Trepassey Formation | |
---|---|
Stratigraphic range: Ediacaran | |
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.
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
| Notes Uncertain or tentative taxa are in small text; |
Genus | Species | Notes | Images |
---|---|---|---|
Avalofractus [7] [8] |
| Sessile frondose organism. | |
Beothukis [7] [8] |
| Sessile frondose organism. | |
Bradgatia [8] |
| Sessile frondose organism. | ![]() |
Charnia [7] [8] |
| Sessile frondose organism. | ![]() |
Charniodiscus [8] |
| Sessile frondose organism. | ![]() |
Fractofusus [9] |
| Sessile spindle-like frondose organism. | ![]() |
Trepassia [7] [8] |
| Sessile frondose organism. | ![]() |
Genus | Species | Notes | Images |
---|---|---|---|
Haootia [10] |
| Staurozoan cnidarian. | ![]() |
Mamsetia [6] |
| Staurozoan cnidarian. | |
Genus | Species | Notes | Images |
---|---|---|---|
Aspidella [9] [11] |
| Enigmatic discoidal fossil. | ![]() |
Hadrynichorde [9] |
| Sea Whip-like frondose organism. | |
Palaeopascichnus [1] [12] |
| Palaeopascichnid organism. | ![]() |
Genus | Species | Notes | Images |
---|---|---|---|
Ivesheadia |
| Poorly preserved organism. | |
Genus | Species | Notes | Images |
---|---|---|---|
Neonereites [12] |
| Burrows. | |