LACMIP 17160, LC 46.5, Gray Hills, northwest end of Lawson Cove, Wah Wah Mt (Cambrian of the United States)

Where: Millard County, Utah (38.7° N, 113.5° W: paleocoordinates 5.3° S, 88.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Saukiella junia trilobite zone, Hellnmaria Member (Notch Peak Formation), Sunwaptan (493.5 - 487.5 Ma)

• Figure 3

• formation-level stratigraphic resolution

Environment/lithology: dolomite

• Runnegar et al. (1979) presented several other lines of evidence suggesting a high energy, intertidal to subtidal depositional environment for the Hellnmaria Member. They documented the presence of cross-bedded dolomite sands and oncolites in addition to the domal stromatolites. Additionally, the valves of M. wahwahensis have no preferred orientation in the sediments, nor do they lie on horizontal bedding planes. Instead there is a variety of inclinations and declinations of the valves, and the dip of the long axis of the valve is often high. The random inclinations of the valves and the observation that all the valves recovered are disarticulated also support the argument for a relatively high energy depositional system.

Size classes: macrofossils, mesofossils

Preservation: replaced with silica

Reposited in the LACM

Collection methods: bulk, chemical,

Primary reference: M. J. Vendrasco and B. Runnegar. 2004. Late Cambrian and Early Ordovician stem group chitons (Mollusca: Polyplacophora) from Utah and Missouri. Journal of Paleontology 78(4):675-689 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 94564: authorized by Pete Wagner, entered by Pete Wagner on 28.02.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Polyplacophora
 Paleoloricata - Mattheviidae
Matthevia wahwahensis
Matthevia wahwahensis Vendrasco and Runnegar 2004 chiton