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Natural Arch -- Grapevine Hills Trail, Big Bend NP TX
Posted by: Groundspeak Premium Member Benchmark Blasterz
N 29° 23.991 W 103° 12.125
13R E 674452 N 3253631
Quick Description: A small natural arch on the Grapevine Hills Trail in Big Bend National Park
Location: Texas, United States
Date Posted: 1/30/2017 9:31:36 AM
Waymark Code: WMTZZK
Published By: Groundspeak Premium Member bluesnote
Views: 1

Long Description:
This small natural arch is located high up the cliffs at the spot where the Balanced Rock trail splits off from the Grapevine Hills Trail in Big Bend National Park.

This arch looks like it is made of sandstone, or a sedimentary layer of ash or sea floor that overload the magma dome that one day 38 million years ago rose up and fractured this area in to boulders.

A sign at the Grapevine Hills Trail (from which the Balanced Rock trail branches) reads as follows:


The easy 2 mile round-trip trail follows a sandy wash through the jumble of boulders. After reaching a low pass, find a “window” of boulders by hiking another hundred yards along the ridge to the right.

This trail enters a realm of petrified fire. Here, under enormous pressure, a molten rock ballooned up beneath the earth surface. As erosion stripped away overlying layers the exposed domes fractured into a moonscape of giant boulders.

Grapevine Hills is a laccolith - a mushroom shaped intrusion of magma.

As the laccolith slowly cooled and hardened into granite, the overlying sedimentary layers began to wear away."
Photo of the Arch by itself?: yes

Type of Arch: Water Eroded

Type of Material:
sedimentary rock softer than the volcanic granite of the lava dome

Visit Instructions:
You must post a picture of you with a GPSr or Geocaching/Waymarking attire/equipment and the subject arch in the background.
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Recent Visits/Logs:
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wb96bobwhite visited Natural Arch -- Grapevine Hills Trail, Big Bend NP TX 3/14/2017 wb96bobwhite visited it
Benchmark Blasterz visited Natural Arch -- Grapevine Hills Trail, Big Bend NP TX 12/25/2016 Benchmark Blasterz visited it

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