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.
Show authors, comments, and common names
Conodonta
 Protopanderodontida - Acanthodontidae
? Ulrichodina spp.
? Ulrichodina spp. Furnish 1938 conodont
ID by R. L. Ethington
 Protopanderodontida - Drepanoistodontidae
Paltodus jeffersonensis
Paltodus jeffersonensis conodont
ID by R. L. Ethington
 Protopanderodontida - Protopanderodontidae
Drepanodus homocurvatus, Drepanodus sp., ? Drepanodus sp., "? Scolopodus rex" = Scolopodus striatus, Scolopodus pseudoquadratus, "Scolopodus quadraplicatus" = Colaptoconus quadraplicatus
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 rex" = Scolopodus striatus Pander 1856 conodont
suspecies paltodiformis; ID by R. L. Ethington
Scolopodus pseudoquadratus Branson and Mehl 1933 conodont
ID by R. L. Ethington
"Scolopodus quadraplicatus" = Colaptoconus quadraplicatus Branson and Mehl 1933 conodont
ID by R. L. Ethington
  -
Scandodus furnishi, Scandodus sp.
Scandodus furnishi conodont
ID by R. L. Ethington
Scandodus sp. Lindstrom 1955 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 - Oistodontidae
Oistodus linguatus, Oistodus longiramis, Oistodus parallelus, Oistodus sp., Oistodus aff. multicorrugatus, Oistodus lanceolatus
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 -
Oepikodus quadratus
Oepikodus quadratus conodont
ID by R. L. Ethington
 Prioniodontida - Phragmodontidae
Gothodus communis
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
 Belodellida - Belodellidae
"aff. Distacodus stola" = Stolodus stola
"aff. Distacodus stola" = Stolodus stola Lindström 1955 conodont
ID by R. L. Ethington
Trilobita
 Proetida - Bathyuridae
"Benthamaspis distinctus n. sp." = Benthamaspis gibberula, Bathyurellus teretus n. sp., ? Goniotelina plicolabeonus n. sp., "? Goniotelus unicorna n. sp." = Acidiphorus
"Benthamaspis distinctus n. sp." = Benthamaspis gibberula Billings 1865 trilobite
Bathyurellus teretus n. sp. Young 1973 trilobite
? Goniotelina plicolabeonus n. sp. Young 1973 trilobite
"? Goniotelus unicorna n. sp." = Acidiphorus trilobite
 Proetida - Telephinidae
Carolinites killaryensis, "Remopleuridiella angularis n. sp." = Opipeuter angularis
Carolinites killaryensis Stubblefield 1950 trilobite
"Remopleuridiella angularis n. sp." = Opipeuter angularis Young 1973 trilobite
 Proetida - Hystricuridae
? Amblycranium "sp. 2", ? Amblycranium linearus n. sp.
? Amblycranium "sp. 2" Ross 1951 trilobite
? Amblycranium linearus n. sp. Young 1973 trilobite
 Proetida - Dimeropygidae
"Psalikilopsis alticapitis n. sp." = Heckethornia alticapitis, "Ischyrotoma blanda" = Dimeropygiella blanda, Dimeropygiella fillmorensis
"Psalikilopsis alticapitis n. sp." = Heckethornia alticapitis Young 1973 trilobite
"Ischyrotoma blanda" = Dimeropygiella blanda Hintze 1953 trilobite
Dimeropygiella fillmorensis Adrain et al. 2001 trilobite
 Odontopleurida - Odontopleuridae
? Diacanthaspis trispineus n. sp.
? Diacanthaspis trispineus n. sp. Young 1973 trilobite
 Asaphida - Asaphidae
Trigonocerca typica, Presbynileus elongatus, "Ptyocephalus accliva" = Ptyocephalus acclivus
Trigonocerca typica Ross 1951 trilobite
Presbynileus elongatus Hintze 1953 trilobite
"Ptyocephalus accliva" = Ptyocephalus acclivus Hintze 1953 trilobite
 Ptychopariida - Shumardiidae
Shumardia exopthalmus
Shumardia exopthalmus Ross and Barnes 1967 trilobite
 Phacopida - Pliomeridae
? Kanoshia depressus n. sp., "Pseudocybele lemurei" = Lemureops lemurei, Protopliomerops quattuor n. sp., Pseudocybele altinasuta, "Protopliomerops brevis" = Ibexaspis brevis
? Kanoshia depressus n. sp. Young 1973 trilobite
"Pseudocybele lemurei" = Lemureops lemurei Hintze 1953 trilobite
Protopliomerops quattuor n. sp. Hintze 1953 trilobite
Pseudocybele altinasuta Hintze 1953 trilobite
"Protopliomerops brevis" = Ibexaspis brevis Young 1973 trilobite
Protopliomerops quattuor brevis
Artiopoda
 Agnostida - Metagnostidae
Trinodus sp.
Trinodus sp. M'Coy 1846