Fermeuse Formation

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Fermeuse Formation
Stratigraphic range: Ediacaran 560 Ma
↓
File:Fermeuse Formation photo.jpg
Beds of the Fermeuse Formation near Ferryland, NL; note Aspidella discs
TypeFormation
Unit ofSt John's Group[1]
UnderliesRenews Head Formation[2]
OverliesTrepassey Formation
Thickness1400 m (4,593 ft)[3]
Lithology
PrimaryGray Shale[4]
OtherSandstone, Siltstone[4]
Location
RegionNewfoundland and Labrador
CountryCanada
File:Fermeuse Formation map.svg
Occurrence of Fermeuse formation in southeast Newfoundland

The Fermeuse Formation is a fossil-bearing Ediacaran geologic formation in Newfoundland.

Depositional environment

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On Bonavista Peninsula the depositional environment was a slope and outer shelf–below photic zone Turbidites probably were the dominant sediment transporters.[5]

It is predominantly silts and sands, in contrast to underlying Trepassey Formation, which is mostly dark grey shales. There is a coarsening up sequence throughout the two formations, such that the top of the Fermeuse is predominantly sandstones.[5]

On Avalon Peninsula there were much shallower waters, particularly than in underlying Mistaken Point Formation and Trepassey Formation.[1] It is indicated by sandy channel fills, slumping, occasional silts.[1] There is a possible delta front and shallow slope setting.[1]

Paleobiota

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File:Aspidella specimens.jpg
1-2 centimetre-wide Aspidella discs (and some smaller mm-sized individuals) on a bedding surface of the Fermeuse Formation near Ferryland, Newfoundland

On Avalon Peninsula[1] there is low diversity, and includes rare trace fossils, Palaeopascichnus,[6] and Aspidella discs,[7] sometimes in great concentrations.[5]

On Bonavista Peninsula there is higher diversity, including more fronds (rangeomorphs) and better preserved than on Avalon Peninsula.[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.

Petalonamae

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Genus Species Notes Images
Arborea[8]
  • A. spinosa
  • A. arborea(?)
 Sessile frondose organism, A. spinosa was previously described as a species of Charniodiscus. A. arborea may be considered belonging to Charniodiscus.[8]
File:Charniodiscus arboreus (TMP 1993.140.0001), Royal Tyrrell Museum, Drumheller, Alberta, 2025-07-13.jpg
Bradgatia[7]
  • B. linfordensis
 Sessile frondose organism.
File:Bradgatia.svg
Charnia[7]
  • C. masoni
 Sessile frondose organism.
File:Charnia.png
Charniodiscus[7]
  • Charniodiscus sp.
  • C. arboreus(?)
 Sessile frondose organism. C. arboreus may be considered belonging to Arborea.[8]
File:Charniodiscus.png
Fractofusus[7]
  • F. andersoni
 Sessile spindle-like frondose organism.
File:Fractofusus.jpg
Primocandelabrum[7]
  • Primocandelabrum sp.
  • P. heimaloranum
 Sessile frondose organism.
File:Primocandelabrum.jpg
Vinlandia[9]
  • V. antecedens
 Sessile frondose organism, previously reported as a species of Charnia.[7]

Cnidaria

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Genus Species Notes Images
Haootia[10]
  • H. quadriformis
 Staurozoan cnidarian.
File:Haootia reconstruction 2024.jpg
Hiemalora[7]
  • H. stellaris
 Discoid organism, possibly holdfasts of petalonamids.

incertae sedis

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Genus Species Notes Images
Aspidella[7][3]
  • A. terranovica
 Enigmatic discoidal fossil.
File:Aspidella surface.jpg
Hadrynichorde[7]
  • H. catalinensis
 Sea Whip-like frondose organism.
Palaeopascichnus[1][11]
  • P. delicatus
 Palaeopascichnid organism.
File:Palaeopascichnus CU21.png

Ivesheadiomorphs

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Genus Species Notes Images
Ivesheadia[7]
  • I. lobata
 Poorly preserved organism.

Ichnogenera

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Genus Species Notes Images
Neonereites[11]
  • Neonereites sp.
 Burrows.
File:Neonereites uniserialis Punta San García 01.JPG

See also

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References

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