Snowshoe Formation, Oregon, USA (Locality 555) (Jurassic of the United States)

Where: Grant County, Oregon (44.0° N, 119.5° W: paleocoordinates 34.5° N, 59.5° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Snowshoe Formation, Early/Lower Bajocian (171.6 - 168.4 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lenticular, brown, gray lime mudstone

• Brown to reddish brown shales with lenticular masses and nodules of brown to gray calcilutite bearing calcified and silicified Radiolaria. Sample from limestone nodule 230 ft above the contact with underlying Hyde Formation.

Size class: microfossils

Preservation: replaced with calcite, replaced with silica

Primary reference: E. A. Pessagno, Jr. and C.D. Blome. 1980. Upper Triassic and Jurassic Pantanelliinae from California, Oregon, and British Columbia. Micropaleontology 26(3):225-273 [A. Miller/K. Layou/D. Schramm]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 32730: authorized by Arnold Miller, entered by Karen Layou on 14.07.2003, edited by Adam Kocsis

Creative Commons license: CC BY (attribution)

Taxonomic list

• Abundance data given as rare (1-2 specimens); common (3-5 specimens); and abundant (6+ specimens). Data recorded as 1, 3, 6 specimens for rare, common, abundant, respectively.
Show authors, comments, and common names
Protozoa
 Actinommacea - Xiphostylidae
Xiphostylus spp.3
Xiphostylus spp.3 Haeckel 1881 radiolarian
 Nassellaria - Hsuidae
"Lupherium officerense" = Parahsuum officerense4, Hsuum belliatulum4, Hsuum rosebudense4
"Lupherium officerense" = Parahsuum officerense4 Pessagno and Whalen 1982 radiolarian
Hsuum belliatulum4 Pessagno and Whalen 1982 radiolarian
Hsuum rosebudense4 Pessagno and Whalen 1982 radiolarian
 Nassellaria - Bagotidae
? Droltus probosus4
? Droltus probosus4 Pessagno and Whalen 1982 radiolarian
 Nassellaria - Parvicingulidae
Parvicingula matura4
Parvicingula matura4 Pessagno and Whalen 1982 radiolarian
 Nassellaria - Plagiacanthidae
Tetrarchiplagia yehae1
Tetrarchiplagia yehae1 radiolarian
"many" specimens
 Entactinaria - Entactiniidae
Tardentactinia oregonensis n. sp.2
Tardentactinia oregonensis n. sp.2 Dumitrica 2013 radiolarian
 Spumellaria - Pantanelliidae
Gorgansium sp., Pantanellium butonense n. sp., Pantanellium cumshewaense, Pantanellium latum n. sp., Pantanellium sp., Zartus dickinsoni, Zartus praejonesi n. sp., Zartus sp., Zartus jurassicus, Zartus thayeri, Trillus elkhornensis
Gorgansium sp. Pessagno and Blome 1980 radiolarian
Pantanellium butonense n. sp. radiolarian
Pantanellium latum n. sp. radiolarian
Pantanellium sp. Pessagno 1977 radiolarian
Zartus dickinsoni radiolarian
Zartus praejonesi n. sp. radiolarian
Zartus sp. Pessagno and Blome 1980 radiolarian
Zartus jurassicus Pessagno and Blome 1980 radiolarian
Zartus thayeri Pessagno and Blome 1980 radiolarian
Trillus elkhornensis Pessagno and Blome 1980 radiolarian
1Dumitrica 2004; 2Dumitrica 2013; 3Pessagno et al. 1989; 4Pessagno and Whalen 1982