GGU 239919 - Ella Ø: Dyeran, Greenland
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Orthothecida
- Circothecidae
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Conotheca australiensis
Bengtson et al. 1990
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| see common names | |||||||
Geography
| Country: | Greenland |
| Coordinates: | 72.9° North, 25.0° West (view map) |
| Paleocoordinates: | 31.8° South, 50.0° West |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Cambrian | Epoch: | Series 2 |
| 10 m.y. bin: | Cambrian 2-3 | ||
| Key time interval: | Dyeran | ||
| Age range of interval: | 514.80000 - 511.00000 m.y. ago |
Stratigraphy
| Formation: | Bastion | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Bastion Fm, which overlies the Kløftelv Fm (lower Cambrian) and is overlain by the Ella Island Fm, and in turn the Hyolithus Creek Fm (lower-middle Cambrian) and Dolomite Point Fm (middle Cambrian). STRATIGRAPHIC POSITION: Presumably from the upper part of the Bastion Fm, though not stated (lower part appears devoid of fossiliferous horizons). AGE: Well constrained to the late Early Cambrian (Dyeran Age or Bonnia-Olenellus Chron; see Palmer 1998) by the presence of Olenellid trilobites (Poulson 1932, Cowie and Adams 1957) and baltisphaerid acritarchs (Vidal 1979). THICKNESS: Thickness of strata collection is derived from is not stated, but is assumed to be bed-scale; upper Bastion Fm is 60-70 m thick in thi section. | |||||
Lithology and environment
| Primary lithology: | lithified calcareous "shale" |
| Includes fossils? | Y |
| Lithology description: GENERAL LITHOLOGY: Dark shales with minor carbonate incursions. LITHIFICATION: Lithified, based on the figured specimens (encased in matrix). | |
| Environment: | offshore |
| Geology comments: ENVIRONMENT: Deposited below fair-weather wave base (Skovsted 2006). | |
Taphonomy
| Modes of preservation: | body,cast,mold/impression,original calcite,original silica,replaced with calcite,replaced with phosphate |
| Size of fossils: | macrofossils |
| Fragmentation: | frequent |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | bulk,chemical,acetic,sieve,field collection,survey of museum collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: COLLECTOR: Collected by S. Peel and M.P. Smith (1988), and earlier collectors. PREPARATION: Rock samples were dissolve in buffered 10 percent acetic acid to retrieve acid-resistent microfossils. The resulting residues were sieved and the heavy mineral fraction separated using sodium polytungstate. REPOSITORY: All specimens are housed in the Geological Museum in Copenhagen (MGUH) | |
| Taxonomic list comments:COVERAGE: Exhaustive for Brachiopoda. The residues of the acid-digested samples contain a well-preserved and diverse small shelly fauna including helcionellid molluscs, coelosclerites, lapworthellids, and problematic fossils. NOMENCLATURE: Authoritative publication, with occurrences identified to species resolution where possible and with modern nomenclature. | |
Metadata
| Database number: | 67778 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2006-12-09 11:49:19 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2006-12-09 11:49:19 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 19364. | C. B. Skovsted. 2006. Small shelly fauna from the upper Lower Cambrian Bastion and Ella Island Formations, North-East Greenland. Journal of Paleontology 80(6):1087-1112 [A. Hendy/A. Hendy] |