Vampire Formation Explained

Period:	Cambrian
Type:	Geological formation
Underlies:	Sekwi Formation
Overlies:	Ingta Formation
Thickness:	up to
Location:	Mackenzie Mountains
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]

Notes and References

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