Where: Millard County, Utah (38.8° N, 113.5° W: paleocoordinates 5.1° S, 88.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Lava Dam Member (Notch Peak Formation), Millardan (497.0 - 485.4 Ma)

• STRATIGRAPHIC RELATIONS: Hintze et al. (1988) divided the Notch Peak Fm into the Hellnmaria, Red Tops, and Lava Dam members, in an upward sequence. THICKNESS: The Lava Dam Mbr has a thickness of 89.3 m (293 ft). AGE: No trilobites collections are documented from the lower part of the Lava Dam Mbr, but it belongs to the Cambrooistodus minutus Subzone of the Eoconodonus Zone, conodont zonation scheme. Popov et al. (2002) places the lower Lava Dam Mbr into the Sunwaptan stage of the Milardan Series, of the Upper Cambrian.

• bed-level stratigraphic resolution

Environment/lithology: lithified, stromatolitic, shelly/skeletal, sandy, cherty/siliceous lime mudstone

Size class: macrofossils

Preservation: original phosphate

Reposited in the UNSM

Collection methods: chemical,

• COLLECTOR: J.F Miller. PREPARATION METHODS: Recovered by J.F. Miller from the heavy-liquid concentrations of insoluable residues of limestone conodont samples. REPOSITORY: USNM, NMW (National Museum of Wales), GLAHM (Hunterian Museum, Glascow), CNIGR (Central Scientific Geological Exploration Museum (Tschernyschev Museum), St Petersburg, Russia).

Primary reference: L.E. Popov, L.E. Holmer, and J.F. Miller. 2002. Lingulate brachiopods from the Cambrian-Ordovician boundary beds of Utah. Journal of Paleontology 76(2):211-228 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 62068: authorized by Austin Hendy, entered by Austin Hendy on 11.07.2006

Creative Commons license: CC BY (attribution)