Brachiopod fauna of Hemse bioherm at Ljugarn, LU1 (Silurian of Sweden)

Where: Gotland, Sweden (57.3° N, 18.7° E: paleocoordinates 16.6° S, 2.2° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• bed-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified, shelly/skeletal limestone and lithified marl

• "The Hemse beds are a unit of biohermal limestone, bedded limestone, and marlstone about 100 m thick...At two areas [at Ljugarn] the rocks consist of in-place, coalescing stromatoporoid colonies, forming parallel, irregular layers which dip gently eastward. more extensive, surrounding outcrops contain more non-bedded stromatoporoid debris than in-place colonies. In addition to stromatoporoids, the debris deposits include algae, corals, crinoids, bryozoa, brachiopods, mollucs, trilobites, and ostracodes...[Compositional analysis of limestone given in some detail]."

Collection methods: This is one of several individual bed collections within 20 meters of one another.

Primary reference: R. Watkins. 1975. Silurian brachiopods in a stromatoporoid bioherm. Lethaia 8(1):53-61 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 65043: authorized by Linda Ivany, entered by Cristina Story on 18.09.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Does not include stromatoporoids, corals, crinoids, algae and microfossils.
Show authors, comments, and common names
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Rhynchonellata
 Spiriferida - Delthyrididae
Howellella elegans
Howellella elegans Muir-Wood 1925
 Atrypida - Atrypinidae
Spirigerina aff. quinquecostata
 Atrypida - Lissatrypidae
Lissatrypa sulcata
Lissatrypa sulcata Lindström 1861
 Orthida - Dalmanellidae
Dalmanellidae indet.
Dalmanellidae indet. Schuchert 1913
 Orthida - Dolerorthidae
Dolerorthidae indet.
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp.
Leptaena sp. Dalman 1828
 Orthotetida - Chilidiopsidae
? Morinorhynchus sp.
? Morinorhynchus sp. Havlicek 1965