Ingta Formation
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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 ichnofauna comprises subhorizontal ''Planolites'' burrows; above it, '' Phycodes'' burrows immediately appear, with Nemakit-Daldyn SSFs appearing soon after.


Stratigraphy

The formation is overlain by either the Backbone Ranges Formation and the Vampire Formation, depending on the locality. These two formations have a common base with the Ingta formation, and both continue onwards until the base of the Sekwi Formation.


Depositional environment

The rocks are submarine, and were deposited in a nearshore to offshore location on the continental shelf, with no freshwater influence evident—although overlying units bear evidence of deltaic and braided river deposits.


Palaeontology

The formation has yielded a range of SSFs including eggs and embryos, anabaritids, '' Protohertzina'', '' Zhejiangorhabdion'', and phosphatized tubes, spines and plates.


References

Cambrian System of North America {{geologic-formation-stub