Where: Yukon, Canada (65.3° N, 140.9° W: paleocoordinates 0.0° N, 0.0° E)
• coordinate estimated from map
• small collection-level geographic resolution
When: Craggy Dolomite Formation (Fifteenmile Group), Tonian (1000.0 - 850.0 Ma)
• Originally assigned to "Unit 5" of the upper Tindir Group, and thought to be either latest Neoproterozoic or earliest Cambrian. Stratigraphic revisions by Macdonald et al. (2010) determined that the unit is the upper part of the Fifteenmile Group and U/Pb radiometric ages constrained the fossiliferous units to between 811.5 and 717.4 Ma.
• bed-level stratigraphic resolution
Environment/lithology: deep subtidal ramp; lithified, gray, cherty/siliceous lime mudstone
Size class: microfossils
Preservation: permineralized, original carbon, replaced with silica
Collection methods: peel or thin section
• Repository: Canadian National Collection; University of California, Santa Barbara
Primary reference: C. W. Allison and S. M. Awramik. 1989. Organic-walled microfossils from earliest Cambrian or latest Proterozoic Tindir Group rocks, northwest Canada. Precambrian Research 43:253-294 [P. Cohen/M. Hernandez/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 227529: authorized by Matthew Clapham, entered by Matthew Clapham on 14.10.2022
Creative Commons license: CC BY (attribution)
Taxonomic list
Coccogoneae | |
Hormogoneae | |
"Eomycetopsis robusta" = Siphonophycus robustum
"Eomycetopsis robusta" = Siphonophycus robustum Schopf 1968 | |
"Filiconstrictus diminutus" = Filiconstrictosus diminutus, Halythrix cf. nodosa, Palaeolyngbya barghoorniana, Calyptothrix annulata, "Cephalophytarion majesticum" = Oscillatoriopsis majesticum
"Filiconstrictus diminutus" = Filiconstrictosus diminutus Schopf and Blacic 1971
Halythrix cf. nodosa Schopf 1968
Palaeolyngbya barghoorniana Schopf 1968
Calyptothrix annulata Schopf 1968
"Cephalophytarion majesticum" = Oscillatoriopsis majesticum Allison 1989 Cephalophytarion grande in table
| |
Yukonosphaeridion interior | |
Yukonosphaeridion interior n. gen. n. sp.
Yukonosphaeridion interior n. gen. n. sp. Awramik 1989 | |
"Balbariniella praestans" = Balbiriniella praestans Oehler 1978
Hyalocyrillium clardyi Allison 1989
Melanocyrillium sp. Bloeser 1985 | |
Chlorococcaceae | |
Palaeoanacystis magna n. sp.
Palaeoanacystis magna n. sp. Awramik 1989 |