Also known as Are 31
Where: Jujuy, Argentina (23.5° S, 65.3° W: paleocoordinates 44.8° S, 128.8° W)
• coordinate based on unpublished field data
• small collection-level geographic resolution
When: Rupasca Member (Santa Rosita Formation), Tremadocian (485.4 - 477.7 Ma)
• bed-level stratigraphic resolution
Environment/lithology: transition zone or lower shoreface; lithified, silty, sandy siliciclastic sediments and lithified, muddy siliciclastic
•grained sandstone forming amalgamated packages. Individual sandstone beds generally pinch out, but bedsets are laterally persistent. Thin mudstone part-
•ings are locally present. Gutter casts, load casts, ball-and-pillow structures and tool marks are common, while wrinkle marks are present locally. Physical sedimentary structures in these deposits indicate episodic storm wave activity, and wave-generated surges(Buatois & Mangano 2003; Buatois et al. 2006). High-energy oscillatory, and combined flows were the dominant processes during frequent storms. Flows were strongly erosive, and characterized by rapid
•influx of sand. Recurrent storms and continuous wave agitation during fair-weather removed most of the finer-grained particles, leaving only thin mudstone
•partings between sand units. These deposits are typified as strongly storm-dominated shorefaces (sensu MacEachern & Pemberton 1992).
Size classes: macrofossils, mesofossils
Preservation: cast, mold/impression
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 136939: authorized by Diego Balseiro, entered by Diego Balseiro on 07.12.2012
Creative Commons license: CC BY (attribution)
Taxonomic list
| Trilobita | |
|
Apatokephalus sp. Brögger 1896 trilobite | |
|
Asaphellus sp. Callaway 1877 trilobite | |
|
Leptoplastides sp. Raw 1908 trilobite | |