Ibex region, House Fm., Ordovician (Tremadoc) zones b & c ( of the United States)

Where: Utah (38.9° N, 113.4° W: paleocoordinates 6.5° S, 85.2° W)

• coordinate based on nearby landmark

• basin-level geographic resolution

When: House Formation, Tremadoc (486.5 - 477.7 Ma)

• "Tremadoc, Zones B and C"

Environment/lithology: marine; cherty/siliceous limestone

• "thin-bedded ledge and slope forming ls. (siliceous calcilutite and calcisiltite) thin beds of calcarenite, some wavy bedding surfaces, no stromatolites"

Size class: macrofossils

Primary reference: L. F. Hintze, L. F. Braithwaite, D. L. Clark, R. L. Ethington, and R. F. Flower. 1972. A fossiliferous Lower Ordovician reference section from western United States. Polish Geological Institute; International Geological Congress, 23rd Session, Czechoslovakia, 1968 [M. Uhen/J. Ju/J. Ju]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 276: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Hintze et al. [1968 or 1972???, sic] Proc. IPU, XXIII Int'l Geol Cong., pp385-400"
Show authors, comments, and common names
Pterobranchia
 Dendroidea -
Dendroidea indet.
Dendroidea indet. Nicholson 1872 graptolite
Trilobita
 Proetida - Hystricuridae
Hystricurus sp.
Hystricurus sp. Raymond 1913 trilobite
 Asaphida - Asaphidae
Bellefontia sp.
Bellefontia sp. Walcott 1924 trilobite
 Asaphida - Nileidae
Symphysurina sp.
Symphysurina sp. Ulrich 1924 trilobite
 Ptychopariida - Kingstoniidae
Clelandia sp.
Clelandia sp. Cossman 1902 trilobite
Rhynchonellata
 Orthida - Plectorthidae
Nanorthis sp.
Nanorthis sp. Ulrich and Cooper 1936
 Orthida - Eoorthidae
Apheoorthis sp.
Apheoorthis sp. Ulrich and Cooper 1936
 Pentamerida - Clarkellidae
Syntrophina sp.
Lingulata
 Acrotretida - Acrotretidae
Eurytreta sp.
Eurytreta sp. Rowell 1966
Gastropoda
 Euomphalina - Ophiletidae
Ophileta sp.
Ophileta sp. Vanuxem 1842 snail