Locality 13, Round Hill, Dictyonema beds (Ordovician of the United States)

Where: Box Elder County, Utah (41.5° N, 111.9° W: paleocoordinates 7.7° S, 80.8° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Garden City Formation, Canadian (485.4 - 457.3 Ma)

• 86 foot interval beginning at 508 feet above base of formation

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, fine-grained limestone and lithified conglomerate

• "Low ledges of aphanitic limestone, crystalline limestone, intraformational conglomerate, protruding through float and soil mantle."

Size class: macrofossils

Collected by R. J. Ross, Jr. in 1946-1947; reposited in the YPM

Primary reference: R. J., J.r. Ross. 1951. Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Yale Peabody Museum of Natural History Bulletin 6:1-161 [S. Finnegan/S. Finnegan/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 103918: authorized by Melanie Hopkins, entered by Melanie Hopkins on 03.02.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

• Description in measured section states that this interval contained a "complete trilobite assemblage from Zone 'J'" (p. 23). Taxonomic list taken from faunal list on p. 27-28.
Show authors, comments, and common names
Pterobranchia
 Dendroidea - Acanthograptidae
Dictyonema sp.
Dictyonema sp. Hall 1851 graptolite
Trilobita
 Asaphida - Asaphidae
"Kirkella sp." = Ptyocephalus
"Kirkella sp." = Ptyocephalus Agassiz 1843 trilobite