Jan 30, 2021
Lava Falls Overlook by James Marvin Phelps Via Flickr: Lava Falls Overlook Toroweap Grand Canyon National Park Arizona
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Lava Falls Overlook by James Marvin Phelps Via Flickr: Lava Falls Overlook Toroweap Grand Canyon National Park Arizona
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Brewing Storm... Toroweap, Grand Canyon National Park, Arizona
Grand Canyon, Arizona - by Matt Payne
The Toroweap formation; an interlude
On top of the stark white cliffs of the Coconino Sandstone there is a more gentle sloping set of beds, where trees and bushes often take root.
At its thickest the Toroweap formation is about 100 meters and it truly is a great example of being “in-between”. At the peak of Pangea’s formation, the seas retreated and the continent dried, forming the giant deserts that are represented by the Coconino Sandstone. After some of the main pulses of mountain-building, the plates on Earth began to reorganize and sea levels again began to rise. The Toroweap formation is a mixture of rock types produced as a consequence of this sea level change. There are sandy layers, layers containing gypsum, shaley layers, and even limestones. This sequence suggests a time when sea levels were rising but occasionally stalling and retreating. The shales and limestones were deposited when sea levels were higher, the sandstones were deposited when they retreated, and salts like gypsum are deposited when ocean water dries up.
The shale layers will erode more easily than the limestones or sandstones, creating patterns of resistant and recessive layers as shown well in this photo.
The Toroweap is about 270-260 million years old, similar in age to the Coconino Sandstone below, so there was likely only a small time interval between the units with limited erosion happening.
-JBB
Image credits: https://www.flickr.com/photos/jsjgeology/8412989402 https://www.flickr.com/photos/grand_canyon_nps/7706161852
Read more: http://3dparks.wr.usgs.gov/coloradoplateau/lexicon/toroweap.htm http://www.grandcanyonnaturalhistory.com/pages_nature/geology/2-toroweap.html http://www.bobspixels.com/kaibab.org/geology/gc_layer.htm#cs
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Looking up, looking down… by DaniloFaria
@kerrieneet - At #toroweap ⛺️ #grandcanyon in our #fourwheelcampers #roomwithaview #homeiswhereyouparkit
#Toroweap overlook - a 3,500 food drop off down to the #ColoradoRiver! It’s a great place to dangle your feet off a cliff on a natural bench! Can’t be afraid of nights though! Follow @NateArizona for more! ►◄►◄►◄►◄►◄►◄►◄►◄►◄►◄► ◄►◄►◄►◄►◄►◄►◄►◄► #grandcanyon #arizonagram #arizonalife #grandcanyonstate #grandcanyonnp #grandcanyontrip #northrim #toroweapoverlook (at Toroweap Overlook)