Hjalmsater-Trolmen, Mickwitzia S.stone, Sweden - Jensen and Soren 1990 (Cambrian of Sweden)

Where: Sweden (58.6° N, 13.3° E: paleocoordinates 41.8° S, 27.0° W)

• local area-level geographic resolution

When: Schmidtiellus mickwitzi or Holmia inusitata zone, Mickwitzia Sandstone Formation, Atdabanian (520.0 - 516.0 Ma)

• The formation reaches a thickness of about 10m.

• formation-level stratigraphic resolution

Environment/lithology: shoreface; lithified sandstone and claystone

• fine-grained, hard, locally mica-rich sandstone with thin layers of grey-green argillaceous material. Ripples, dragmarks, and mudcracks present.

Preservation: cast, trace

Collection methods: The material studied is from collections in the Swedish Museum of Natural History, Stockholm (SMNH); the Geological Survey of Sweden, Uppsala; the Department of Historical Geology and Paleontology, University of Lund; the private collecitons of Jan Johansson, Skillersta and Karlsson, Hjalmsater, and Jensen's own field work. Since the individual specimen counts for the previosuly listed collections are not given, the collections are grouped according to locality.

Primary reference: S. Jensen. 1990. Predation by early Cambrian trilobites on infaunal worms - evidence from the Swedish Mickwitzia Sandstone. Lethaia 23(1):29-42 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 9878: authorized by Mark Patzkowsky, entered by Phil Borkow on 29.01.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• Although supposed trace fossils caused by trilobites have been found in the Mickwitzia Sandstone, the trilobites have yet to be found in the formation. However, 6 species of olenellaceans have been described from biostratigraphically correlative beds.
 Aglaspida - Paleomeridae
  - Mickwitziidae
 Hyolithelminthida - Torellellidae
Torellella laevigata Linnarsson 1871
  - Mobergellidae
Mobergella sp. Herdström 1923
  - Salterellidae
Volborthella tenuis Schmidt 1888
 Ichnofossils -
Cruziana sp. d'Orbigny 1842
Teichichnus sp. Seilacher 1955
Diplocraterion sp. Torell 1870