Roberts Mountain (Silurian), Roberts Mountain Fm.: Llandovery, Nevada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Strophomenata - Strophomenida
2+ indet. orthotetacean genera
Strophomenata - Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Strophomenata - Orthotetida - Chilidiopsidae
Morinorhynchus sp. Havlicek 1965
Rhynchonellata - Rhynchonellida - Machaerariidae
Ferganella sp. Nikiforova 1937
Rhynchonellata - Pentamerida - Pentameridae
Pentamerifera sp. Khodalevich 1939
Rhynchonellata - Pentamerida - Subrianidae
Conchidium sp. Oehlert 1887
Cymbidium sp. Kirk 1926
Rhynchonellata - Pentamerida - Gypidulidae
Rhynchonellata - Pentamerida - Clorindidae
Antirhynchonella sp. Oehlert 1887
Rhynchonellata - Atrypida - Septatrypidae
Rhynchonellata - Atrypida - Atrypidae
Atrypa sp. Dalman 1828
Rhynchonellata - Atrypida - Atrypinidae
Gracianella sp. Johnson and Boucot 1967
2 species
Rhynchonellata - Spiriferida
reticulariid
Rhynchonellata - Spiriferida - Delthyrididae
Delthyris sp. Dalman 1828
Rhynchonellata - Spiriferida - Reticulariidae
Rhynchonellata - Spiriferida - Cyrtiidae
Rhynchonellata - Orthida - Draboviidae
Salopina sp. Boucot 1960
Rhynchonellata - Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
Rhynchonellata - Orthida - Dicoelosiidae
Rhynchonellata - Orthida - Hesperorthidae
Dolerorthis sp. Schuchert and Cooper 1931
Ptychopleurella sp. Schuchert and Cooper 1931
Rhynchonellata - Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
Rhynchonellata - Athyridida - Meristellidae
Meristina sp. Hall 1867
Rhynchonellata - Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
Ostracoda - Palaeocopida
Trilobita - Phacopida - Encrinuridae
Encrinurus sp. Emmrich 1844
Anthozoa - Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813
see common names

Geography
Country:United States State/province:Nevada
Coordinates: 39.8° North, 116.3° West (view map)
Paleocoordinates:17.2° South, 124.2° West (Wright 2013)
Basis of coordinate:based on political unit
Time
Period: Silurian Epoch: Llandovery
10 m.y. bin: Silurian 1
*Epoch:Late/Upper Llandovery
Key time interval: Llandovery
Age range of interval: 443.8 - 433.4 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Roberts Mountain
Stratigraphy comments: "upper Llandovery"
Lithology and environment
Primary lithology:black "limestone"
Secondary lithology: "shale"
Environment:marine indet.
Geology comments: "ls overlying black graptolitic shale"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Taxonomic list comments:"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"
Metadata
Database number:467
Authorizer:J. Sepkoski Enterer:M. Sommers
Modifier:J. Ju Research group:marine invertebrate
Created:1999-03-25 18:04:14 Last modified:2025-02-22 15:12:02
Access level:the public Released:1999-03-25 18:04:14
Creative Commons license:CC0
Reference information

Primary reference:
60972. 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]