Where: Algeria (27.5° N, 7.5° W: paleocoordinates 60.4° S, 20.5° E)
• coordinate estimated from map
• local area-level geographic resolution
When: Pridoli to Pridoli (423.0 - 391.9 Ma)
• "The brachiopod, trilobite, and graptolite fauna of this sandstone-shale part of the stratigrahpic column indicates that it is of Pridoli to Gedinne age and supports Gevin's (1960, p. 98) suggestion that the Silurian age deposits are continuous with those of Early Devonian age. He records Siegen and Emsian age sandstones stratigraphically above the probable Gedinne age beds. A conglomerate layer or an interval of conglomeratic sandstone occurs at the base of the Siegen age beds as well as in the interval of the Gedinne age beds."
• formation-level stratigraphic resolution
Environment/lithology: transition zone or lower shoreface; shale and sandstone
•SEP environmental call based on given info and regional context
Primary reference: 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]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 27456: authorized by Michael Foote, entered by Michael Foote on 06.12.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Trilobita | |
Dalmanites sp. Barrande 1852 trilobite | |
Acaste cf. spinosa trilobite
Acaste sp. Goldfuss 1843 trilobite
Acaste downingiae Murchison 1839 trilobite | |
Strophomenata | |
"Strophomena imbrex" = Megamyonia arethusa
"Strophomena imbrex" = Megamyonia arethusa Billings 1862 | |
Rhynchonellata | |
Tentaculitida indet. Ljaschenko 1955 | |
Bivalvia | |
Cardiola sp. Broderip 1839 clam | |
Cephalopoda | |
Orthocerida indet. Kuhn 1940 | |
Orthoceras sp. Breynius 1832 | |
Crinoidea | |
cf. Gennaeocrinus sp. Wachsmuth and Springer 1881 Sea lily | |
Pterobranchia | |
Monograptus sp. graptolite |