Halla Beds: Fossils of crinoid limestone (Manten 1971, Table IX) (Silurian of Sweden)

Where: Gotland, Sweden (57.5° N, 18.4° E)

• Paleocoordinates: 4.1° S, 47.5° W (Wright 2013)

• coordinate based on political unit

• local area-level geographic resolution

When: Halla Beds Formation, Homerian (430.6 - 426.7 Ma)

• Correlation based on Jeppsson (1983), Fossils and Strata 15:128.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; 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: A. A. Manten. 1971. Silurian Reefs of Gotland. Developments in Sedimentology 13:1-539 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 13600: authorized by Michael Foote, entered by Michael Foote on 15.04.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

• Algae also included.
Show authors, comments, and common names
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
Ostracoda
 Palaeocopida - Craspedobolbinidae
Craspedobolbina clavata
Artiopoda
 Phacopida - Encrinuridae
Encrinurus punctatus
Encrinurus punctatus Wahlenberg 1821 trilobite
 Proetida - Proetidae
Proetus sp.
Proetus sp. Steininger 1831 trilobite
Gastropoda
 Sorbeoconcha - Hipponicidae
Rothpletzia sp.
Rothpletzia sp. Simonelli 1890 hoof shell
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Stenolaemata
 Cryptostomata - Ptilodictyidae
Ptilodictya lanceolata
Ptilodictya lanceolata Goldfuss 1829
 Cryptostomata - Fenestellidae
Fenestella sp.
Fenestella sp. Lonsdale 1839
Craniata
 Craniopsida - Craniopsidae
Craniops implicata
Rhynchonellata
 Atrypida - Atrypidae
Atrypa reticularis
Atrypa reticularis Linnaeus 1758
 Orthida - Platystrophiidae
"Platystrophia biforata" = Platystrophia biforatus
"Platystrophia biforata" = Platystrophia biforatus Schlotheim 1820
 Orthida - Dalmanellidae
Resserella sp.
Resserella sp. Bancroft 1928
 Rhynchonellida - Trigonirhynchiidae
Rhynchotreta cuneata
 Rhynchonellida - Rhynchotrematidae
"Camarotoechia borealis" = Stegerhynchus borealis
"Camarotoechia borealis" = Stegerhynchus borealis Buch 1834
 Spiriferida - Delthyrididae
Delthyris elevata
Delthyris elevata Dalman 1828
 Spiriferida - Cyrtiidae
Eospirifer radiatus
Eospirifer radiatus Sowerby 1834
 Pentamerida - Gypidulidae
Gypidula galeata
Gypidula galeata Dalman 1828
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena rhomboidalis
Leptaena rhomboidalis Wahlenberg 1818
 Strophomenida - Leptaenoideidae
"Strophomena rugata" = Leptaenoidea rugata
"Strophomena rugata" = Leptaenoidea rugata Lindström 1861
"Strophomena" rugata Lindstrom
 Strophomenida - Chonetidae
Chonetes gotlandicus
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
Anthozoa
  -
Anthozoa indet.
Anthozoa indet. Ehrenberg 1834
Stromatoporoidea
 Stromatoporoidea -
Stromatoporoidea indet.
Stromatoporoidea indet. stromatoporoid sponge
 Labechiida - Labechiidae
Labechia conferta
Labechia conferta Lonsdale 1839 stromatoporoid sponge