Blahall 1, Gotland, Halla biostrome (Silurian of Sweden)

Also known as Reef 1802

Where: Sweden (57.3° N, 18.2° E: paleocoordinates 20.0° S, 2.6° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Mulde Brick-clay Member (Halla Formation), Homerian (430.5 - 427.4 Ma)

• bed-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified bafflestone

• 0.3-0.5 m thick low diversity halysitid-heliolitid autobiostrome on the seaward slope of the carbonate platform

Size class: macrofossils

Collection methods: peel or thin section,

Primary reference: M. Calner, O. Sandström, and M. A. Motus. 2000. Significance of a halysitid-heliolitid mud-facies autobiostrome from the Middle Silurian of Gotland, Sweden. Palaios 15:511-523 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 77538: authorized by Wolfgang Kiessling, entered by Uta Merkel on 15.01.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

Anthozoa
 Heliolitida - Halysitidae
 Heliolitida - Stelliporellidae
 Favositida - Favositidae
Favosites gothlandicus Lamarck 1816 tabulate coral
 Stauriida - Ptenophyllidae
 Stauriida - Ketophyllidae
 Stauriida - Arachnophyllidae
Arachnophyllum murchisoni Edwards and Haime 1851 horn coral
 Stauriida - Entelophyllidae
 Cystiphyllida - Tryplasmatidae