| 词条 | Ingta Formation |
| 释义 |
| name = Ingta Formation | period = Cambrian | age = {{Fossil range|Ediacaran|Lower Cambrian|PS=(?)|ref=[1]}} | image = | imagesize = | caption = | type = Geological formation | prilithology = Interbedded Shale & Sandstone | otherlithology = Subordinate limestone units | unitof = | subunits = | underlies = | overlies = | thickness = up to {{Convert|312|m|ft|-1}} | area = | map = | map_caption = | location | coordinates = | region = | country = {{Flag|Canada}} | extent = | namedfor = | namedby = | year_ts = | location_ts = | region_ts = | country_ts = | thickness_ts = }} The Ingta Formation is a geological unit containing green sandstones and shales; it crops out in the Canadian Mackenzie Mountains.[2] Its age is poorly constrained, though it straddles the Precambrian/Cambrian boundary.[1] Below the boundary its ichnofauna comprises subhorizontal Planolites burrows; above it, Phycodes burrows immediately appear, with Nemakit-Daldyn SSFs appearing soon after.[1] StratigraphyThe 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. [3]Depositional environmentThe 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.[4] PalaeontologyThe formation has yielded a range of SSFs including eggs and embryos, anabaritids, Protohertzina, Zhejiangorhabdion, and phosphatized tubes, spines and plates.[5] References1. ^1 2 {{Cite journal | doi = 10.1016/0301-9268(94)00073-Z| title = Neoproterozoic of the Mackenzie Mountains, northwestern Canada| journal = Precambrian Research| volume = 73| pages = 101| year = 1995| last1 = Narbonne | first1 = G. | last2 = Aitken | first2 = J. }} {{geology-stub}}2. ^{{cite journal|doi=10.1139/e89-011|pages=129–148|bibcode=1989CaJES..26..129B|title=Palynology of uppermost Proterozoic and lowermost Cambrian formations, central Mackenzie Mountains, northwestern Canada|journal=Canadian Journal of Earth Sciences|volume=26|year=1989|last1=Baudet|first1=D.|last2=Aitken|first2=J. D.|last3=Vanguestaine|first3=M.}} 3. ^{{Cite book|url=https://books.google.com/books?id=TGftJkWUs4oC&pg=PA1&dq=%22ingta%22+formation#v=onepage&q=%22ingta%22%20formation&f=false|title=Geological Survey of Canada, Current Research (Online) no. 2006-A4|isbn=978-0-662-43134-3|author1=Dewing|first1=K|last2=Sharp|first2=R J|last3=Ootes|first3=L|last4=Turner|first4=E C|last5=Gleeson|first5=S|year=2006}} 4. ^{{Cite journal | doi = 10.1046/j.1365-3091.1997.d01-41.x| title = Early Cambrian braid-delta deposits, Mac Kenzie Mountains, north-western Canada| journal = Sedimentology| volume = 44| issue = 4| pages = 587| year = 1997| last1 = MacNaughton | first1 = R. | last2 = Dalrymple | first2 = R. | last3 = Narbonne | first3 = G. U. Y. }} 5. ^{{Cite journal | doi = 10.1666/0022-3360(2006)80[811:ECMEEA]2.0.CO;2| title = Early Cambrian Metazoan Eggs, Embryos, and Phosphatic Microfossils from Northwestern Canada| journal = Journal of Paleontology| volume = 80| issue = 5| pages = 811| year = 2006| last1 = Pyle | first1 = L. J. | last2 = Narbonne | first2 = G. Y. M. | last3 = Nowlan | first3 = G. S. | last4 = Xiao | first4 = S. | last5 = James | first5 = N. P. }} 1 : Cambrian System of North America |
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