Talk:Geology of the Grand Canyon area

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	Geology of the Grand Canyon area is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Wikipedia community. If you can update or improve it, please do.
	This article appeared on Wikipedia's Main Page as Today's featured article on November 2, 2005.
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Hi Mav, re the centre/right thing, I disagree, but not enough to want to argue about it - if we are going to center it, why don't we go the whole way and make it as wide as we can? I know, I know, but the Grand Canyon is perhaps the only page that would really justify this kind of treatment! Mark Richards 20:12, 28 Apr 2004 (UTC)

We are limited by what people with 800x600 screens can see. --mav

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I removed this from the Grand Canyon page - I think its all covered here. Wow - there is SO much work to do on this still! Let's go! Mark Richards 19:34, 28 Apr 2004 (UTC)

The strata, from the bottom to top, are:

   * Early Proterozoic Schist and Granite: 1.7 billion years ago
         o Vishnu Schist 
   * The Earlier Unconformity: 1.7 to 1.25 billion years ago
   * The Middle and Late Proterozoic Grand Canyon Supergroup: 1250 to 820 million years ago
         o The Uncar Group
         o Bass Limestone
         o Hotauta Conglomerate
         o Hakatai Shale
         o Shinumo Quartzite
         o Dox Sandstone
         o Cardena Lavas 
   * Nakoweap Formation: 1 billion years ago
   * The Chuar Group: 950 million years ago
   * The Sixtymile Formation: 820 million years ago
   * The Great Unconformity: 820 to 570 million years ago
   * Paleozoic Sediments: 570 to 245 million years ago
   * The Cambrian Tonto Group: 570 to 505 million years ago
   * A Pre-Devonian Unconformity: 505 to 360 million years ago
   * Devonian Deposits: 408 to 360 million years ago
         o Devonian River Channels
         o Temple Butte Formation 
   * The Redwall Limestone: 360 to 320 million years ago
         o Surprise Canyon Formation 
   * The Supai Group: 320 to 286 million years ago
         o Watahomigi
         o Manakacha
         o Wescogame
         o Esplanade 
   * The Hermit Shale: 286 to 245 million years ago
   * Coconino Sandstone
   * The Toroweap Formation
   * The Kaibab Formation
   * Mesozoic Geology: 245 to 66 million years ago
         o Shinarump Conglomerate
         o Moenkopi Formation
         o Chinle Shale
         o Chinle Formation
         o Moenave Formation
         o Kayenta Formation
         o Navajo Sandstone
         o Caramel Sandstones
         o Entrada Sandstones
         o San Rafael Group
         o Dakota Sandstone

Yep - still a lot to do. --mav

[edit] Invisible references

Invisible references via the Inote template (see talk page) are now implemented in this article. Your comments appreciated. Mozzerati 21:44, 2005 Apr 20 (UTC)

[edit] Should there be any talk about the current controvery over the grand canyon's age?

These articles suggest that there may be some controversy in the government's stance on the geological age of the grand canyon.

[1] [2] —The preceding unsigned comment was added by Chrisdab (talk • contribs) 22:23, 6 January 2007 (UTC).

See the discussion at Talk:Grand_Canyon. The fact that the government may choose to ignore science does not mean that the age of the Grand Canyon is controversial. Geologyguy 22:37, 6 January 2007 (UTC)