B-12 (Ordovician of the United States)

Also known as SF 479

Where: Millard County, Utah (38.9° N, 113.4° W: paleocoordinates 6.6° S, 85.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: B trilobite zone, House Limestone Formation, Skullrockian (485.4 - 478.6 Ma)

• IbexianSkullrockian

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified limestone

• carbonate ramp, above wave base
• muddy; grey; quartz-rich; rare chert nodules

Size class: macrofossils

Preservation: replaced with silica

Collected by L.F. Hintze

Collection methods: bulk,

Primary reference: L.F. Hintze. 1951. Lower Ordovician detailed stratigraphic sections for western Utah. Utah Geological and Mineralogical Survey Bulletin 39:99 p. [A. Miller/A. Miller]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 104163: authorized by Seth Finnegan, entered by Seth Finnegan on 07.02.2011, edited by Melanie Hopkins

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Aulacopleurida - Hystricuridae
"Hystricurus genalatus" = Genalaticurus genalatus
"Hystricurus genalatus" = Genalaticurus genalatus Ross 1951 trilobite
 Ptychopariida - Kingstoniidae
Clelandia utahensis Ross 1951 trilobite
 Asaphida - Asaphidae
Xenostegium franklinense Ross 1951 trilobite
Parabellefontia concinna Hintze 1952 trilobite
Bellefontia chamberlaini Clark 1935 trilobite