PBDB Collection

Mississippian Fossils, Illipah Formation, Northern Needle Range (Carboniferous to of the United States)

Where: Millard County, Utah (38.7° N, 114.0° W: paleocoordinates 1.9° S, 48.8° W)

• coordinate estimated from map

When: Illipah Formation, Carboniferous to Carboniferous (358.9 - 323.2 Ma)

• The contact with the underlying Chainman Shale is places at the base of the red weathering limestones. The top of the brown crinoidal limestones, or whenever exposed, the top of the red-maroon sandstones form the contact with the overlying Pennsylvanian Ely Limestone

Environment/lithology: shelly/skeletal, black, yellow, sandy limestone

• The writer has divided the formation into three units. The lower unit consists of thin bedded, black, sandy-limestone. The most outstanding feature of this formation, especially the lower unit, is the brick red and yellow ochre colors of the weathered limestones. Upward in the section, the limestones become medium bedded, form step ledges and slopes, and weather medium grey. The upper most unit consists of medium bedded crinoidal limestones which weather yellow-brown to brown. Throughout the upper unit partially silicified fossils are abundant and tend to weather free. Red and maron sandstones and quartzites are commonly exposed above the crinoidal limestones. The sands consist of quartz grains, sub-rounded to rounded, medium to coarse in size.

Primary reference: W. J. Gould. 1959. Geology of the Northern Needle Range Millard County, Utah. Brigham Young University Research Studies, Geology Series 6(5):1-47 [T. Olszewski/M. Gibson/L. Fall]more details

PaleoDB collection 13363: authorized by Tom Olszewski, entered by Melissa Gibson on 10.03.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

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unclassified
-	Cliothyridina orbicularis, Paleococrinus sp. Cliothyridina orbicularis Paleococrinus sp.
Lingulata
Lingulida - Discinidae	Orbiculoidea missouriensis, Orbiculoidea capuliformis Orbiculoidea missouriensis Shumard 1858 Orbiculoidea capuliformis McChesney 1859
Strophomenata
Productida -	Marginifera sp. Marginifera sp. Waagen 1884
Productida - Productidae	"Dictyoclostus americanus" = Reticulatia americana, Dictyoclostus inflatus, Dictyoclostus burlingtonensis "Dictyoclostus americanus" = Reticulatia americana Dunbar and Condra 1932 Dictyoclostus inflatus McChesney 1860 Dictyoclostus burlingtonensis Hall 1858
Productida - Productellidae	"Dictyoclostus portlockianus" = Antiquatonia portlockianus, "Dictyoclostus portlockianus" = Antiquatonia portlockianus "Dictyoclostus portlockianus" = Antiquatonia portlockianus Norwood and Pratten 1855 "Dictyoclostus portlockianus" = Antiquatonia portlockianus Norwood and Pratten 1855 n. var. crassicostatus (Dunbar and Condra)
Productida - Echinoconchidae	"Diaphragmus elegans" = Echinoconchus elegans, Juresania nebraskensis "Diaphragmus elegans" = Echinoconchus elegans Norwood and Pratten 1855 Juresania nebraskensis
Productida - Linoproductidae	Linoproductus ovatus Linoproductus ovatus Hall 1858
Orthotetida - Derbyiidae	Derbyia sp. Derbyia sp. Waagen 1884
Strophomenida - Rugosochonetidae	"Chonetes granulifer" = Neochonetes granulifer "Chonetes granulifer" = Neochonetes granulifer Owen 1852
Rhynchonellata
Spiriferida - Spiriferidae	"Spirifer leidyi" = Anthracospirifer leidyi, "Spirifer occidentalis" = Anthracospirifer occiduus, Spirifer rockymountanus "Spirifer leidyi" = Anthracospirifer leidyi Norwood and Pratten 1855 "Spirifer occidentalis" = Anthracospirifer occiduus Sadlick 1960 Spirifer rockymountanus
Spiriferida - Trigonotretidae	"Neospirifer triplicatus" = Neospirifer dunbari "Neospirifer triplicatus" = Neospirifer dunbari King 1933
Athyridida - Athyrididae	Composita trilobata, Composita subtilita, Composita ovata Composita trilobata Composita subtilita Hall 1852 Composita ovata Mather 1915
Athyridida - Retziidae	Eumetria acuticosta Eumetria acuticosta
Spiriferinida - Punctospiriferidae	"Punctospirifer kentuckyensis" = Punctospirifer kentuckensis "Punctospirifer kentuckyensis" = Punctospirifer kentuckensis Shumard 1855
Rhynchonellida - Wellerellidae	Wellerella (cf. Wellerella) osagensis Wellerella (cf. Wellerella) osagensis Shumard and Swallow 1858
Rhynchonellida - Petasmariidae	Pugnoides sp. Pugnoides sp. Weller 1910
Orthida - Schizophoriidae	Schizophoria sp. Schizophoria sp. King 1850
Orthida - Rhipidomellidae	Rhipidomella sp. Rhipidomella sp.
Stenolaemata
Rhabdomesida - Rhomboporidae	Rhombopora sp. Rhombopora sp. Meek 1872
Cryptostomata - Fenestellidae	Archimedes sp. Archimedes sp.
Bivalvia
Pholadomyida - Edmondiidae	Allorisma sp. Allorisma sp. King 1844 clam
Trilobita
Proetida - Phillipsiidae	Phillipsia sp. Phillipsia sp. Portlock 1843 trilobite