ORDOVICIAN
Trilobites (all):
Amblycranium cornutum Ross, 1951
Amblycranium? populus Ross, 1951
Amblycranium variabile Ross, 1951
Amechilus palaora Ross, 1951
Asaphelina? sp. Ross, 1951
Asaphellus? eudocia (Walcott, 1925)
Asaphellus? sp. A Ross, 1951
Asaphellus? sp. B Ross, 1951
Basilicus? sp. Ross, 1951
Bellefontia acuminiferentis Ross, 1951
Bellefontia chamberlaini Clark, 1935
Carolinites genacinaca Ross, 1951
Clelandia utahensis Ross, 1951
Dimeropygiella caudanodosa Ross, 1951
Eleutherocentrus williamsi Ross, 1951
Goniophrys prima Ross, 1951
Goniotelus sp. (mentioned in Ross, 1951)
Hillyardina semicylindrica Ross, 1951
Hyperbolochilus marginauctum Ross, 1951
Hypothetica rawi Ross, 1951
Hystricurus acumennasus Ross, 1951
Hystricurus contractus Ross, 1951
Hystricurus flectimembrus Ross, 1951
Hystricurus genalatus Ross, 1951
Hystricurus oculilunatus Ross, 1951
Hystricurus paragenalatus Ross, 1951
Hystricurus politus Ross, 1951
Hystricurus robustus Ross, 1951
Hystricurus sp. A Ross, 1951
Hystricurus sp. B Ross, 1951
Hystricurus? sp. C Ross, 1951
Hystricurus sp. D Ross, 1951
Hystricurus? sp. E Ross, 1951
Hystricurus? sp. F Ross, 1951
Hystricurus? sp. G Ross, 1951
Hystricurus? sp. H Ross, 1951
Isoteloides? sp. Ross, 1951
Jeffersonia peltabella Ross, 1951
Kawina sexapugia Ross, 1951
Kirkella declevita Ross, 1951
Kirkella sp. Ross, 1951
Lachnostoma latucelsum Ross, 1951
Leiostegium manitouense Walcott
Licnocephala bicornata Ross, 1951
Licnocephala? sp. Ross, 1951
Macropyge gladiator Ross, 1951
Menoparia genalunata Ross, 1951
Niobe? sp. Ross, 1951
Pachycranium faciclunis Ross, 1951
Pachycranium sp. Ross, 1951
Paenebeltella vultulata Ross, 1951
Parahystricurus carinatus Ross, 1951
Parahystricurus fraudator Ross, 1951
Parahystricurus oculirotundus Ross, 1951
Parahystricurus pustulosus Ross, 1951
Parahystricurus? sp. A Ross, 1951
Parahystricurus? sp. B Ross, 1951
Parahystricurus? sp. C Ross, 1951
Pilekia? sp. Ross, 1951
Platycolpus? sp. Ross, 1951
Protopliomerops celsaora Ross, 1951
Protopliomerops contracta Ross, 1951
Protopliomerops superciliosa Ross, 1951
Psalikilus typicum Ross, 1951
Psalikilus? sp. Ross, 1951
Pseudoclelandia cornupsittaca Ross, 1951
Pseudoclelandia fluxafissura Ross, 1951
Pseudoclelandia lenisora Ross, 1951
Pseudocybele nasuta Ross, 1951
Pseudohystricurus obesus Ross, 1951
Pseudohystricurus rotundus Ross, 1951
Pseudohystricurus sp. Ross, 1951
Pyraustocranium orbatum Ross, 1951
Remopleuridiella caudalimbata Ross, 1951
Scinocephalus solitecti Ross, 1951
Symphysurina sp. A Ross, 1951
Symphysurina sp. B Ross, 1951
Tesselacauda depressa Ross, 1951
Trigonocerca typica Ross, 1951
Xenostegium franklinense Ross, 1951
"Xenostegium" taurus Walcott
undetermined genus and species A Ross, 1951
undetermined genus and species B Ross, 1951
undetermined genus and species C Ross, 1951
undetermined genus and species D Ross, 1951
undetermined genus and species E Ross, 1951
Trilobites (in each Zone):
Garden City Formation (Zone L):
-no trilobites reported
Garden City Formation (Zone K):
-no trilobites reported
Garden City Formation (Zone J):
Carolinites genacinaca Ross, 1951
Dimeropygiella caudanodosa Ross, 1951
Eleutherocentrus williamsi Ross, 1951
Isoteloides? sp. Ross, 1951
Kawina sexapugia Ross, 1951
Kirkella declevita Ross, 1951
Lachnostoma latucelsum Ross, 1951
Psalikilus? sp. Ross, 1951
Pseudocybele nasuta Ross, 1951
Garden City Formation (Zone I):
Goniotelus sp. (mentioned in Ross, 1951)
Garden City Formation (Zone H):
Trigonocerca typica Ross, 1951
Garden City Formation (Zone G):
Asaphellus? eudocia (Walcott, 1925)
Asaphellus? sp. A Ross, 1951
Asaphellus? sp. B Ross, 1951
Basilicus? sp. Ross, 1951
Jeffersonia peltabella Ross, 1951
Licnocephala bicornata Ross, 1951
Licnocephala? sp. Ross, 1951
Macropyge gladiator Ross, 1951
Niobe? sp. Ross, 1951
Platycolpus? sp. Ross, 1951
Protopliomerops celsaora Ross, 1951
Protopliomerops contracta Ross, 1951
Scinocephalus solitecti Ross, 1951
"Xenostegium" taurus Walcott
Garden City Formation (Zone F):
Amblycranium cornutum Ross, 1951
Goniophrys prima Ross, 1951
Hillyardina semicylindrica Ross, 1951
Hyperbolochilus marginauctum Ross, 1951
Hypothetica rawi Ross, 1951
Hystricurus acumennasus Ross, 1951
Hystricurus contractus Ross, 1951
Hystricurus flectimembrus Ross, 1951
Hystricurus oculilunatus Ross, 1951
Pachycranium faciclunis Ross, 1951
Parahystricurus fraudator Ross, 1951
Parahystricurus oculirotundus Ross, 1951
Parahystricurus pustulosus Ross, 1951
Parahystricurus? sp. C Ross, 1951
Protopliomerops superciliosa Ross, 1951
Pseudoclelandia cornupsittaca Ross, 1951
Pseudoclelandia fluxafissura Ross, 1951
Pseudohystricurus obesus Ross, 1951
Pyraustocranium orbatum Ross, 1951
undetermined genus and species A Ross, 1951
undetermined genus and species B Ross, 1951
undetermined genus and species E Ross, 1951
Garden City Formation (Zone E):
Amblycranium? populus Ross, 1951
Amblycranium variabile Ross, 1951
Amblycranium? sp. (of Ross, 1951)
Amechilus palaora Ross, 1951
Hystricurus robustus Ross, 1951
Hystricurus sp. B Ross, 1951
Hystricurus? sp. C Ross, 1951
Paenebeltella vultulata Ross, 1951
Parahystricurus carinatus Ross, 1951
Pilekia? sp. Ross, 1951
Pseudoclelandia lenisora Ross, 1951
Pseudohystricurus sp. Ross, 1951
Tesselacauda depressa Ross, 1951
Garden City Formation (Zone D):
Leiostegium manitouense Walcott
Garden City Formation (Zone C):
Hystricurus? sp. I (of Ross, 1951)
Symphysurina sp. B Ross, 1951
Garden City Formation (Zone B):
Bellefontia? acuminiferentis Ross, 1951
Bellefontia chamberlaini Clark, 1935
Clelandia utahensis Ross, 1951
Hystricurus genalatus Ross, 1951
Hystricurus paragenalatus Ross, 1951
Hystricurus politus Ross, 1951
Hystricurus? sp. F Ross, 1951
Hystricurus? sp. G Ross, 1951
Hystricurus? sp. H Ross, 1951
Parahystricurus? sp. A Ross, 1951
Parahystricurus? sp. B Ross, 1951
Remopleuridiella caudalimbata Ross, 1951
Xenostegium franklinense Ross, 1951
undetermined genus and species D Ross, 1951
Garden City Formation (Zone A):
Bellefontia? sp. (of Ross, 1951)
Hystricurus sp. D Ross, 1951
Pseudohystricurus rotundus Ross, 1951
Symphysurina sp. A Ross, 1951
Symphysurina cf. S. woosteri Walcott
COMMENTS:
Ross describes 87 species, and perhaps 48 genera, from the Garden City Formation. Many of the generic assignments and species designations have changed since Ross's report in 1951. We look forward to anybody wishing to provide an updated list of this diverse trilobite fauna.
REFERENCES:
Ross, R. J. Jr. (1951) Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Peabody Museum of Natural History, Yale University, Bulletin 6, 161 pp., 36 pls.
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