Acoite Fm., Los Colorados and Quebrada Chamarra, Argentina (Ordovician of Argentina)

Where: Argentina (24.0° S, 66.0° W: paleocoordinates 42.2° S, 130.0° W)

• local area-level geographic resolution

When: Acoite Formation, Arenig (478.6 - 466.0 Ma)

• They report this as Middle Arenig, probably corresponding with the Whitlandian

• formation-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, concretionary, gray, green, sandy sandstone and shale

• 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

Collection methods: JA: marked by Novack-Gottshall without explanation as omitting some genera, some macrofossils, some microfossils, and species names, but apparently complete

Primary reference: 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]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 8777: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 29.08.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• Paleoecology and rostroconch and bivalve taxonomy
Trilobita
 Phacopida - Homalonotidae
Colpocoryphe sp. Novak and Perner 1918 trilobite
 Phacopida - Calymenidae
Neseuretus sp. Hicks 1873 trilobite
 Phacopida - Pliomeridae
Pliomeridius sp. Leanza and Baldis 1975 trilobite
 Asaphida - Asaphidae
Hoekaspis sp. Kobayashi 1937 trilobite
"Megalaspis sp." = Megistaspis Jaanusson 1956 trilobite
Araiocaris sp. Pribyl and Vanek 1980 trilobite
Megalaspidella sp. Kobayashi 1937 trilobite
Zuninaspis sp. Harrington and Leanza 1957 trilobite
Australopyge sp. Harrington and Leanza 1957 trilobite
Niobides sp. Harrington and Leanza 1957 trilobite
Ogyginus sp. Raymond 1912 trilobite
Branisaspis sp. Pribyl and Vanek 1980 trilobite
Thysanopyge sp. Kayser 1898 trilobite
Merlinia sp. Fortey and Owens 1987 trilobite
Kayseraspis sp. Harrington 1938 trilobite
 Asaphida - Alsataspididae
Araiopleura sp. Harrington and Leanza 1957 trilobite
 Asaphida - Raphiophoridae
Rhombampyx sp. Fortey 1975 trilobite
Ampyx sp. Dalman 1827 trilobite
 Asaphida - Trinucleidae
Famatinolithus sp. Harrington and Leanza 1957 trilobite
 Asaphida - Nileidae
Illaenopsis sp. Salter 1865 trilobite
Symphysurus sp. Goldfuss 1843 trilobite
 Proetida - Telephinidae
Carolinites sp. Kobayashi 1940 trilobite
 Ptychopariida - Olenidae
Bienvillia sp. Clark 1924 trilobite
Porterfieldia sp. Cooper 1953 trilobite
Psilocara sp. Fortey 1974 trilobite
Hypermecaspis sp. Harrington and Leanza 1957 trilobite
Rhynchonellata
 Orthida - Heterorthidae
 Orthida - Hesperonomiidae
 Orthida - Glyptorthidae
Glyptorthis sp. Foerste 1914
 Orthida - Orthidae
Paralenorthis sp. Havlicek and Branisa 1980
 Orthida - Plectorthidae
Nanorthis sp. Ulrich and Cooper 1936
Rostroconchia
 Ribeirioida - Technophoridae
Ribeiria sp. Sharpe 1853
 Ribeirioida - Ischyriniidae
Tolmachovia sp. Howell and Kobayashi 1936
Bivalvia
 Palaeotaxodonta - Tironuculidae
Natasia sp. Sánchez 1995 clam
 Modiomorphida - Modiomorphidae
Cosmogoniophora sp. McLearn 1918 clam
 Cardiomorphi - Lipanellidae
"Cosmogoniophorina sp." = Cosmogoniophorina
"Cosmogoniophorina sp." = Cosmogoniophorina Isberg 1934 clam
 Protobranchia - Ctenodontidae
Ctenodonta sp. Salter 1852 clam
Gastropoda
 Bellerophontida - Tropidodiscidae
Peelerophon sp. Yochelson 1982 snail
Graptolithina
 Graptoloida - Phyllograptidae
Phyllograptus sp. Hall 1858 graptoloid
 Graptoloida -
Acrograptus sp. graptoloid
 Graptoloida - Didymograptidae
"Didymograptus deflexus" = Baltograptus deflexus
"Didymograptus deflexus" = Baltograptus deflexus Elles and Wood 1908 graptoloid
 Graptoloida -
Dichograptus sp. graptoloid
 Tetragrapta -
Tetragraptus quadribrachiatus Hall 1858 graptoloid