The Vampire Formation is a formation of delta-front siliciclastics deposited in the early Cambrian. The upper unit is trilobitic Cambrian. Some authors place the underlying Ingta formation at least partially in the Cambrian; in places it overlies the sub-Cambrian unconformity.
It contains a rich array of trace fossils spanning the pre-trilobitic Cambrian, including some found only there (once interpreted as sponge-like forms); its uppermost strata contain ''Fallotaspis''-zone trilobites, whereas its lower levels come above Protohertzina and Anabarites-bearing shelly layers in the
Ingta formation
The Ingta Formation is a geological unit containing green sandstones and shales; it crops out in the Canadian Mackenzie Mountains.
Its age is poorly constrained, though it straddles the Precambrian/Cambrian boundary. Below the boundary its ichnofa ...
; as such, it spans much of the Fortunian.
[ ]
References
{{Reflist
Cambrian System of North America