H-20: Blackhillsian, Utah

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Conodonta - Prioniodontida
Oepikodus quadratus
19 individuals
ID by R. L. Ethington
Conodonta - Prioniodontida - Phragmodontidae
Gothodus communis
15 individuals
ID by R. L. Ethington
Conodonta - Prioniodontida - Oistodontidae
Oistodus linguatus
15 individuals
ID by R. L. Ethington
Oistodus longiramis
1 individual
ID by R. L. Ethington
Oistodus parallelus
1 individual
ID by R. L. Ethington
Oistodus sp. Pander 1856
12 individuals
ID by R. L. Ethington
Oistodus aff. multicorrugatus
4 individuals
ID by R. L. Ethington
Oistodus lanceolatus Pander 1856
1 individual
ID by R. L. Ethington
Conodonta - Prioniodontida - Acodontidae
Drepanodus arcuatus Pander 1856
6 individuals
synonym of Acodus similaris
ID by R. L. Ethington
Acontiodus coniformis
9 individuals
synonym of Acodus
ID by R. L. Ethington
Acontiodus sp. Pander 1856
4 individuals
synonym of Acodus
ID by R. L. Ethington
Conodonta - Belodellida - Belodellidae
aff. Distacodus stola Lindström 1955
1 individual
recombined as Stolodus stola
ID by R. L. Ethington
Conodonta - Panderodontida - Panderodontidae
Scolopodus gracilis Ethington and Clark 1964
7 individuals
recombined as Parapanderodus gracilis
ID by R. L. Ethington
Conodonta
Scandodus furnishi
21 individuals
ID by R. L. Ethington
Scandodus sp. Lindstrom 1955
24 individuals
ID by R. L. Ethington
Conodonta - Protopanderodontida - Drepanoistodontidae
Paltodus jeffersonensis
3 individuals
ID by R. L. Ethington
Conodonta - Protopanderodontida - Protopanderodontidae
Drepanodus homocurvatus
6 individuals
ID by R. L. Ethington
Drepanodus sp. Pander 1856
3 individuals
ID by R. L. Ethington
? Drepanodus sp. Pander 1856
3 individuals
ID by R. L. Ethington
? Scolopodus rex Lindström 1955
167 individuals
synonym of Scolopodus striatus
suspecies paltodiformis; ID by R. L. Ethington
Scolopodus pseudoquadratus Branson and Mehl 1933
2 individuals
ID by R. L. Ethington
Scolopodus quadraplicatus Branson and Mehl 1933
7 individuals
recombined as Colaptoconus quadraplicatus
ID by R. L. Ethington
Conodonta - Protopanderodontida - Acanthodontidae
? Ulrichodina spp.
2 individuals
ID by R. L. Ethington
Agnostida - Metagnostidae
Trinodus sp. M'Coy 1846
1 individual
Trilobita - Proetida - Dimeropygidae
Ischyrotoma blanda (Hintze 1953)
214 individuals
original and current combination Dimeropygiella blanda
Ischyrotoma ovata (Hintze 1953)
367 individuals
    = Dimeropygiella fillmorensis Adrain et al. 2001
Adrain et al. 2001
Reidentification based on figured cranidia in Young 1973; figured pygidia identified as I. ovata = I. blanda
Psalikilopsis alticapitis n. sp. Young 1973
77 individuals
recombined as Heckethornia alticapitis
Trilobita - Proetida - Telephinidae
Carolinites killaryensis (Stubblefield 1950)
6 individuals
Remopleuridiella angularis n. sp. Young 1973
2 individuals
recombined as Opipeuter angularis
Trilobita - Proetida - Hystricuridae
? Amblycranium informal sp. 2 Ross 1951
3 individuals
? Amblycranium linearus n. sp. Young 1973
11 individuals
Trilobita - Proetida - Bathyuridae
Benthamaspis distinctus n. sp. Young 1973
23 individuals
synonym of Bathyurus gibberulus
Bathyurellus teretus n. sp. Young 1973
7 individuals
? Goniotelus unicorna n. sp.
2 individuals
synonym of Acidiphorus
? Goniotelina plicolabeonus n. sp. Young 1973
60 individuals
Trilobita - Phacopida - Pliomeridae
Pseudocybele altinasuta Hintze 1953
23 individuals
Pseudocybele lemurei Hintze 1953
136 individuals
recombined as Lemureops lemurei
Protopliomerops quattuor n. sp. Hintze 1953
43 individuals
? Kanoshia depressus n. sp. Young 1973
35 individuals
Protopliomerops brevis (Young 1973)
recombined as Ibexaspis brevis
Protopliomerops quattuor brevis
Trilobita - Asaphida - Asaphidae
Trigonocerca typica Ross 1951
108 individuals
Ptyocephalus accliva (Hintze 1953)
43 individuals
recombined as Ptyocephalus acclivus
Presbynileus elongatus (Hintze 1953)
62 individuals
Trilobita - Ptychopariida - Shumardiidae
Shumardia exopthalmus Ross and Barnes 1967
395 individuals
Trilobita - Odontopleurida - Odontopleuridae
? Diacanthaspis trispineus n. sp. Young 1973
14 individuals
see common names

Geography
Country:United States State/province:Utah County:Millard
Coordinates: 39.8° North, 113.5° West (view map)
Paleocoordinates:7.2° South, 82.0° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Ordovician Epoch:Early/Lower Ordovician
Stage:Floian 10 m.y. bin:Ordovician 2
Key time interval:Blackhillsian Trilobite zone: Trigonocerca typica
Age range of interval:473.90000 - 470.00000 m.y. ago
Stratigraphy
Geological group:Pogonip Formation:Fillmore Member:5
Local section:H Local bed:H-20
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: Zone H.
Lithology and environment
Primary lithology:shelly/skeletal lithified grainstone
Includes fossils?Y
Lithology description: Bioclastic, sparitic, silt and clay-free, 5 inches thick and capped by a 1-inch band of silty calcilutite. Fossils mostly unabraided
Environment:open shallow subtidal Tectonic setting:passive margin
Geology comments: Mixed carbonate/clastic ramp setting
Taphonomy
Modes of preservation:body,replaced with silica
Size of fossils:macrofossils
Preservation of anatomical detail:excellent
Abundance in sediment:abundant
Articulated whole bodies:some
Disassociated major elements:many
Temporal resolution:time-averaged
Spatial resolution:parautochthonous
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:bulk,hydrochloric,field collection
Reason for describing collection:taxonomic analysis
Taxonomic list comments: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.
Metadata
Database number:69261
Authorizer:S. Finnegan, P. Wagner, M. Hopkins Enterer:S. Finnegan, M. Hopkins, P. Wagner
Modifier:P. Wagner Research group:marine invertebrate
Collections that are a subset of this one:105780
Created:2007-02-22 18:05:48 Last modified:2018-04-18 15:07:28
Access level:the public Released:2007-02-22 18:05:48
Creative Commons license:CC BY
Reference information

Primary reference:
19961. 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]

Secondary references:

35065 J. M. Adrain, S. R. Westrop, E. Landing and R. A. Fortey. 2001. Systematics of the Ordovician trilobites Ischyrotoma and Dimeropygiella, with species from the Type Ibexian area, western U.S.A. Journal of Paleontology 75(5):947-971 [M. Hopkins/M. Hopkins]