Hjalmsater-Trolmen, Mickwitzia S.stone, Sweden - Jensen and Soren 1990: Atdabanian, Sweden

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Hyolithelminthida - Torellellidae
Aglaspidida - Strabopidae
Mickwitziidae
Mickwitzia monilifera (Linnarsson 1869)
Salterellidae
Volborthella tenuis Schmidt 1888
Mobergellidae
Mobergella sp. Herdström 1923
unclassified
Cruziana sp. d'Orbigny 1842
Diplocraterion sp. Torell 1870
Teichichnus sp. Seilacher 1955
see common names

Geography
Country:Sweden
Coordinates: 58.6° North, 13.3° East (view map)
Paleocoordinates:19.2° South, 96.5° West (Wright 2013)
Geographic resolution:local area
Time
Period: Cambrian Epoch: Series 2
Stage: Stage 3 10 m.y. bin: Cambrian 2
*Period:Early/Lower Cambrian - Middle Cambrian *Epoch:Caerfai
*International age/stage:Atdabanian
Key time interval: Atdabanian Zone:  Schmidtiellus mickwitzi or Holmia inusitata
Age range of interval: 521 - 515.6 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Mickwitzia Sandstone
Stratigraphic resolution:formation
Stratigraphy comments: The formation reaches a thickness of about 10m.
Lithology and environment
Primary lithology:wave ripples,tool marks lithified sandstone
Secondary lithology: claystone
Lithology description: fine-grained, hard, locally mica-rich sandstone with thin layers of grey-green argillaceous material. Ripples, dragmarks, and mudcracks present.
Environment:shoreface
Taphonomy
Modes of preservation:cast,trace
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:paleoecologic analysis
Collection method comments: 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.
Taxonomic list comments: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.
Metadata
Database number:9878
Authorizer:M. Patzkowsky Enterer:P. Borkow
Research group:marine invertebrate
Created:2001-01-29 12:01:00 Last modified:2025-02-22 15:12:02
Access level:the public Released:2001-01-29 12:01:00
Creative Commons license:CC0
Reference information

Primary reference:
858. 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]