Etherington Fm, Mount Head Area, Alberta: Chesterian, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Pectinida - Pectinidae
Pecten sp. Müller 1776
Rhynchonellata - Athyridida - Athyrididae
Composita subquadrata (Hall 1858)
Composita trinuclea (Hall 1856)
Cleiothyridina sp. Buckman 1906
Cleiothyridina sublamellosa (Hall 1858)
Rhynchonellata - Athyridida - Retziidae
Eumetria sp.
Rhynchonellata - Spiriferida - Spiriferidae
Spirifer leidyi Norwood and Pratten 1855
Spirifer increbescens Hall 1858
Rhynchonellata - Rhynchonellida - Camarotoechiidae
Camarotoechia sp. Hall and Clarke 1893
Rhynchonellata - Terebratulida - Cranaenidae
Girtyella sp. Weller 1911
unclassified
Parallelidon sp.
Strophomenata - Productida - Linoproductidae
"Linoproductus ovatus (Hall 1858)
Strophomenata - Productida - Productidae
Dictyoclostus sp. Muir-Wood 1930
Strophomenata - Orthotetida - Orthotetidae
Orthotetes kaskaskiensis (McChesney 1860)
Stenolaemata - Cryptostomata - Fenestellidae
Archimedes sp.
see common names

Geography
Country:Canada State/province:Alberta
Coordinates: 50.4° North, 114.6° West (view map)
Paleocoordinates:8.5° North, 37.2° West
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period: Carboniferous Epoch: Mississippian
10 m.y. bin: Carboniferous 2-3
Key time interval: Chesterian
Age range of interval: 335.8 - 323.2 m.y. ago
Stratigraphy
Geological group:Rundle Formation:Etherington
Stratigraphic resolution:formation
Lithology and environment
Primary lithology:fine,medium lithified sandy dolomite
Secondary lithology:"cross stratification",fine,medium lithified sandy,cherty/siliceous "limestone"
Lithology description: Three members of the formation are described but the faunal list does not indicate where the fossils were collected. From table V: "Lower Part: Green Shale; cryptocrystalline to finely crystalline and fine-grained limestone and dolomite. Middle Part: Fine to medium-grained, cherty arenaceous and medium-crystalline limestone; medium-crystalline, porous dolomite. Upper Part: Fine-grained, arenaceous dolomite, cryptocrystalline and finely crystalline dolomite, chert nodules." From text: "The lower part of the Rtherington formation consists of five cyclical alternations of green shale and carbonate rocks. The shales form the basal parts fo the unit, being thick and fisile in the lower two units and interbedded with thin limestone and dolomite in the upper units. The upper parts of the units are massive-bedded carbonate, split by more agrillaceous bands of shale. The middle par the the Etheringont formation in the southern and central parts of the Mount Head area contains finely laminated, cross bedded, cherty arenaceous limestone overlin by medium-crystalline dolomite and dolomitic limestone. Thin green shales and mre argillaceous beds are interclated in the lower beds. In the north, on Flat Creek, the middle part consists of several thick beds of medium- to coarsely crystalline limestonse which grade upward into finely crystalline limestone and dolomite. The beds are arenaceous, the quarts grains being coarser and more abundant in the base. The upper part of the Ethington formation consists of fine- to medium- frained dolomite, massive bedded, finely arenaceous and cherty, and cryptocrystalline to finely crystalline cherty dolomite. The quartz content of these beds in considerably greater and the grains larger in the north and northwest parts of the area than in the remainder."
Environment:deep subtidal indet.
Taphonomy
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Database number:62329
Authorizer:N. Heim Enterer:N. Heim
Research group:marine invertebrate
Created:2006-07-18 14:13:21 Last modified:2006-07-18 17:13:21
Access level:the public Released:2006-07-18 14:13:20
Creative Commons license:CC BY
Reference information

Primary reference:
18020. R. J. W. Douglas and P. Harker. 1958. Mississippian succession in Mount Head area, Alberta. Jurassic and Carboniferous of Western Canada 177-189 [N. Heim/N. Heim]