Probable Gamka Formation (1st Sandstone), Gamka Poort (Devonian of South Africa)

Where: South Africa (33.3° S, 21.6° E: paleocoordinates 61.1° S, 153.7° W)

• coordinate stated in text

• local area-level geographic resolution

When: Gamka Formation (Bokkeveld Group), Late/Upper Emsian (402.5 - 391.9 Ma)

• Latest Emsian. Age call from ref. 9618. Oosthuizen says this is "probable Gamka Fmn"

• formation-level stratigraphic resolution

Environment/lithology: marine; fine-grained, medium, intraclastic sandstone

• Ref. 9618 gives interpretation of Bokkeveld Group as a series of shallowing-upward packages, with argillaceous unit below and arenaceous unit above. The shallowing upward sequence is interpreted as representing environments from the shelf up to deltaic systems. Most fossils come from lower mudstones, often in lenses.
• Ref. 9616 refers only to "sandstone". Ref. 9617, for formation as a whole, cites "Sandstone, fine- to medium-grained, thin- to thick- bedded, parallel laminated, planar cross-bedded, thin intraclast lenses, fossiliferous lenses"

Primary reference: R. D. F. Oosthuizen. 1984. Preliminary catalogue and report on the biostratigraphy and palaeogeographic distribution of the Bokkeveld fauna. Transactions of the Geological Society of South Africa 87:125-140 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 35600: authorized by Michael Foote, entered by Michael Foote on 30.12.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Crinoidea indet. Miller 1821 Sea lily
 Diplobathrida -
 Spiriferida - Hysterolitidae
 Rhynchonellida - Leptocoeliidae