Shale Near Beni Afeur, Petite Kabylie, NE Algeria: Llandovery - Pridoli, Algeria

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Orthocerida - Orthoceratidae
Orthoceras sacrum
Orthoceras decipiens
Orthoceras morresi
Tentaculitida - Tentaculitidae
Tentaculites acuarius
Pterobranchia - Graptoloidea - Monograptidae
Rastrites longispinus
Rastrites approximatus
Rastrites peregrinus
Monograptus convolutus (Hisinger 1837)
recombined as Lituigraptus convolutus
Monograptus communis
Monograptus intermedius
see common names

Geography
Country:Algeria
Coordinates: 36.3° North, 5.0° East (view map)
Paleocoordinates:72.6° South, 57.4° East
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Silurian
*Epoch:Llandovery - Pridoli
Key time interval:Llandovery - Pridoli
Age range of interval:443.80000 - 419.20000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Stratigraphy comments: Lower part of sequence inferred to be Llandovery on basis of graptolites. Orthocerids said to come from near top of exposures, but no age call is made for these. Based on collections 27153 and 27154, the upper parts of sequence may well be Ludlow in age.
Lithology and environment
Primary lithology: sandy "shale"
Secondary lithology:micaceous "shale"
Includes fossils?Y
Includes fossils?Y
Lithology description: "sandy shale near the base...micaceous shale stratigraphically higher"
Environment:transition zone/lower shoreface Tectonic setting:passive margin
Geology comments: Some 500km N of Pridoli shoreline and 1000km N of Llandovery shoreline, according to paleogeographic map of ref. 7455. "The Silurian shale rests on gneiss and is in an area of Oligocene age exposures."
SEP environmental call based on given info and regional context
Taphonomy
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:27445
Authorizer:M. Foote Enterer:M. Foote
Modifier:S. Peters Research group:marine invertebrate
Created:2002-12-06 05:06:56 Last modified:2003-05-14 13:54:42
Access level:the public Released:2002-12-06 05:06:56
Creative Commons license:CC BY
Reference information

Primary reference:
7455. W. B. N. Berry and A. J. Boucot. 1973. Correlation of the African Silurian rocks. Geological Society of America Special Paper 147:1-83 [M. Foote/M. Foote/M. Foote]