Volcanic Origins -- Window Trail, Big Bend NP TX - Places of Geologic Significance on Waymarking.com

From this spot on the Window Loop Trail in the Chisos Basin, you can see many of the most prominent peaks of the Chisos. A sign along the Window Loop Trail tells of the violent volcanic eruptions that formed these amazing landforms as follows:

"VOLCANIC ORIGINS
Volcanic eruptions between 17 million and 38 million years ago formed the Chisos Mountains. Geologists believe that some mountain peaks, including Emory Peak and Casa Grande may have been volcanic vents that spewed gases, rocks, ash, and lava in violent erections. In other areas thick lava oozed up slowly through huge fissures and hardened into enormous rounded mounds known as lava domes. Following the volcanic activity, millions of years of erosion war down these mountains and partially filled the basin with sediments. Now the sediments are being railroaded and carried out of the Basin through the Window.

[photo]
Volcanic activity similar to that of Mount Saint Helens formed the Chisos Mountains.

The peaks around the basin consist mostly of rhyolite, and igneous rock rich in quartz.

Casa Grande
Toll Mountain
Emory Peak
Ward Mountain
Window
Vernon Bailey Peak"

Waymark is confirmed to be publicly accessible: yes Access fee (In local currency): 25.00 Requires a high clearance vehicle to visit.: no Requires 4x4 vehicle to visit.: no Public Transport available: no Website reference: [Web Link] Parking Coordinates: Not Listed

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Date Logged Log User Rating   12/25/2016 Benchmark Blasterz visited it