Brock Mountain, 3 miles east of Madison's ranch (Trachyceras subzone) (Triassic of the United States)

Where: Shasta County, California (40.9° N, 122.1° W: paleocoordinates 13.5° N, 53.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Hosselkus Formation, Tuvalian (232.0 - 221.5 Ma)

• Zone of Tropites subbullatus; Trachyceras subzone according to Smith, 1927

• group of beds-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Reposited in the USNM

Primary reference: A. Hyatt and J. P. Smith. 1905. The Triassic cephalopod genera of America. United States Geological Survey Professional Paper 40:1-394 [D. Bottjer/C. Powers/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 33324: authorized by David Bottjer, entered by Catherine Powers on 25.07.2003, edited by Matthew Clapham and Bethany Allen

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Rhynchonellida - Rhynchonellidae
"Rhynchonella cf. solitaria" = Capillirhynchia solitaria1
"Rhynchonella cf. solitaria" = Capillirhynchia solitaria1 Oppel 1860
 Terebratulida - Terebratulidae
Terebratula sp.1 Müller 1776
Bivalvia
 Mytilida - Mytilidae
"Modiola sp." = Modiolus1
"Modiola sp." = Modiolus1 Lamarck 1801 mussel
 Ostreida - Bakevelliidae
Gervillia sp.1 Defrance 1820 oyster
 Ostreida - Posidoniidae
Posidonia jacksoni n. sp.2 Smith 1927 oyster
good
 Ostreida - Halobiidae
Halobia superba1 Mojsisovics 1874 oyster
 Pectinida - Pectinoidae
Pectinidae indet.1 Wilkes 1810 scallop
as "Pecten sp."
Gastropoda
 Sorbeoconcha - Capulidae
"Capulus" silverthorni n. sp.2 Smith 1927 snail
good
 Trochoidea - Colloniidae
Collonia occidentalis n. sp.2 Smith 1927 snail
Cephalopoda
 Phylloceratida - Ussuritidae
"Tirolites (Metatirolites) foliaceus" = Metatirolites foliaceus
"Tirolites (Metatirolites) foliaceus" = Metatirolites foliaceus Dittmar 1866 ammonite
good
 Ceratitida - Sandlingitidae
Sandlingites oribasus2 Dittmar 1866 ceratite
good
Sandlingites andersoni n. sp. Hyatt and Smith 1905 ceratite
good
Clionites (Traskites) stantoni n. sp.2 Smith 1927 ceratite
good
Clionites (Stantonites) rugosus n. sp. Hyatt and Smith 1905 ceratite
good
Clionites (Stantonites) evolutus n. sp.2 Smith 1927 ceratite
good
Clionites (Neanites) californicus n. sp. Hyatt and Smith 1905 ceratite
good
Clionites (Neanites) minutus n. sp.2 Smith 1927 ceratite
good
Clionites (Neanites) osmonti n. sp.2 Smith 1927 ceratite
good
Clionites (Traskites) nanus n. sp.2 Smith 1927 ceratite
good
Clionites (Traskites) robustus n. sp. Hyatt and Smith 1905 ceratite
good
Clionites (Traskites) americanus n. sp.2 Smith 1927 ceratite
good
Clionites (Traskites) tornquisti n. sp.2 Smith 1927 ceratite
good
Clionites (Traskites) fairbanksi n. sp. Hyatt and Smith 1905 ceratite
good
Clionites (Shastites) compressus n. sp. Hyatt and Smith 1905 ceratite
good
Clionites (Shastites) whitneyi n. sp.2 Smith 1927 ceratite
good
Clionites (Shastites) compactus n. sp.2 Smith 1927 ceratite
good
 Ceratitida - Tibetitidae
Hauerites lawsoni n. sp.2 Smith 1927 ceratite
good
 Ceratitida - Clionitidae
Leconteiceras occidentale n. sp.2, Leconteia californica n. gen. n. sp., "Californites merriami n. gen. n. sp." = Clionites (Californites) merriami, Clionites (Californites) careyi n. sp.2, "Polycyclus nodifer n. sp." = Sympolycyclus nodifer
Leconteiceras occidentale n. sp.2 Smith 1927 ceratite
good
Leconteia californica n. gen. n. sp. Hyatt and Smith 1905 ceratite
good
"Californites merriami n. gen. n. sp." = Clionites (Californites) merriami Hyatt and Smith 1905 ceratite
Clionites (Californites) careyi n. sp.2 Smith 1927 ceratite
good
"Polycyclus nodifer n. sp." = Sympolycyclus nodifer Hyatt and Smith 1905 ceratite
good
 Ceratitida - Arcestidae
Arcestes (Proarcestes) traski n. sp.2 Smith 1927 ceratite
good
 Ceratitida - Haloritidae
Sagenites (Trachysagenites) shastensis n. sp.2 Smith 1927 ceratite
good
Sagenites (Trachysagenites) herbichi Mojsisovics 1893 ceratite
good
 Ceratitida - Tropiceltitidae
Tornquistites evolutus n. gen. n. sp.
Tornquistites evolutus n. gen. n. sp. Hyatt and Smith 1905 ceratite
good
 Ceratitida - Tropitidae
Paratropites (Paulotropites) colei2, Paratropites (Paulotropites) shastensis2, Discotropites sandlingensis, Discotropites lineatus2, Discotropites formosus n. sp.2, "Tropites dilleri" = Tropites dilleri2, "Tropites dilleri" = Tropites dilleri3, "Tropites armatus n. sp." = Tropites dilleri2, "Tropites occidentalis" = Tropites dilleri2, Tropites fusobullatus2, Paratropites (Gymnotropites) rotundus n. sp.2, Paratropites (Gymnotropites) laevis n. sp.2, "Paratropites (Gymnotropites) americanus n. sp." = Gymnotropites americanus, "Jovites (Bacchites) sphaericus" = Indonesites sphaericus2, "Indonesites sphaericus" = Indonesites sphaericus3, "Paratropites gabbi n. sp." = Pleurotropites gabbi2, "Paratropites antiselli n. sp." = Pleurotropites gabbi2, "Paratropites arnoldi n. sp." = Pleurotropites gabbi2, "Paratropites (Gymnotropites) yatesi n. sp." = Pleurotropites gabbi2, "Paratropites gracilis n. sp." = Pleurotropites gracilis2
Paratropites (Paulotropites) colei2 Smith 1927 ceratite
good
Paratropites (Paulotropites) shastensis2 Smith 1927 ceratite
good
Discotropites sandlingensis Hauer 1849 ceratite
good
Discotropites lineatus2 Smith 1927 ceratite
good
Discotropites formosus n. sp.2 Smith 1927 ceratite
good
"Tropites dilleri" = Tropites dilleri2 Smith 1904 ceratite
good
"Tropites dilleri" = Tropites dilleri3 Smith 1904 ceratite
good
"Tropites armatus n. sp." = Tropites dilleri2 Smith 1904 ceratite
good
"Tropites occidentalis" = Tropites dilleri2 Smith 1904 ceratite
good
Tropites fusobullatus2 Mojsisovics 1893 ceratite
good
Paratropites (Gymnotropites) rotundus n. sp.2 Smith 1927 ceratite
good
Paratropites (Gymnotropites) laevis n. sp.2 Smith 1927 ceratite
good
"Paratropites (Gymnotropites) americanus n. sp." = Gymnotropites americanus Hyatt and Smith 1905 ceratite
good
"Jovites (Bacchites) sphaericus" = Indonesites sphaericus2 Smith 1927 ceratite
good
"Indonesites sphaericus" = Indonesites sphaericus3 Smith 1927 ceratite
good
"Paratropites gabbi n. sp." = Pleurotropites gabbi2 Smith 1927 ceratite
good
"Paratropites antiselli n. sp." = Pleurotropites gabbi2 Smith 1927 ceratite
good
"Paratropites arnoldi n. sp." = Pleurotropites gabbi2 Smith 1927 ceratite
good
"Paratropites (Gymnotropites) yatesi n. sp." = Pleurotropites gabbi2 Smith 1927 ceratite
good
"Paratropites gracilis n. sp." = Pleurotropites gracilis2 Smith 1927 ceratite
good
 Ceratitida - Episculitidae
"Tornquistites obolinus" = Parisculites obolinus2
"Tornquistites obolinus" = Parisculites obolinus2 Dittmar 1886 ceratite
good
 Ceratitida -
Paraganides californicus n. gen. n. sp. Hyatt and Smith 1905 ceratite
good
Paraganides (Gymnotropites) californicus n. sp.2 Hyatt and Smith 1905 ceratite
good
 Ceratitida - Trachyceratidae
Polycyclus henseli2, "Trachyceras (Protrachyceras) shastense" = Spirogmoceras shastense2, "Trachyceras (Protrachyceras) californicum n. sp." = Spirogmoceras shastense2, "Trachyceras (Protrachyceras) beckeri n. sp." = Spirogmoceras shastense2, "Trachyceras (Protrachyceras) madisonense n. sp." = Spirogmoceras shastense2, "Trachyceras (Protrachyceras) lindgreni n. sp." = Spirogmoceras shastense2, "Trachyceras (Protrachyceras) lecontei n. sp." = Spirogmoceras shastense, Sirenites lawsoni n. sp., Arpadites kingi n. sp.2, "Arpadites gabbi n. sp." = Trachystenoceras gabbi
Polycyclus henseli2 Oppel 1862 ceratite
good
"Trachyceras (Protrachyceras) shastense" = Spirogmoceras shastense2 Smith 1904 ceratite
good
"Trachyceras (Protrachyceras) californicum n. sp." = Spirogmoceras shastense2 Smith 1904 ceratite
good
"Trachyceras (Protrachyceras) beckeri n. sp." = Spirogmoceras shastense2 Smith 1904 ceratite
good
"Trachyceras (Protrachyceras) madisonense n. sp." = Spirogmoceras shastense2 Smith 1904 ceratite
good
"Trachyceras (Protrachyceras) lindgreni n. sp." = Spirogmoceras shastense2 Smith 1904 ceratite
good
"Trachyceras (Protrachyceras) lecontei n. sp." = Spirogmoceras shastense Smith 1904 ceratite
good
Sirenites lawsoni n. sp. Hyatt and Smith 1905 ceratite
good
Arpadites kingi n. sp.2 Smith 1927 ceratite
good
"Arpadites gabbi n. sp." = Trachystenoceras gabbi Hyatt and Smith 1905 ceratite
good
 Ceratitida - Klamathitidae
Dieneria arthaberi n. gen. n. sp., "Hauerites ashleyi n. sp." = Parahauerites ashleyi
Dieneria arthaberi n. gen. n. sp. Hyatt and Smith 1905 ceratite
good
"Hauerites ashleyi n. sp." = Parahauerites ashleyi Hyatt and Smith 1905 ceratite
good
 Nautilida - Tainoceratidae
Mojsvaroceras turneri n. sp. Hyatt and Smith 1905 nautiloid
good
 Nautilida - Clydonautilidae
"Clydonautilus hessi n. sp." = Proclydonautilus hessi2 Smith 1927 nautiloid
Proclydonautilus stantoni n. sp.2 Smith 1927 nautiloid
Proclydonautilus triadicus von Mojsisovics 1873 nautiloid
good
 Orthocerida - Orthoceratidae
Orthoceras shastense n. sp. Hyatt and Smith 1905
good
Crinoidea
 Isocrinida - Isocrinidae
Isocrinus californicus2 Clark and Twitchell 1915 Sea lily