Category:Bass Limestone

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English: The lowermost member, en:Bass Formation, (also Bass Limestone-(formerly), of the en:Unkar Group.
  • It is found in northeast Grand Canyon; also center (east) associated with Granite Gorge.
  • Members of 5-unit Unkar Group:
    5--en:Cardenas Lava-(cliff-former, "mountain islands"-(en:manadnock), Tapeats Sea)
    4--Dox Formation-slopes
    3--Shinumo Quartzite-(cliff-former, "mountain islands"-(en:manadnock), Tapeats Sea)
    2--en:Hakatai Shale-slopes
    1--en:Bass Formation-slopes
  • Multi-colored slopes are created, for example at Isis Temple (Bright Angel Canyon region), and also contain debris from the Shinumo cliffs, or other geologic units above.