Huas. 26 (Ordovician of Argentina)

Where: Jujuy, Argentina (23.6° S, 65.3° W)

• Paleocoordinates: 31.1° S, 162.7° W (Wright 2013)

• coordinate estimated from map

• small collection-level geographic resolution

When: Rupasca Member (Santa Rosita Formation), Tremadocian (486.9 - 477.1 Ma)

Environment/lithology: basinal (); lithified, argillaceous siliciclastic sediments

• Shelf deposits consist of black, thinly parallel laminated shale. Shale units are laterally extensive, displaying sharp bases. Bioturbation is absent. This facies records deposition below storm-wave base in a low-energy environment due to suspension fall-out deposition in the absence of waves and currents (Buatois & Mangano 2003; Buatois et al. 2006). Absence of bioturbation indicates dominantly anoxic conditions at the sediment-water interface. However, oxygenation events leading to the establishment of periods of dysaerobic waters are indicated by the local presence of benthic fauna.

Size classes: macrofossils, mesofossils

Preservation: cast

Collected by N.E. Vaccari

Collection methods: bulk,

Primary reference: D. Balseiro, B. G. Waisfeld, and L. A. Buatois. 2011. Unusual trilobite biofacies from the Lower Ordovician of the Argentine Cordillera Oriental: new insights into olenid palaeoecology. Lethaia 44:58-75 [D. Balseiro/D. Balseiro]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 136946: authorized by Diego Balseiro, entered by Diego Balseiro on 07.12.2012

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Artiopoda
 Olenida - Olenidae
Leptoplastides sp., Parabolinella sp., Bienvillia sp.
Leptoplastides sp. Raw 1908 trilobite
Parabolinella sp. Brögger 1882 trilobite
Bienvillia sp. Clark 1924 trilobite
 Agnostida -
Agnostina indet.
Agnostina indet. Salter 1864 artiopod