H-20 (Ordovician of the United States)

Where: Millard County, Utah (39.8° N, 113.5° W: paleocoordinates 7.2° S, 82.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Trigonocerca typica trilobite zone, 5 Member (Fillmore Formation), Blackhillsian (474.9 - 470.0 Ma)

• Zone H.

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, shelly/skeletal grainstone

• Mixed carbonate/clastic ramp setting
• Bioclastic, sparitic, silt and clay-free, 5 inches thick and capped by a 1-inch band of silty calcilutite. Fossils mostly unabraided

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, hydrochloric,

Primary reference: G. E. Young. 1973. An Ordovician (Arenigian) trilobite faunule of great diversity from the Ibex area, western Utah. Brigham Young University Geology Studies 20(4):91-115 [S. Finnegan/S. Finnegan/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 69261: authorized by Seth Finnegan, entered by Seth Finnegan on 22.02.2007, edited by Melanie Hopkins and Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Only trilobites and conodonts are reported at the genus or species level. "Brachiopods, gastropods, ostracods, graptolites, sponges, conodonts, and possible bivalve forms as evidenced by double-convex steinkerns" are also present.
Trilobita
 Phacopida - Pliomeridae
"Protopliomerops brevis" = Ibexaspis brevis, Pseudocybele altinasuta, Protopliomerops quattuor n. sp., ? Kanoshia depressus n. sp., "Pseudocybele lemurei" = Lemureops lemurei
"Protopliomerops brevis" = Ibexaspis brevis Young 1973 trilobite
Protopliomerops quattuor brevis
Pseudocybele altinasuta Hintze 1953 trilobite
Protopliomerops quattuor n. sp. Hintze 1953 trilobite
? Kanoshia depressus n. sp. Young 1973 trilobite
"Pseudocybele lemurei" = Lemureops lemurei Hintze 1953 trilobite
 Proetida - Hystricuridae
? Amblycranium "sp. 2" Ross 1951 trilobite
? Amblycranium linearus n. sp. Young 1973 trilobite
 Proetida - Bathyuridae
? Goniotelina plicolabeonus n. sp., "? Goniotelus unicorna n. sp." = Acidiphorus, Bathyurellus teretus n. sp., "Benthamaspis distinctus n. sp." = Benthamaspis gibberula
? Goniotelina plicolabeonus n. sp. Young 1973 trilobite
"? Goniotelus unicorna n. sp." = Acidiphorus trilobite
Bathyurellus teretus n. sp. Young 1973 trilobite
"Benthamaspis distinctus n. sp." = Benthamaspis gibberula Billings 1865 trilobite
 Proetida - Dimeropygidae
"Psalikilopsis alticapitis n. sp." = Heckethornia alticapitis, Dimeropygiella fillmorensis, "Ischyrotoma blanda" = Dimeropygiella blanda
"Psalikilopsis alticapitis n. sp." = Heckethornia alticapitis Young 1973 trilobite
Dimeropygiella fillmorensis Adrain et al. 2001 trilobite
"Ischyrotoma blanda" = Dimeropygiella blanda Hintze 1953 trilobite
 Proetida - Telephinidae
"Remopleuridiella angularis n. sp." = Opipeuter angularis, Carolinites killaryensis
"Remopleuridiella angularis n. sp." = Opipeuter angularis Young 1973 trilobite
Carolinites killaryensis Stubblefield 1950 trilobite
 Asaphida - Asaphidae
Presbynileus elongatus Hintze 1953 trilobite
"Ptyocephalus accliva" = Ptyocephalus acclivus Hintze 1953 trilobite
Trigonocerca typica Ross 1951 trilobite
 Ptychopariida - Shumardiidae
Shumardia exopthalmus Ross and Barnes 1967 trilobite
 Odontopleurida - Odontopleuridae
? Diacanthaspis trispineus n. sp. Young 1973 trilobite
Artiopoda
 Agnostida - Metagnostidae
Trinodus sp. M'Coy 1846
Conodonta
  -
Scandodus furnishi conodont
ID by R. L. Ethington
Scandodus sp. Lindstrom 1955 conodont
ID by R. L. Ethington
 Belodellida - Belodellidae
"aff. Distacodus stola" = Stolodus stola
"aff. Distacodus stola" = Stolodus stola Lindström 1955 conodont
ID by R. L. Ethington
 Protopanderodontida - Drepanoistodontidae
Paltodus jeffersonensis conodont
ID by R. L. Ethington
 Protopanderodontida - Acanthodontidae
? Ulrichodina spp. Furnish 1938 conodont
ID by R. L. Ethington
 Protopanderodontida - Protopanderodontidae
Scolopodus pseudoquadratus Branson and Mehl 1933 conodont
ID by R. L. Ethington
"? Scolopodus rex" = Scolopodus striatus Pander 1856 conodont
suspecies paltodiformis; ID by R. L. Ethington
Drepanodus homocurvatus conodont
ID by R. L. Ethington
Drepanodus sp. Pander 1856 conodont
ID by R. L. Ethington
? Drepanodus sp. Pander 1856 conodont
ID by R. L. Ethington
"Scolopodus quadraplicatus" = Colaptoconus quadraplicatus Branson and Mehl 1933 conodont
ID by R. L. Ethington
 Prioniodontida - Acodontidae
"Acontiodus coniformis" = Acodus, "Acontiodus sp." = Acodus, "Drepanodus arcuatus" = Acodus similaris
"Acontiodus coniformis" = Acodus conodont
ID by R. L. Ethington
"Acontiodus sp." = Acodus Pander 1856 conodont
ID by R. L. Ethington
"Drepanodus arcuatus" = Acodus similaris Rhodes 1955 conodont
ID by R. L. Ethington
 Prioniodontida -
Oepikodus quadratus conodont
ID by R. L. Ethington
 Prioniodontida - Oistodontidae
Oistodus linguatus conodont
ID by R. L. Ethington
Oistodus longiramis conodont
ID by R. L. Ethington
Oistodus parallelus conodont
ID by R. L. Ethington
Oistodus sp. Pander 1856 conodont
ID by R. L. Ethington
Oistodus aff. multicorrugatus conodont
ID by R. L. Ethington
Oistodus lanceolatus Pander 1856 conodont
ID by R. L. Ethington
 Prioniodontida - Phragmodontidae
Gothodus communis conodont
ID by R. L. Ethington
 Panderodontida - Panderodontidae
"Scolopodus gracilis" = Parapanderodus gracilis
"Scolopodus gracilis" = Parapanderodus gracilis Ethington and Clark 1964 conodont
ID by R. L. Ethington