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

Also known as Reef 1800

Where: Gotland, Sweden (57.5° N, 18.4° E: paleocoordinates 16.5° S, 2.4° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Hamra Beds Formation, Ludfordian (425.6 - 423.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; limestone and reef rocks

• 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."

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 13620: authorized by Michael Foote, entered by Michael Foote on 16.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Strophomenida - Strophomenidae
Strophomena sp. Rafinesque and De Blainville 1824
"Strophomena" sp.
 Athyridida - Rhynchospirinidae
 Spiriferida - Cyrtiidae
Eospirifer sp. Schuchert 1913
 Pentamerida - Parastrophinidae
Anastrophia deflexa Sowerby 1839
 Atrypida - Atrypidae
 Rhynchonellida - Camarotoechiidae
 Orthida - Linoporellidae
Linoporella punctata deVerneuil 1848
 Orthida - Hesperorthidae
Dolerorthis rustica Sowerby 1839
 Mimospirida - Onychochilidae
"Oriostoma contrarium" = Onychochilus contrarium
"Oriostoma contrarium" = Onychochilus contrarium Lindström 1884
 Euomphalina - Platyceratidae
Platyceras disciforme Lindström 1884 snail
 Euomphalina - Oriostomatidae
"Poleumita globosum" = Oriostoma globosum
"Poleumita globosum" = Oriostoma globosum von Schlotheim 1820 snail
"Autodetus calyptratus" = Anticalyptraea
"Autodetus calyptratus" = Anticalyptraea
Cephalopoda indet. Cuvier 1797
 Orthocerida - Orthoceratidae
Orthoceras sp. Breynius 1832
 Ascocerida - Ascoceratidae
 Cystoporida - Fistuliporidae
Fistulipora sp. McCoy 1850
Crinoidea indet. Miller 1821 Sea lily
 Stromatoporoidea -
 Labechiida - Labechiidae
Labechia conferta Lonsdale 1839
 Syringostromatida - Syringostromatidae
Syringostroma sp. Nicholson 1865
 Stromatoporellida - Stromatoporellidae
Stromatoporella sp. Nicholson 1886
Anthozoa indet. Ehrenberg 1834
 Favositida - Favositidae
Favosites sp. Lamarck 1816 tabulate coral
Favosites gothlandicus Lamarck 1816 tabulate coral
 Heliolitida - Plasmoporidae
Plasmopora scita tabulate coral
 Heliolitida - Proporidae
Propora conferta tabulate coral
 Heliolitida - Heliolitidae
Heliolites sp. Dana 1846 tabulate coral
Heliolites barrandei Penecke 1887 tabulate coral
 Stauriida - Acervulariidae
Acervularia sp. Schweigger 1819 horn coral
 Stauriida - Cyathophyllidae
  - Solenoporaceae
Solenopora sp. Dybowski 1877
 Algae -