Early Pennsylvanian Fossils from Ely Limestone San Francisco Mnts, Western Utah (Carboniferous of the United States)

Where: Utah (38.5° N, 113.3° W: paleocoordinates 3.3° S, 49.0° W)

• outcrop-level geographic resolution

When: Mississippian (358.9 - 323.2 Ma)

• The Ely Limestone is overlain unconformably by Tertiary volcanic rocks and is overthrust by a small sliver of Mississipian rocks north of the highway.

Environment/lithology: limestone and pebbly, conglomeratic dolomite

• This section most closely resembles the Pennsylvanian Ely Limestone of Nevada.
• The Ely Limestone is chiefly limestone and secondary dolomite, with interbedded quartzite and chert-pebble conglomerate. On the south side of the highway, the lower part of the section is gray, medium-bedded dolomite with nodular chert. There is a 20-30 foot section that contains a 1-4 foot ledge of fossiliferous chert-pebble conglomerate. Above this, is a fossiliferous, light gray, thin to medium bedded dolomite which weathers dark brown. In places, the bedding is almost laminated with with white chert layers. This is overlain by a thrust zone, followed by a light gray, finely crystalline, cherty, fossiliferous, massive-weathering limestone. The quartzite is absent in the section on the south side of the highway. The north side of the highway contains all of that previously described, but above the dolomites is a dark brown very well-indurated massive-bedded quartzite. The quartzite is followed by a gray, finely crystalline, medium-to thick-bedded fossiliferous limestone.

Primary reference: E. H. E. East. 1965. Structure and Stratigraphy of San Francisco Mountains, Western Utah. Bulletin of the American Association of Petroleum Geologists 50(5):901-920 [T. Olszewski/M. Gibson]more details

PaleoDB collection 12344: authorized by Tom Olszewski, entered by Melissa Gibson on 28.10.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• Also included in the list are crinoid ossicles and a possible gastropod fragment.
Strophomenata
 Productida - Echinoconchidae
Juresania ? sp. Fredericks 1928
 Productida - Productidae
Dictyoclostus sp., "Dictyoclostus cf. americanus" = Reticulatia americana
"Dictyoclostus cf. americanus" = Reticulatia americana Dunbar and Condra 1932
 Productida - Linoproductidae
 Orthotetida - Orthotetidae
Orthotetes ? sp.
Might also be Derbya sp.
Rhynchonellata
 Athyridida - Athyrididae
Composita sp. Brown 1849
Composita cf. ovata Mather 1915
Composita ovata Mather 1915
 Terebratulida - Dielasmatidae
 Spiriferinida - Punctospiriferidae
 Spiriferida - Spiriferidae
"Spirifer occidentalis" = Anthracospirifer occiduus Sadlick 1960
Spirifer sp. Sowerby 1818
Spirifer opimus Hall 1858
Stenolaemata
 Trepostomida - Stenoporidae
Anthozoa
 Stauriida - Hapsiphyllidae
"Triplophyllites sp." = Amplexizaphrentis
"Triplophyllites sp." = Amplexizaphrentis Vaughan 1906 horn coral
 Stauriida - Cyathopsidae
Caninia sp. Michelin 1840 horn coral