Trepassey Formation

Trepassey Formation
Stratigraphic range: Ediacaran 565–560  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Formation
Unit of	St John's Group [1] [2]
Sub-units	Port Union and Catalina Members [3]
Underlies	Fermeuse Formation [2]
Overlies	Mistaken Point Formation [4] [2]
Thickness	300 m (984 ft)
Lithology
Primary	Gray Sandstone [2]
Other	Shale, Tuff [2]
Location
Region	Newfoundland
Country	Canada
Occurrence in southeast NL

The Trepassey Formation is a geologic formation that crops out in Newfoundland, which consists of gray sandstones and tuffaceous rocks. ^[2] It preserves fossils dating back to the Ediacaran period.

Paleobiota

Like the other overlying and underlying formations, the Trepassey Formation represents a rare deep-marine paleoenviroment, situated on a slope, ^[5] which was home to various sessile forms, like the petalonamids Fractofusus and Trepassia, and even rare examples of life, like the staurozoan cnidarian Mamsetia, previously the paratype of Haootia. ^[6]

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

Genus	Species	Notes	Images
Avalofractus [7] [8]	A. abaculus	Sessile frondose organism.
Beothukis [7] [8]	B. mistakensis	Sessile frondose organism.
Bradgatia [8]	Bradgatia sp.	Sessile frondose organism.
Charnia [7] [8]	C. masoni	Sessile frondose organism.
Charniodiscus [8]	C. procerus	Sessile frondose organism.
Fractofusus [9]	Fractofusus sp.	Sessile spindle-like frondose organism.
Trepassia [7] [8]	T. wardae	Sessile frondose organism.

Cnidaria

Genus	Species	Notes	Images
Haootia [10]	H. quadriformis	Staurozoan cnidarian.
Mamsetia [6]	M. manunis	Staurozoan cnidarian.

incertae sedis

Genus	Species	Notes	Images
Aspidella [9] [11]	A. terranovica	Enigmatic discoidal fossil.
Hadrynichorde [9]	H. avlonica.	Sea Whip-like frondose organism.
Palaeopascichnus [1] [12]	Palaeopascichnus sp.	Palaeopascichnid organism.

Ivesheadiomorphs

Genus	Species	Notes	Images
Ivesheadia	Ivesheadia sp.	Poorly preserved organism.

Ichnogenera

Genus	Species	Notes	Images
Neonereites [12]	Neonereites sp.	Burrows.

See also

• Earth sciences portal
• Canada portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Newfoundland and Labrador

References

1. A.G. Liu; D. McIlroy (September 2014). "Horizontal Surface Traces from the Fermeuse Formation, Ferryland (Newfoundland, Canada), and their Place within the Late Ediacaran Ichnological Revolution" (PDF). Geological Association of Canada - Special Paper (9).^{[ dead link ]}
2. "GEOLOGY OF THE AVALON PENINSULA, NEWFOUNDLAND" (PDF).
3. Liu, Alexander G.; Matthews, Jack J.; McIlroy, Duncan (January 2016). "The B eothukis / C ulmofrons problem and its bearing on E diacaran macrofossil taxonomy: evidence from an exceptional new fossil locality". Palaeontology. 59 (1): 45–58. doi:10.1111/pala.12206. hdl: 1983/605900ac-5976-4d0a-a4a7-dfc6aefd1566 .
4. "Newfoundland and Labrador Map". Geoscience Atlas. Retrieved 2024-07-22.
5. Wood, Donald A; Dalrymple, Robert W; Narbonne, Guy M; Gehling, James G; Clapham, Matthew E (1 October 2003). "Paleoenvironmental analysis of the late Neoproterozoic Mistaken Point and Trepassey formations, southeastern Newfoundland". Canadian Journal of Earth Sciences. 40 (10): 1375–1391. doi:10.1139/e03-048.
6. McIlroy, D.; Pasinetti, G.; Pérez-Pinedo, D.; McKean, C.; Dufour, S. C.; Matthews, J. J.; Menon, L. R.; Nicholls, R.; Taylor, R. S. (September 2024). "The Palaeobiology of Two Crown Group Cnidarians: Haootia quadriformis and Mamsetia manunis gen. et sp. nov. from the Ediacaran of Newfoundland, Canada". Life. 14 (9): 1096. Bibcode:2024Life...14.1096M. doi: 10.3390/life14091096 . ISSN   2075-1729. PMC   11432848 . PMID   39337880.
7. Narbonne, Guy M.; Laflamme, Marc; Greentree, Carolyn; Trusler, Peter (July 2009). "Reconstructing a lost world: Ediacaran rangeomorphs from Spaniard's Bay, Newfoundland". Journal of Paleontology. 83 (4): 503–523. doi:10.1666/08-072R1.1.
8. Mckean, Christopher; Taylor, Rod S.; Mcilroy, Duncan (December 2023). "New taphonomic and sedimentological insights into the preservation of high-relief Ediacaran fossils at Upper Island Cove, Newfoundland". Lethaia. 56 (4): 1–17. doi: 10.18261/let.56.4.2 .
9. Hofmann, H. J.; O'Brien, S. J.; King, A. F. (January 2008). "Ediacaran biota on Bonavista Peninsula, Newfoundland, Canada". Journal of Paleontology. 82 (1): 1–36. doi:10.1666/06-087.1.
10. Liu, Alexander G.; Matthews, Jack J.; Menon, Latha R.; McIlroy, Duncan; Brasier, Martin D. (22 October 2014). "Haootia quadriformis n. gen., n. sp., interpreted as a muscular cnidarian impression from the Late Ediacaran period (approx. 560 Ma)". Proceedings of the Royal Society B: Biological Sciences. 281 (1793) 20141202. doi:10.1098/rspb.2014.1202. PMC   4173675 .
11. Gehling, James G.; Narbonne, Guy M.; Anderson, Michael M. (September 2000). "The first named Ediacaran body fossil, Aspidella Terranovica". Palaeontology. 43 (3): 427–456. doi:10.1111/j.0031-0239.2000.00134.x.
12. Liu, Alexander G.; Kenchington, Charlotte G.; Mitchell, Emily G. (June 2015). "Remarkable insights into the paleoecology of the Avalonian Ediacaran macrobiota". Gondwana Research. 27 (4): 1355–1380. doi:10.1016/j.gr.2014.11.002. hdl: 1983/ef181134-4023-4747-8137-ed9da7a97771 .

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 25 March 2022. Retrieved 17 December 2021.