Talk: Geology of the Grand Canyon area

From open-encyclopedia.com - the free encyclopedia.

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)

---

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