Vampire Formation

Vampire Formation
Stratigraphic range: Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Sekwi Formation
Overlies	Ingta Formation
Thickness	up to
Location
Location	Mackenzie Mountains
Region	Northwest Territories
Country	Canada

The Vampire Formation is a formation of delta-front siliciclastics deposited in the early Cambrian. The upper unit is trilobitic Cambrian. ^[1] Some authors place the underlying Ingta formation at least partially in the Cambrian; in places it overlies the sub-Cambrian unconformity. ^[2]

It contains a rich array of trace fossils spanning the pre-trilobitic Cambrian, ^[3] including some found only there (once interpreted as sponge-like forms); ^[4] its uppermost strata contain Fallotaspis-zone trilobites, whereas its lower levels come above Protohertzina and Anabarites-bearing shelly layers in the Ingta formation; as such, it spans much of the Fortunian. ^[5]

References

1. MacNaughton, Robert; Dalrymple, Robert; Narbonne, Guy (1997). "Early Cambrian braid-delta deposits, Mackenzie Mountains, north-western Canada". Sedimentology. 44 (4): 587–609. Bibcode:1997Sedim..44..587M. doi:10.1046/j.1365-3091.1997.d01-41.x. S2CID   129528311.
2. MacNaughton, Robert; Dalrymple, Robert; Narbonne, Guy (1997). "Early Cambrian braid-delta deposits, Mackenzie Mountains, north-western Canada". Sedimentology. 44 (4): 587–609. Bibcode:1997Sedim..44..587M. doi:10.1046/j.1365-3091.1997.d01-41.x. S2CID   129528311.
3. MacNaughton, Robert B.; Narbonne, Guy M. (1 April 1999). "Evolution and ecology of Neoproterozoic-Lower Cambrian trace fossils, NW Canada". PALAIOS. 14 (2): 97–115. Bibcode:1999Palai..14...97M. doi:10.2307/3515367. JSTOR   3515367.
4. Hofmann, H. J. (1983). "Early Cambrian problematic fossils near June Lake, Mackenzie Mountains, N.W.T.". Canadian Journal of Earth Sciences. 20 (10): 1513–1520. Bibcode:1983CaJES..20.1513H. doi:10.1139/e83-140.
5. Pyle, Leanne J.; Narbonne, Guy M.; James, Noel P.; Dalrymple, Robert W.; Kaufman, Alan J. (2004). "Integrated Ediacaran chronostratigraphy, Wernecke Mountains, northwestern Canada". Precambrian Research. 132 (1–2): 1–27. Bibcode:2004PreR..132....1P. CiteSeerX   10.1.1.540.9008 . doi:10.1016/j.precamres.2004.01.004.