File:Grand Canyon Supergroup showing Cardenas Lava.JPG
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English: (See file name).
(Photo: "Basalt Creek delta, on Colorado River, near the start of the basement rocks in Grand Canyon." (the start is just upstream) The horizontal cliff at top of the 15 degree, angular unconformity, is the en:Tapeats Sandstone. 4 Horizontally laid (deposited) layers are shown in this photo below the en:Tapeats Sandstone. The top layer is at photo top-right. The first 2 layers are in Grand Canyon Supergroup-(of 4 units). (#3 of 4)-Chuar Group, (#2 of 4)-Nankoweap Formation, (3 and 4, are layers No. 5/6 of the en:Unkar Group)-(unit #1 of 4 in the Supergroup(Unkar Group), (unit 6 of 6)- en:Cardenas Lava, (unit 5 of 6)-Dox Formation. The 4-layers are conformablly laid, no timegaps. The contact above the Sixty Mile Formation (unit 4 of 4)/Chuar Group is a en:fault (geology) with Vishnu Schist, mostly found later downstream, (another fault), in the Granite Gorge-(but with the bottom units of the series, (the lowest of Unkar Group, unit 1 of 6)). Note: Basalt Creek delta, is in the Dox Formation, the cliffs directly up creekside, go into the overlying Cardenas Lava, maybe 40-80 ft(?) thick, at creekside, but the Cardenas Lava in places is up to 800 ft thick. |
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| Source | http://www.nature.nps.gov/geology/parks/grca/age/index.cfm |
| Author | National Park Service |
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See 206.02(b) of Compendium II: Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use. |
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