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Huab Basin amphibian locality (Permian to of Namibia)

Also known as Damaraland, Karroo, Karoo

Where: Erongo, Namibia (20.7° S, 14.2° E: paleocoordinates 49.1° S, 25.3° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Gai-As Formation ("Ecca" Group), Kungurian to Kungurian (279.5 - 268.0 Ma)

• "Within the uppermost Gai-As Formation, close to its transitional contact with the Doros Formation, [...] 14 m below a conspicuous fallout tuff horizon which provides our age control [...] " (Warren et al., 2001).

•Note: In the stratigraphic column in fig. 3 of Warren et al. (2001) a siltstone bed in the middle part of the Gai-As Fm. is labelled with "Stereospondylous amphibian" which is contradictory to the statement in the above cited text.

•"Recent U/Pb SHRIMP dating of zircons from two of several fallout tuff beds in the Gai-As Formation 14 m above the stereospondyl find gave weighted mean values of 272+/-1.8 Ma and 265+/-2.5 Ma (Wanke, in prep.), both equivalent to late Early Permian (cf. Ross et al., 1994; Haq and Eysinga, 1998)." (Warren et al., 2001). According to the time scales of Gradstein et al. (2004) and Ogg et al. (2008) the ages obtained from the ash beds correspond to an interval spanning the Kungurian to the lowest Capitanian. Given that the finding horizon is considerably below the dated ash bed, the collection is assigned to the Kungurian and Roadian (TL).

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine; tabular, brown, red, silty mudstone

• "After Whitehill deposition the Huab Basin became more restricted with the rejuvenation of northerly trending marginal rift faults, resulting in the more closely confined lacustrine-mud deposition of the the Gai-As Formation." (Warren et al., 2001).
• The Gai-As Fm. is said to generally consist of "plane bedded, pink and maroon mudrocks" (Warren et al., 2001).

Size class: macrofossils

Collection methods: fossils are reposited in the collections of the Geological Survey of Namibia (GSN)

Primary reference: A. A. Warren, B. S. Rubidge, I. G. Stanistreet, H. Stollhofen, A. Wanke, E. M. Latimer, C. A. Marsicano and R. J. Damiani. 2001. Oldest Known Stereospondylous Amphibian from the Early Permian of Namibia. Journal of Vertebrate Paleontology 21(1):34-39 [J. Mueller/T. Liebrecht] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 90437: authorized by Johannes Mueller, entered by Torsten Liebrecht on 21.07.2009

Creative Commons license: CC BY (attribution)