Hamra Beds: Fossils of Hoburgen-type reef limestone (Manten 1971, Table IX): Ludfordian, Sweden

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Crotalocrinus sp.
Crinoidea
Crinoidea indet. Miller 1821
Tentaculita
Autodetus calyptratus
synonym of Anticalyptraea
Strophomenata - Strophomenida - Strophomenidae
Strophomena sp. Rafinesque and De Blainville 1824
"Strophomena" sp.
Rhynchonellata - Pentamerida - Parastrophinidae
Anastrophia deflexa (Sowerby 1839)
Rhynchonellata - Spiriferida - Cyrtiidae
Eospirifer sp. Schuchert 1913
Rhynchonellata - Athyridida - Rhynchospirinidae
Rhynchospirina baylei
Rhynchonellata - Atrypida - Atrypidae
Plectatrypa marginalis
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Camarotoechia nucula (Sowerby 1839)
recombined as Microsphaeridiorhynchus nucula
Rhynchonellata - Rhynchonellida - Camarotoechiidae
Camarotoechia diodonta
Rhynchonellata - Orthida - Linoporellidae
Linoporella punctata (deVerneuil 1848)
Rhynchonellata - Orthida - Hesperorthidae
Ptychopleurella bouchardi (Davidson 1847)
Dolerorthis rustica (Sowerby 1839)
Stenolaemata - Cystoporata - Fistuliporidae
Fistulipora sp. McCoy 1850
Cephalopoda
Cephalopoda indet. Cuvier 1797
Cephalopoda - Ascocerida - Ascoceratidae
Ascoceras bohemicum
Ascoceras gradatum
Cephalopoda - Orthocerida - Orthoceratidae
Orthoceras sp. Breynius 1832
Gastropoda - Euomphalina - Platyceratidae
Platyceras disciforme Lindström 1884
Gastropoda - Euomphalina - Oriostomatidae
Poleumita globosum (von Schlotheim 1820)
recombined as Oriostoma globosum
Paragastropoda - Mimospirida - Onychochilidae
Oriostoma contrarium Lindström 1884
recombined as Onychochilus contrarium
Anthozoa
Anthozoa indet. Ehrenberg 1834
Anthozoa - Stauriida - Cyathophyllidae
Cyathophyllum bisectum
Anthozoa - Stauriida - Acervulariidae
Acervularia ananas
Acervularia sp. Schweigger 1819
Anthozoa - Favositida - Favositidae
Favosites sp. Lamarck 1816
Favosites gothlandicus Lamarck 1816
Anthozoa - Heliolitida - Heliolitidae
Heliolites interstinctus
Heliolites sp. Dana 1846
Heliolites barrandei Penecke 1887
Anthozoa - Heliolitida - Plasmoporidae
Plasmopora scita
Anthozoa - Heliolitida - Proporidae
Propora conferta
Stromatoporoidea - Stromatoporoidea
Stromatoporoidea indet. Nicholson and Murie 1878
Stromatoporoidea - Stromatoporellida - Stromatoporellidae
Stromatoporella sp. Nicholson 1886
Stromatoporoidea - Syringostromatida - Syringostromatidae
Syringostroma sp. Nicholson 1865
Stromatoporoidea - Labechiida - Labechiidae
Labechia conferta (Lonsdale 1839)
unclassified
Rothpletzella sp. Wood 1948
Rhodophyceae - Solenoporaceae
Solenopora sp. Dybowski 1877
Algae
Algae indet.
see common names

Geography
Country:Sweden State/province:Gotland
Coordinates: 57.5° North, 18.4° East (view map)
Paleocoordinates:16.5° South, 2.4° West
Basis of coordinate:based on political unit
Geographic resolution:local area
Time
Period:Silurian Epoch:Ludlow
Stage:Ludfordian 10 m.y. bin:Silurian 2
Key time interval:Ludfordian
Age range of interval:425.60000 - 423.00000 m.y. ago
Stratigraphy
Formation:Hamra Beds
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology: "limestone"
Secondary lithology: "reef rocks"
Lithology description: Ref. 11073: "Hamra/Sundre Beds (50m): The oolitic limestones of the upper Burgsvik Beds pass into oncolites with bioclasts of normal marine fauna. At Hoburgen, in the SW part of Gotland, these are overlain by a series of massive bioherms surrounded and covered by detritic and coarse crinoidal limestones (Sundre Beds). To the NE these platform deposits are replaced by micritic and argillaceous limestones with back reef character and often with an impoverished benthic fauna. Southwards, the carbonate platform of Hoburgen passes into a shelf basin area with the deposition of a limestone-marl sequence which then grades into off-reef shelf sediments ("Beyrichia Limestone") south of Gotland."
Environment:reef, buildup or bioherm
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Also known as:Reef 1800
Database number:13620
Authorizer:M. Foote Enterer:M. Foote
Modifier:U. Merkel Research group:marine invertebrate
Created:2002-04-16 11:11:05 Last modified:2008-03-25 08:26:38
Access level:the public Released:2002-04-16 11:11:05
Creative Commons license:CC BY
Reference information

Primary reference:
6128. A. A. Manten. 1971. Silurian Reefs of Gotland. Developments in Sedimentology 13:1-539 [M. Foote/M. Foote/P. Wagner]

Secondary references:

11073 C. Samtleben, A. Munnecke, T. Bickert and J. Paetzold. 1996. The Silurian of Gotland (Sweden): facies interpretation based on stable isotopes in brachiopod shells. Geologische Rundschau 85:278-292 [M. Foote/M. Foote/M. Foote]