File:NASA SP-56 Microfossils from Precambrian chert 1.jpg
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![File:NASA SP-56 Microfossils from Precambrian chert 1.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/5/56/NASA_SP-56_Microfossils_from_Precambrian_chert_1.jpg/512px-NASA_SP-56_Microfossils_from_Precambrian_chert_1.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:33, 11 January 2024 | ![]() | 1,750 × 2,050 (1.54 MB) | EncycloPetey | == {{int:filedesc}} == {{Artwork |Description={{en|1=Representative microfossils, preserved in chert from the Gunflint iron-formation of the north shore of Lake Superior. This formation is of middle Precambrian age and has been dated by K40 -Ar40 as approximately 2 × 106 years. All figures are from thin sections of the chart photographed in transmitted light. Published here for the first time (from Dr. E. S. Barghoorn); NASA Special Publications 56; Fig 1 (left half), page 2.}} |Source={{extr... |
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