Blueflower Formation

Geologic formation in the Northwest Territories, Canada From Wikipedia, the free encyclopedia

The Blueflower Formation is a geologic formation in the Northwest Territories, and is a part of the Rackla Group.[1] It preserves fossils dating back to the Ediacaran period.[3]

Unit ofRackla Group[1]
Sub-unitsLower and Upper Member
UnderliesRisky Formation[1]
Quick facts Type, Unit of ...
Blueflower Formation
Stratigraphic range: Ediacaran 567.3 Ma[1]
TypeFormation
Unit ofRackla Group[1]
Sub-unitsLower and Upper Member
UnderliesRisky Formation[1]
OverliesGametrail Formation[1]
Lithology
PrimarySiliciclastic[2]
OtherLimestone, Mudstone, Siltstone, Sandstone[2]
Location
RegionNorthwest Territories
CountryCanada
Close

Paleobiota

Unlike most other Ediacaran formations, the Blueflower Formation is unique in that is preserves shallow and deep-marine environments, and as it correlates with other Avalonian formations such as those in Newfoundland and Labrador, it allowed scientists to figure out whether the Ediacaran Biota started out in deep-marine environments before making their way into shallower waters.[1] The forms that can be found across the formation are the familiar Petalonamae such as Charniodiscus, including juvenile petalonamids from the Lower Member, and from the Upper Member tubular forms such as Annulatubus, and the enigmatic Windermeria.[1]

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Proarticulata

More information Genus, Species ...
Genus Species Notes Images
Windermeria[4][1]
  • W. aitkeni
Elongated motile organism.
Close

Petalonamae

More information Genus, Species ...
Genus Species Notes Images
Charniodiscus[5][1]
  • Charniodiscus sp.
Frondose organism.
Juvenile Fronds[1]
  • Arborea ?
  • Charniodiscus ?
  • Trepassia ?
Juvenile frondose organisms, exact genus affinities unknown.
Pteridinium[6]
  • Pteridinium sp.
Frondose organism.
Close

Cnidarian

More information Genus, Species ...
Genus Species Notes Images
Ediacaria[5][7]
  • E. flindersi
Discoid organism.
Kullingia[5][7]
  • Kullingia sp.
Discoid organism.
Close

incertae sedis

More information Genus, Species ...
Genus Species Notes Images
Annulatubus[3]
  • A. flexuosus
Tubular organism.
Aspidella[1][8]
  • A. terrinovica
Discoid organism.
Cyclomedusa[5]
  • Cyclomedusa sp.
Discoid organism.
Hiemalora[4]
  • H. pleiomorphus
Discoid organism, possibly holdfasts of petalonamids.
Sekwia[7]
  • S. excentria
Discoid organism.
Sekwitubulus[3]
  • S. annularis
Tubular organism.
Close

Flora

More information Genus, Species ...
Genus Species Notes Images
Beltanelliformis[5][1][8]
  • B. brunsae
Cyanobacterial colony.
Close

Ichnogenera

More information Genus, Species ...
Genus Species Notes Images
Archaeonassa[3]
  • Archaeonassa isp.
Burrows.
Gordia[5]
  • G. marina
Burrows.
Helminthoidichnites[7][3]
  • Helminthoidichnites isp.
Burrows.
Helminthopsis[7][3]
  • H. abeli
  • H. irregularis
  • Helminthopsis isp.
Burrows.
Planolites[7][3]
  • P. monatanus
Burrows.
Torrowangea[3]
  • Torrowangea isp.
Burrows.
Close

Undescribed

More information Genus, Species ...
Genus Species Notes Images
problematicum[1]
  • ???
Curves and loops around, affinities unknown.
Close

See also

References

Related Articles

Wikiwand AI