Sekwi Formation

Sekwi Formation
Sekwi Formation
Stratigraphic range: Atdabanian(approx.) PreꞒ Ꞓ O S D C P T J K Pg N ↓; Fallotaspis, Nevadella, and Bonnia-Olenellus trilobite zones
Type	Formation
Underlies	Hess River Formation ; Rockslide Formation ;
Overlies	Vampire Formation ; Backbone Ranges Formation ; Ingta Formation (where the above are absent);
Thickness	700 m
Location
Region	Northwest Territories
Country	Canada

Last updated September 22, 2025

The Sekwi Formation is a geologic formation in Northwest Territories, Canada, which preserves fossils dating back to the Cambrian period.

The formation principally comprises shallow water carbonates, but deepens to include mid-shelf mudstones, both calcareous and siliciclastic.^[2]

It dates from c. 525-510 Ma, the Nevadella / Bonnia-Olenellus trilobite zones.^[3]

References

↑ Dewing, K.; Sharp, R J; Ootes, L; Turner, E C; Gleeson, S (2006). Geological Survey of Canada, Current Research (Online) no. 2006-A4. Natural Resources Canada. ISBN 9780662431343.
1 2 3 4 RANDELL, ROBERT D.; LIEBERMAN, BRUCE S.; HASIOTIS, STEPHEN T.; POPE, MICHAEL C. (September 2005). "New Chancelloriids From the Early Cambrian Sekwi Formation With a Comment on Chancelloriid Affinities". Journal of Paleontology. 79 (5): 987–996. doi:10.1666/0022-3360(2005)079[0987:NCFTEC]2.0.CO;2. S2CID 130292492.
↑ Dilliard, K.A.; Pope, M.C.; Coniglio, M.; Hasiotis, S.T.; Lieberman, B.S. (2007). "Stable isotope geochemistry of the lower Cambrian Sekwi Formation, Northwest Territories, Canada: Implications for ocean chemistry and secular curve generation". Palaeogeography, Palaeoclimatology, Palaeoecology. 256 (3–4): 174–194. Bibcode:2007PPP...256..174D. doi:10.1016/j.palaeo.2007.02.031.

Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 17 December 2021.

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[1] Dewing, K.; Sharp, R J; Ootes, L; Turner, E C; Gleeson, S (2006). Geological Survey of Canada, Current Research (Online) no. 2006-A4. Natural Resources Canada. ISBN 9780662431343.

[Randell2005-2] 1 2 3 4 RANDELL, ROBERT D.; LIEBERMAN, BRUCE S.; HASIOTIS, STEPHEN T.; POPE, MICHAEL C. (September 2005). "New Chancelloriids From the Early Cambrian Sekwi Formation With a Comment on Chancelloriid Affinities". Journal of Paleontology. 79 (5): 987–996. doi:10.1666/0022-3360(2005)079[0987:NCFTEC]2.0.CO;2. S2CID 130292492.

[3] Dilliard, K.A.; Pope, M.C.; Coniglio, M.; Hasiotis, S.T.; Lieberman, B.S. (2007). "Stable isotope geochemistry of the lower Cambrian Sekwi Formation, Northwest Territories, Canada: Implications for ocean chemistry and secular curve generation". Palaeogeography, Palaeoclimatology, Palaeoecology. 256 (3–4): 174–194. Bibcode:2007PPP...256..174D. doi:10.1016/j.palaeo.2007.02.031.

[1]

[2]

[3]

Sekwi Formation
Stratigraphic range: Atdabanian^[1](approx.) PreꞒ Ꞓ O S D C P T J K Pg N ↓ ; Fallotaspis, Nevadella, and Bonnia-Olenellus trilobite zones^[2]
Type	Formation
Underlies	Hess River Formation Rockslide Formation
Overlies	Vampire Formation Backbone Ranges Formation Ingta Formation (where the above are absent)^[2]
Thickness	700 m^[2]
Location
Region	Northwest Territories
Country	Canada

Sekwi Formation

See also

References