Trepassey Formation

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.

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

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