What Type of Rock Is Most Common in the Canyon and How Old Are the Oldest Rock Layers in the Canyon?

Answer

The most common type of rock in the Grand Canyon is sedimentary rock. This is the oldest layer and is over 25 million years old. The top layer is composed mostly of Kalibab Limestone and is less than 25 million years old.
Q&A Related to "What Type of Rock Is Most Common in the Canyon..."
the bottom one.
http://wiki.answers.com/Q/Which_grand_canyon_rock_...
A. Source(s) http://seis.natsci.csulb.edu/bperry/Sedi….
http://answers.yahoo.com/question/index?qid=200804...
Sedimentary.
http://wiki.answers.com/Q/What_type_of_rock_forms_...
its is made up of Kaibab limestone, Toroweap formation, Coconino sandstone, Hermit shale, Supai group, redwell limestone, Mauv limestone, bright angel shale, Tapeats sandstone, and
http://wiki.answers.com/Q/What_types_of_rocks_make...
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