Goat Mountain -- Big Bend NP TX
Posted by: Groundspeak Premium Member Benchmark Blasterz
N 29° 12.951 W 103° 22.132
13R E 658552 N 3233002
Quick Description: Much of Big Bend National Park was formed by the action of volcanoes, long since dormant. One of those old volcanoes created Goat Mountain
Location: Texas, United States
Date Posted: 1/28/2017 2:54:37 PM
Waymark Code: WMTZKQ
Published By: Groundspeak Premium Member NW_history_buff
Views: 3

Long Description:
Big Bend National Park is a geologist's dream -- or nightmare. There is so much to study here, where do you start?

Much of the park was covered many times with lava flows, and experiences cataclysmic eruptions and earthquakes. See: (visit link)

Goat Mountain is one of the famous mountains in the park, and was formed as a result of volcanic eruptions long ago.

Two signs along the Ross Maxwell Scenic Drive explain:

"GOAT MOUNTAIN

Some 29,000,000 years ago, volcanoes dominated the ancient Big Bend. Many of the formations along the Ross Maxwell scenic Drive, including Goat Mountain, originated in this volcanic past. A new theory (diagrams below) tells a tale of fiery explosions and massive volcanic domes.

[graphic]

An initial large explosion created a crater with an older, layered volcanic rock. Possibly the explosion occurred when rising magma (molten rock beneath the Earth’s crust) came into contact with water trapped in the older lava, causing it to flash into steam.

[graphic]
Silica rich magma continued searching upward, causing repeated pyroclastic eruptions (a mixture of superheated gas, ash, and rock fragments). The flows partially filled the crater, informed a collar of steaming volcanic material around the vents. Similar pyroclastic material is visible at Tuff Canyon and Burro Mesa Pouroff.

[graphic]
Over time, the gas content of the magma decreased, and the final eruptions produced thick slow, slow moving silica rich lava (magma that reaches the surface). The lava form thick domes that were higher than, and spread over, the crater walls. A dozen or so similar volcanic domes of dotted the landscape between Burro Mesa and Castolon.

[graphic]
About 27 million years ago, the region was uplifted and faulted and erosion began to shape the land we see today. The overlying silica rich lava was resistant to erosion and form steep, jointed cliffs. The weaker car pyroclastic deposits below or eroding away, exposing a dike (magma intrusion) that may represent part of the original magma feeder system."
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

Visit Instructions:
No specific requirements, just have fun visiting the waymark.
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Recent Visits/Logs:
Date Logged Log User Rating  
Benchmark Blasterz visited Goat Mountain -- Big Bend NP TX 12/24/2016 Benchmark Blasterz visited it