sphaerirhynchia spp. Cooper and Muir-Wood 1951
 Rhynchonellida - Trigonirhynchiidae
? Microsphaeridiorhynchus nucula, ? Ancillotoechia ? bidentata, Rhynchotreta cuneata
Rhynchotreta cuneata Dalman 1828