Echinoids of the Hemse Group on Gotland (Silurian to of Sweden)

Where: Gotland, Sweden (57.5° N, 18.4° E: paleocoordinates 17.1° S, 2.5° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Hemse Beds Formation, Gorstian to Gorstian (427.4 - 423.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; carbonate and marl

• Ref. 11073: "Hemse Beds (90m): In the eastern part of Gotland reef mounds and biodetritic limestones formed a carbonate platform, similar to that of the Klinteberg Beds, but not extending so far to the west....In this area shallow marine carbonate formations make up the majority of the Hemse Beds. The intensively bioturbated, pellet-rich micritic limestones with a restricted marine fauna were probably deposity in a sheltered bay...These are overlain by extensive stromatopore biostromes with abrasion surfaces and intrasilurian sea stacks which show several episodes of erosion and emersion. To the west the carbonate platform borders on a shelf basin area where micritic limestone marl-alternations were deposited. Higher up in the section these "Hemse Marls" expanded to the east and covered the major portion of the area..."

Primary reference: G. Regnell. 1956. Silurian echinoids from Gotland. Arkiv for Mineralogi och Geology 2(7):155-178 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13721: authorized by Michael Foote, entered by Michael Foote on 22.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Echinoidea
  -
Echinoidea indet. Leske 1778 sea urchin
  - Archaeocidaridae
Silurocidaris clavata n. gen. n. sp.
Silurocidaris clavata n. gen. n. sp. sea urchin