Vampire Formation

Vampire Formation

Stratigraphic range: Cambrian
TypeGeological formation
UnderliesSekwi Formation
OverliesIngta Formation
Thicknessup to
Location
LocationMackenzie 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. 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.