Found together with Megumi. What a nice canyon, what a nice bridge. I passed the tunnel barefoot, enjoying the feeling of the different rocks under my body. Thanks for bringing us here! TFTCM
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found "GC17V6P Tonto Natural Bridge"
The number of people in your group:
2
determine if the bridge is continuing to grow or be eroded away (N34 19.300 W111 27.340)
growing
Where do you think the growth or erosion is ocurring?
growth at the top, the bridge, erosion at the bottom in the valley.
A comparison between the travertine and the rhyolite beneath the bridge
the traverine is of very white color, looks like hanging bones - or some stalacmites grown at the bottom. rhyolite is more reddish and colorful. also the surface is different: travertine polishes like marble when people walk on it, rhyolite keeps some roughness.
Where can one find the basalt?
there are black basalt rocks upstream in the riverbed, between mostly reddish conglomerate.
oh yes, the bridge also grows a little sideways on the walls, and some stalacmites. most grow seems to expand the bridge even further