Radiolarians from the Hanson Creek Formation, Nevada (Ordovician of the United States)

Where: Eureka County, Nevada (39.2° N, 116.4° W: paleocoordinates 6.4° S, 77.1° W)

• coordinate based on nearby landmark

When: Hanson Creek Formation, Caradoc (458.4 - 449.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: basinal (); gray, argillaceous lime mudstone

• Environments from S. Holland.
• Very dark gray fissile argillaceous limestone containing numerous crushed graptolites. Successive concretion seams are separated by variable thicknesses of dark gray, grayish orange weathering, platy argillaceous limestone. Lithology taken from Dunham & Murphy, 1976.

Size class: microfossils

Preservation: replaced with dolomite

Collection methods: chemical,

Primary reference: G. W. Renz. 1990. Late Ordovician (Caradocian) radiolarians from Nevada. Micropaleontology 36(4):367-377 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 13498: authorized by Steven Holland, entered by Tori Hanson on 07.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Protozoa
 Archaeospicularia - Secuicollactidae
Secuicollacta stelligera n. sp., Palaeosphaera micra n. gen. n. sp.
Secuicollacta stelligera n. sp. Renz 1990 radiolarian
Palaeosphaera micra n. gen. n. sp. Renz 1990 radiolarian
 Albaillellaria - Ceratoikiscidae
? Ceratoikiscum sp.
? Ceratoikiscum sp. Deflandre 1953 radiolarian
 Entactinaria - Entactiniidae
"Entactinia aff. sublata" = Stigmosphaerostylus, Entactinia spongia n. sp.
"Entactinia aff. sublata" = Stigmosphaerostylus radiolarian
Entactinia spongia n. sp. Renz 1990 radiolarian
 Entactinaria - Palaeoscenidiidae
Palaeoephippium octaramosum n. sp., Palaeotrifidus ballator n. gen. n. sp., Palaeotrifidus imbifurcus n. gen. n. sp., Palaeotripus sexabrachiatus n. sp.
Palaeoephippium octaramosum n. sp. Renz 1990 radiolarian
Palaeotrifidus ballator n. gen. n. sp. Renz 1990 radiolarian
Palaeotrifidus imbifurcus n. gen. n. sp. Renz 1990 radiolarian
Palaeotripus sexabrachiatus n. sp. Renz 1990 radiolarian
 Spumellaria -
Kalimnasphaera aff. maculosa
Kalimnasphaera aff. maculosa Webby and Blom 1986 radiolarian