Kallholn, Siljan District (Ordovician of Sweden)

Where: Dalarna, Sweden (61.2° N, 14.7° E: paleocoordinates 28.2° S, 7.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Boda Core Member (Boda Limestone Formation), Katian (453.0 - 445.2 Ma)

• These beds have been referred to as Upper Kallholn or Leptaena Limestone by earlier authors.

• formation-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; shelly/skeletal lime mudstone

• This formation consists of a number of isolated fossiliferous carbonate lenses, which have been referred to previously as organic reefs. Recent studies (Jaanusson in Ross et al., 1975, and Jaanusson, 1979) have shown, however, that no organic control or frame during the growth of these lenses can be recognized, and for this reason the term "car- bonate mounds" is deemed more suitable."

Size class: macrofossils

Preservation: cast, replaced with calcite

Collected by E. Warburg, among others

• PM = Swedish Museum of Natural History (Naturhistoriska Riksmuseet), Stockholm;

•PIU = Paleontological Institute of Uppsala

Primary reference: M. W. Frye. 1982. Upper Ordovician (Harjuan) Nautiloid Cephalopods from the Boda Limestone of Sweden. Journal of Paleontology 56(5):1274-1292 [B. Kröger/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89486: authorized by Björn Kröger, entered by Torsten Liebrecht on 25.05.2009, edited by Björn Kröger

Creative Commons license: CC BY (attribution)

Taxonomic list

• The specimens PIU D727 and D740 are listed among the material of Schuchertoceras troedssoni in the reference. It is stated that "Neither, however, is well enough preserved to be positively associated with Schuchertoceras troedssoni" but elsewhere it is stated that the specimens "compare favorably with the holotype of S. troedssoni in enough [...] respects to warrant at least tentative assignment to this species". Hence, the name of the taxon is spelled with a question mark previous to the specific epithet in the taxonomic list with regard to these specimens, although not spelled that way in the reference. The same applies to specimens assigned "with some reservation" to the newly described species.
Show authors, comments, and common names
Trilobita
 Phacopida - Cheiruridae
Holotrachelus punctillosus2
Holotrachelus punctillosus2 Törnquist 1884 trilobite
RM Ar. 45493; RM Ar. 47663, 2 specimen
 Proetida - Scharyiidae
Cyamops stensioei1
Cyamops stensioei1 Owens 1978 trilobite
 Proetida - Rorringtoniidae
Isbergia planifrons1, Isbergia parvula1
Isbergia planifrons1 Warburg 1925 trilobite
Isbergia parvula1 Warburg 1925 trilobite
Cephalopoda
 Ascocerida - Ascoceratidae
Schuchertoceras bodense n. sp., "Billingsites troedssoni n. sp." = Schuchertoceras troedssoni, "Schuchertoceras ? troedssoni" = Schuchertoceras troedssoni
Schuchertoceras bodense n. sp. Frye 1982
RM Mo 8757, 152301 (holotype) 152302; PIU D749 (paratype),
"Billingsites troedssoni n. sp." = Schuchertoceras troedssoni Foerste 1929
RM Mo 150151 (type)
"Schuchertoceras ? troedssoni" = Schuchertoceras troedssoni Foerste 1929
PIU D727, 740
 Multiceratoidea - Apsidoceratidae
Charactoceras triangulum n. sp., Charactoceras ? triangulum, Charactoceras suecicum n. sp., Charactoceras kallholnense n. sp., Charactoceras ? kallholnense, Charactoceras raettvikense
Charactoceras triangulum n. sp. Frye 1982
PIU D732 (type); RM Mo 152430
Charactoceras ? triangulum Frye 1982
RM Mo 9415
Charactoceras suecicum n. sp. Frye 1982
RM Mo 8739 (type)
Charactoceras kallholnense n. sp. Frye 1982
PIU D2, D10, D11, D733 (holotype); RM Mo 8735 (paratype), 150048, 152428, 152755; 1 specimen in the collections of the Geological Survey of Sweden
Charactoceras ? kallholnense Frye 1982
PIU lot D3 (2 specimens), D4, lot D6 (3 specimens), D8; RM Mo 8736
Charactoceras raettvikense Frye 1982
RM Mo 152429
 Lituitida - Lituitidae
Bodoceras torticoni n. gen. n. sp.
Bodoceras torticoni n. gen. n. sp. Frye 1982
RM Mo 8737 (paratype), 8743 (holotype)
 Lituitida - Sinoceratidae
Tyrioceras warburgae n. sp.
Tyrioceras warburgae n. sp. Frye 1982
PIU D 726 (type), 730, 742, 5 unnumbered PIU specimens; RM Mo 152749, 152750, 152758
1Owens 1978; 2Suzuki 2001