Rusconi Mbr., Empozada Fm., San Isidro (Ordovician of Argentina)

Where: Argentina (33.0° S, 69.0° W: paleocoordinates 34.5° S, 131.1° W)

• local area-level geographic resolution

When: Oepikodus evae conodont zone, Rusconi Member (Empozada Formation), Floian (477.7 - 470.0 Ma)

• JA: reassigned from the Arenig to the Floian based on presence of T. approximatus and "early Arenig" age call

• member-level stratigraphic resolution

Environment/lithology: slope; lithified, green, argillaceous, calcareous shale

• Tetragraptus quadribrachiatus, T. approximatus, and Oepikodus evae biozones (Early Arenig)
• muddy, dark green shale, dark green laminites, and occ. calcareous breccias

Size class: macrofossils

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: O. L. Bordonaro and S.H. Peralta. 1987. El Arenigiano inferior de la Formacion Empozada en la localidad de San Isidro, Mendoza, Argentina. Actas del decimo congreso geologico Argentino 3:81-84 [A. Miller/P. Novack-Gottshall]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 9034: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 18.09.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Terograptus sp.
Malacostraca
 Archaeostraca - Caryocarididae
Caryocaris sp.
Caryocaris sp. Salter 1863
Pterobranchia
 Graptoloidea - Phyllograptidae
Tetragraptus quadribrachiatus, "Tetragraptus approximatus" = Paratetragraptus approximatus
Tetragraptus quadribrachiatus Hall 1858 graptolite
"Tetragraptus approximatus" = Paratetragraptus approximatus Nicholson 1873 graptolite
 Graptoloidea - Dichograptidae
Didymograptus sp., Clonograptus sp., Dichograptus sp.
Didymograptus sp. McCoy 1851 graptolite
Clonograptus sp. Nicholson 1873 graptolite
Dichograptus sp. graptolite
Conodonta
 Prioniodontida -
Oepikodus evae