Voorstehoek Formation (2nd Shale), Matroosberg (Devonian of South Africa)

Where: South Africa (33.5° S, 19.8° E: paleocoordinates 64.8° S, 154.4° W)

• coordinate stated in text

• local area-level geographic resolution

When: Voorstehoek Formation (Bokkeveld Group), Eifelian (393.3 - 387.7 Ma)

• Lowest Eifelilan. Age call from ref. 9618.

• formation-level stratigraphic resolution

Environment/lithology: marine; bioturbated siltstone and bioturbated, silty mudstone

• Ref. 9618 gives interpretation of Bokkeveld Group as a series of shallowing-upward packages, with argillaceous unit below and arenaceous unit above. Voorstehoek Formation is the "second shale", i.e. the second argillaceous unit. 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 "shale". Ref. 9617, for formation as a whole, cites "Siltstone, silty mudstone, parallel-laminated, massive, horizontal, ripple- and micro cross laminated, abundant ripple-marks, bioturbation, 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 35592: authorized by Michael Foote, entered by Michael Foote on 30.12.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Phacopida - Calmoniidae
 Phacopida - Homalonotidae
 Serpulimorpha -
 Cardiidia - Grammysiidae
 Pholadomyida -
 Protobranchia - Malletiidae
 Oegophiurida - Protasteridae
"Drepanaster" sp. Whidborne 1898 brittle star
Eugasterella africana n. sp. Jell and Theron 1999 brittle star
Strataster stuckenbergi Rilett 1971 brittle star
"Echinasterella" sp. Stürtz 1890
 Platyasterida - Urasterellidae
Ulrichaster macrodentatus n. sp. Jell and Theron 1999 sea star
 Blastoidea -
 Fissiculata -
Pachyblastus dicki Breimer and Macurda 1972
 Mitrata -
Crinoidea indet. Miller 1821 Sea lily
 Dendrocrinida - Rutkowskicrinidae
Sacrinus gamkaensis n. gen. n. sp.
Sacrinus gamkaensis n. gen. n. sp. Jell and Theron 1999 Sea lily
 Tentaculitida - Tentaculitidae
 Productida - Chonetidae
? Notiochonetes sp.
listed as "Chonetes" sp. (a) (Notiochonetes)
? Notiochonetes hallei
listed as "Chonetes" hallei (Notiochonetes) Clarke
 Orthotetida - Pulsiidae
 Athyridida - Meristellidae
 Terebratulida - Centronellidae
 Spiriferida - Hysterolitidae
 Lingulida - Disciniidae
 Lingulida - Lingulidae
"Lingula lepta" = Dignomia lepta Clarke 1912
Lingula "sp. (a)" Bruguiére 1797
 Conulariida - Conulariidae
Conularia sp. jellyfish