Early Tremadoc section, La Silla Fm., Cerra la Silla (Ordovician of Argentina)

Also known as Reef 4098

Where: Argentina (30.0° S, 69.0° W: paleocoordinates 38.8° S, 128.1° W)

• local area-level geographic resolution

When: Cordylodus angulatus conodont zone, La Silla Formation, Tremadocian (485.4 - 477.7 Ma)

• member-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified shale and grainstone

• shaley biolaminate with grainstone limestone interbeds

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: M. Keller, F. Canas, O. Lehnert and N. E. Vaccari. 1994. The Upper Cambrian and Lower Ordovician of the Precordillera (Western Argentina): Some stratigraphic reconsiderations. Newsletters on Stratigraphy 31(2):115-132 [A. Miller/P. Novack-Gottshall/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 8880: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 02.09.2000, edited by Mihaela Krause

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Ptychopariida - Plethopeltidae
Conodonta
 Protopanderodontida - Clavohamulidae
 Protopanderodontida - Oneotodontidae
Oneotodus sp. Lindström 1955 conodont
Teridontus sp. Miller 1980 conodont
 Proconodontida - Cordylodontidae
Cordylodus lindstromi Druce and Jones 1971 conodont
Cordylodus intermedius Furnish 1938 conodont
Cordylodus angulatus Pander 1856 conodont
Demospongiae
 Chaetetida - Cryptolichenariidae
Amsassia argentina n. sp. chaetetid sponge
Nuia
  -
Nuia sp. Maslov 1954
 Ichnofossils -