Acoite Fm., Los Colorados and Quebrada Chamarra, Argentina: Arenig, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Pterobranchia - Graptoloidea - Dichograptidae
Dichograptus sp.
Pterobranchia - Graptoloidea - Phyllograptidae
Phyllograptus sp. Hall 1858
Tetragraptus quadribrachiatus (Hall 1858)
Pterobranchia - Graptoloidea - Didymograptidae
Didymograptus deflexus Elles and Wood 1901
recombined as Baltograptus deflexus
Pterobranchia - Graptoloidea - Sinograptidae
Acrograptus sp.
Rostroconchia - Ribeirioida - Technophoridae
Ribeiria sp. Sharpe 1853
Rostroconchia - Ribeirioida - Ischyriniidae
Tolmachovia sp. Howell and Kobayashi 1936
Gastropoda - Bellerophontida - Tropidodiscidae
Peelerophon sp. Yochelson 1982
Bivalvia - Afghanodesmatida - Tironuculidae
Natasia sp. Sánchez 1995
Bivalvia - Solemyida - Ctenodontidae
Ctenodonta sp. Salter 1852
Bivalvia - Modiomorphida - Modiomorphidae
Cosmogoniophora sp. McLearn 1918
Bivalvia - Lipanellidae
Cosmogoniophorina sp. Isberg 1934
original and current combination Cosmogoniophorina
Rhynchonellata - Orthida - Glyptorthidae
Glyptorthis sp. Foerste 1914
Rhynchonellata - Orthida - Hesperonomiidae
Hesperonomiella sp.
Rhynchonellata - Orthida - Orthidae
Paralenorthis sp. Havlicek and Branisa 1980
Rhynchonellata - Orthida - Plectorthidae
Nanorthis sp. Ulrich and Cooper 1936
Desmorthis sp. Ulrich and Cooper 1936
Rhynchonellata - Orthida - Heterorthidae
Incorthis sp. Havlíček and Branisa 1980
Trilobita - Proetida - Telephinidae
Carolinites sp. Kobayashi 1940
Trilobita - Olenida - Olenidae
Hypermecaspis sp. Harrington and Leanza 1957
Psilocara sp. Fortey 1974
Bienvillia sp. Clark 1924
Porterfieldia sp. Cooper 1953
Trilobita - Trinucleida - Alsataspididae
Araiopleura sp. Harrington and Leanza 1957
Trilobita - Trinucleida - Raphiophoridae
Rhombampyx sp. Fortey 1975
Ampyx sp. (Dalman 1827)
original and current combination Asaphus (Ampyx)
Trilobita - Trinucleida - Trinucleidae
Famatinolithus sp. Harrington and Leanza 1957
Trilobita - Asaphida - Asaphidae
Branisaspis sp. Pribyl and Vanek 1980
Kayseraspis sp. Harrington 1938
Megalaspidella sp. Kobayashi 1937
synonym of Asaphellus
Australopyge sp. Harrington and Leanza 1957
Araiocaris sp. Pribyl and Vanek 1980
synonym of Ogygiocaris
Hoekaspis sp. Kobayashi 1937
Megalaspis sp. Angelin 1851
replaced by Megistaspis
Ogyginus sp. Raymond 1912
Thysanopyge sp. Kayser 1898
Niobides sp. Harrington and Leanza 1957
Zuninaspis sp. Harrington and Leanza 1957
Merlinia sp. Fortey and Owens 1987
Trilobita - Asaphida - Nileidae
Illaenopsis sp. Salter 1865
Symphysurus sp. Goldfuss 1843
Trilobita - Phacopida - Homalonotidae
Colpocoryphe sp. Novak and Perner 1918
Trilobita - Phacopida - Calymenidae
Neseuretus sp. Hicks 1873
Trilobita - Phacopida - Pliomeridae
Pliomeridius sp. Leanza and Baldis 1975
see common names

Geography
Country:Argentina
Coordinates: 24.0° South, 66.0° West (view map)
Paleocoordinates:42.2° South, 130.0° West
Geographic resolution:local area
Time
Period:Ordovician
10 m.y. bin:Ordovician 2
*Period:Early/Lower Ordovician *Epoch:Early/Lower Arenig
*International age/stage:Early/Lower Arenig
Key time interval:Arenig
Age range of interval:477.70000 - 468.40000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Acoite
Stratigraphic resolution:formation
Stratigraphy comments: They report this as Middle Arenig, probably corresponding with the Whitlandian
Lithology and environment
Primary lithology:concretionary,gray,green lithified sandy sandstone
Secondary lithology: "shale"
Lithology description: green-gray fine-grained shaley sandstone intercalated with dark gray and yellowish gray shale and sandy shale and sandy limolites and occasional cone-in-cone concretions
Environment:transition zone/lower shoreface
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Collection method comments: JA: marked by Novack-Gottshall without explanation as omitting some genera, some macrofossils, some microfossils, and species names, but apparently complete
Taxonomic list comments:Paleoecology and rostroconch and bivalve taxonomy
Metadata
Database number:8777
Authorizer:A. Miller Enterer:P. Novack-Gottshall
Modifier:J. Alroy Research group:marine invertebrate
Created:2000-08-29 12:06:00 Last modified:2007-02-21 19:26:07
Access level:the public Released:2000-11-20 13:53:41
Creative Commons license:CC BY
Reference information

Primary reference:
668. T. M. Sanchez and B.G. Waisfeld. 1995. Benthic assemblages in the northwestern of Gondwana: A test of the Ordovician evolutionary radiation model. In J.D. Cooper, M.L. Droser, S.C. Finney (eds.), Ordovician Odyssey: Short papers for the seventh international symposium on the Ordovician system 409-412 [A. Miller/P. Novack-Gottshall/P. Wagner]