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, Caradocian (460.9 - 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

unclassified
  -
Radiolaria
 Albaillellaria - Ceratoikiscidae
? Ceratoikiscum sp. Deflandre 1953 radiolarian
 Entactinaria - Entactiniidae
"Entactinia aff. sublata" = Stigmosphaerostylus, "Entactinia ? spongia" = Stigmosphaerostylus
"Entactinia aff. sublata" = Stigmosphaerostylus radiolarian
"Entactinia ? spongia" = Stigmosphaerostylus radiolarian
Entactinia? spongia, n.sp.
 Entactinaria - Palaeoscenidiidae
"Palaeotripus sexabrachiatus n. sp." = Palaeodecaradium, "Palaeotrifidus ballator n. gen. n. sp." = Palaeoephippium, "Palaeotrifidus imbifurcus n. gen. n. sp." = Palaeoephippium
"Palaeotripus sexabrachiatus n. sp." = Palaeodecaradium radiolarian
"Palaeotrifidus ballator n. gen. n. sp." = Palaeoephippium radiolarian
"Palaeotrifidus imbifurcus n. gen. n. sp." = Palaeoephippium radiolarian
 Spumellaria -
 Archaeospicularia - Secuicollactidae
"Secuicollacta stelligera n. sp." = Secuicollacta, "Palaeosphaera micra n. gen. n. sp." = Secuicollacta
"Secuicollacta stelligera n. sp." = Secuicollacta radiolarian
"Palaeosphaera micra n. gen. n. sp." = Secuicollacta radiolarian