Terreneuvian

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Terreneuvian
538.8 ± 0.6 – ~521 Ma
A map of Earth as it appeared 530 million years ago during the Terreneuvian Series, Fortunian Stage
Delegates from the Ichnia 2012 conference inspect the Global Boundary Stratotype Section and Point (GSSP) for the Ediacaran-Cambrian boundary at Fortune Head Ecological Reserve, Newfoundland, Canada.
Chronology
−540 —
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−535 —
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−530 —
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−525 —
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−520 —
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−515 —
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−510 —
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−505 —
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−500 —
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−495 —
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−490 —
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−485 —
Np
Paleozoic
Cambrian
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S
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2
M
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Early O
Fortunian
"Stage 2"
"Stage 3"
"Stage 4"
Wuliuan
Drumian
Guzhangian
Paibian
Jiangshanian
"Stage 10"
Ediacaran
 
 
 
 
←
Orsten Fauna
←
Dresbachian extinction
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←
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Archaeocyatha extinction
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←
←
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SSF diversification, first brachiopods & archaeocyatha
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←
Subdivision of the Cambrian according to the ICS, as of 2024.[1]
Vertical axis scale: Millions of years ago
Etymology
Name formalityFormal
Name ratifiedSeptember 2007[2]
Former name(s)Cambrian Stage 1
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitEpoch
Stratigraphic unitSeries
First proposed byEd Landing, 2007[3]
Time span formalityFormal
Lower boundary definitionAppearance of the Ichnofossil Treptichnus pedum
Lower boundary GSSPFortune Head section, Newfoundland, Canada
Lua error: callParserFunction: function "#coordinates" was not found.
Lower GSSP ratifiedSeptember 2007 (as base of Terreneuvian and Fortunian)[2]: 287 
Upper boundary definitionNot formally defined
Upper boundary definition candidatesFAD of Trilobites
Upper boundary GSSP candidate section(s)None
Upper GSSP ratifiedNot formally defined

The Terreneuvian is the lowermost and oldest series of the Cambrian geological system.[2] Its base is defined by the first appearance datum of the trace fossil Treptichnus pedum around 538.8 million years ago. Its top is defined as the first appearance of trilobites in the stratigraphic record around 521 million years ago.[4] This series' name was formally accepted by the International Commission on Stratigraphy in 2007.[2]

The Fortunian stage and presently unnamed Cambrian Stage 2 are the stages within this series. The Terreneuvian corresponds to the pre-trilobitic Cambrian.[5]

The name Terreneuvian is derived from Terre Neuve, the French name for the island of Newfoundland, Canada, where many rocks of this age are found, including the type section.[2][4]

GSSP

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The type locality (GSSP) of the Terreneuvian is in Fortune Head, at the northern edge of the Burin Peninsula, Newfoundland, Canada (Lua error: callParserFunction: function "#coordinates" was not found.). The outcrops show a carbonate-siliciclastic succession which is mapped as the Chapel Island Formation. The formation is divided into the following members that are composed of peritidal sandstones and shales (Member 1), muddy deltaic and shelf sandstones and mudstones (Member 2A), laminated siltstones (Member 2B and 3) and mudstones and limestones of the inner shelf (Member 4). The Precambrian-Cambrian boundary lies 2.4 m above the base of the second member, which is the lowest occurrence of Treptichnus pedum. The traces can be seen on the lower surface of the sandstone layers. The first calcareous shelled skeletal fossils (Ladatheca cylindrica) are 400 m above the boundary. The first trilobites appear 1400 m above the boundary, which corresponds to the beginning of the Branchian Series (Series 2).[6]

Major events

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The second phase of the Cambrian explosion occurs during the Terreneuvian. Lots of lophotrochozoan and calcified basal metazoan lineages appeared in this epoch. However, deuterostomes are absent in this interval.[7]

See also

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References

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  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  2. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Open access icon
  3. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  4. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
[edit | edit source]
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).


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