Geology Grand Canyon Supergroup

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three sections of grand canyon geology


the units of grand canyon supergroup (1250 ma 700 ma):



4--sixtymile formation (ends @ ~700 ma)
3--chuar group

[b]-kwagunt formation
[a]-galeros formation


2--nankoweap formation
1--unkar group

(5)--cardenas basalt, youngest, meso-proterozoic 1070 ± 70 million years
(4)--dox formation
(3)--shinumo quartzite
(2b)--diabase sills-(4 sills, 25 ft thickness max; sources of cardenas basalt)
(2)--hakatai shale
(1)--bass formation, (begins @ ~1250 ma)









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