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Aar Farm (Ediacaran of Namibia)

Where: Southwestern Namibia , Namibia (26.7° S, 16.3° E: paleocoordinates 41.7° S, 175.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Nama other zone, Kliphoek Member (Dabis Formation), Ediacaran (635.0 - 542.0 Ma)

• The sandstone unit is part of the Kliphoek Member of the Dabis Formation, Kuibis Subgroup, Nama Group (terminal Proterozoic-Cambrian).

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, graded, sandy sandstone and lithified, flat-pebble, gray, muddy mudstone

• planar laminated sheet sandstone with graded bedding, and samples three event beds, each having variable (4050 mm)thickness. Their lower bedding planes are erosional and preserve flat clay pebbles, which are chip-shaped rather than compressed mud balls, recognized by the occurrence of inclined axes. These chips consist of maroon and grey mudstone and may reach 18mm in diameter. Rather than being contained to a sharp bedding plane, they float within the lowermost sandy matrix and are interpreted as a lag deposit of a turbidite-like flow. Kliphoek Member sandstone in general records strong current influence and may be fluvial in origin (Germs 1983; Saylor et al. 1995). Each bed contains a succession of two distinct assemblages of Pteridinium, interpreted as winnowed and virgin (undisturbed).

Size class: macrofossils

Preservation: mold/impression

Collection methods: The original material is deposited in the Geological Survey of Namibia (Windhoek) and catalogued under numbers F576-622. The cast material is deposited in the Institut fur Geologie und Palaontologie (Tubingen) and catalogued under number GPIT1856.

Primary reference: D. Grazhdankin and A. Seilacher. 2002. Underground Vendobionta from Namibia. Palaeontology 45(1):57-78 [M. Laflamme/M. Laflamme] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 89796: authorized by Marc Laflamme, entered by Marc Laflamme on 12.06.2009

Creative Commons license: CC BY (attribution)