Roberts Mountain (Silurian), Roberts Mountain Fm. (Silurian of the United States)

Where: Nevada (39.8° N, 116.3° W: paleocoordinates 7.1° S, 71.1° W)

• coordinate based on political unit

When: Roberts Mountain Formation, Llandovery (443.4 - 433.4 Ma)

• "upper Llandovery"

Environment/lithology: marine; black limestone and shale

• "ls overlying black graptolitic shale"

Size class: macrofossils

Primary reference: J. G. Johnson, A. J. Boucot, and M. A. Murphy. 1967. Lower Devonian faunal succession in central Nevada. Alberta Society of Petroleum Geologists 2:679 -691 [M. Uhen/J. Ju/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 467: authorized by Jack Sepkoski, entered by Mike Sommers on 25.03.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• "J.G. Johnson, A.J. Boucot, M.A. Murphy. 1967. Lower Devonian faunal succession in central NV. Internat. Symp. on the Devonian System, Calgary Alberta, 1967 Alberta Soc. Petrol. Geol. 2:679-691"
Show authors, comments, and common names
Rhynchonellata
 Pentamerida - Subrianidae
Conchidium sp., Cymbidium sp.
Conchidium sp. Oehlert 1887
Cymbidium sp. Kirk 1926
 Pentamerida - Pentameridae
Pentamerifera sp.
Pentamerifera sp. Khodalevich 1939
 Pentamerida - Clorindidae
Antirhynchonella sp.
Antirhynchonella sp. Oehlert 1887
 Pentamerida - Gypidulidae
Gypidula sp.
Gypidula sp. Hall 1867
 Rhynchonellida - Machaerariidae
Ferganella sp.
Ferganella sp. Nikiforova 1937
 Spiriferida -
Spiriferida indet.
Spiriferida indet. Waagen 1883
reticulariid
 Spiriferida - Delthyrididae
Delthyris sp.
Delthyris sp. Dalman 1828
 Spiriferida - Reticulariidae
Alaskospira sp.
Alaskospira sp. Kirk and Amsden 1952
 Spiriferida - Cyrtiidae
Hedeina sp.
Hedeina sp. Boucot 1957
 Atrypida - Atrypidae
Atrypa sp.
Atrypa sp. Dalman 1828
 Atrypida - Atrypinidae
Gracianella sp.
Gracianella sp. Johnson and Boucot 1967
2 species
 Atrypida - Septatrypidae
"Dubaria sp." = Septatrypa, "Atrypella sp." = Atrypoidea
"Dubaria sp." = Septatrypa Kozlowski 1929
"Atrypella sp." = Atrypoidea Mitchell and Dun 1920
 Athyridida - Nucleospiridae
Nucleospira sp.
Nucleospira sp. Hall 1859
 Athyridida - Meristellidae
Meristina sp.
Meristina sp. Hall 1867
 Orthida - Hesperorthidae
Ptychopleurella sp., Dolerorthis sp.
Ptychopleurella sp. Schuchert and Cooper 1931
Dolerorthis sp. Schuchert and Cooper 1931
 Orthida - Dicoelosiidae
Dicoelosia sp.
Dicoelosia sp. King 1850
 Orthida - Dalmanellidae
Isorthis sp.
Isorthis sp. Kozlowski 1929
 Orthida - Draboviidae
Salopina sp.
Salopina sp. Boucot 1960
 Protorthida - Skenidiidae
Skenidioides sp.
Skenidioides sp. Schuchert and Cooper 1931
Strophomenata
 Strophomenida -
Strophomenida indet.
Strophomenida indet. Opik 1934
2+ indet. orthotetacean genera
 Strophomenida - Rafinesquinidae
Leptaena sp.
Leptaena sp. Dalman 1828
 Orthotetida - Chilidiopsidae
Morinorhynchus sp.
Morinorhynchus sp. Havlicek 1965
Trilobita
 Phacopida - Encrinuridae
Encrinurus sp.
Encrinurus sp. Emmrich 1844 trilobite
Ostracoda
 Palaeocopida -
Severella sp.
Severella sp. ostracod
Anthozoa
 Heliolitida - Halysitidae
Halysites sp.
Halysites sp. von Waldheim 1813 tabulate coral