Category:Hakatai Shale

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English: The Hakatai Shale, above the lowest Bass Limestone member, Unkar Group, of the Grand Canyon Supergroup. Part of the oldest geologic units in the Grand Canyon, Arizona, USA.

Unkar Group members:

6--Cardenas Lava, (Cardenas Lavas)-(erosion resistant, island: Tapeats Sandstone-(of Tapeats Sea), only deposited horizontally on "mountain island"-perimeter
5--Dox Formation
4--Shinumo Quartzite-(erosion resistant, island: Tapeats Sandstone-(of Tapeats Sea), only deposited horizontally on "mountain island"-perimeter
3--Diabase Sill
2--Hakatai Shale
1--Bass Limestone, (on Vishnu Schist)