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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Near Alpine in Brewster County, Texas — The American South (West South Central)
 

Ancient Rocks Boundary

 
 
Ancient Rocks Boundary Marker image. Click for full size.
By Richard Denney, December 22, 2009
1. Ancient Rocks Boundary Marker
Inscription. The mountains toward the east are limestone reef beds deposited in the Cretaceous and Permian seas about 135 million years ago and 250 million years ago; respectively. The limestone reefs overlie deformed rocks in the Ouachita Fold Belt, which is visible along the highway to the east, near Marathon. To the south are younger limestone beds deposited about 125 to 135 million year ago. They also rest above the Ouachita Fold Belt (so named for the Ouachita Mountains of Arkansas-Oklahoma, where formation was first studied by geologists).Toward the west, northwest, and southwest are layers of lava and associated volcanic rocks 25 to 35 million years old. These were thrust upward, into and over most of the older sedimentary rock layers. Many of the molten rock masses cooled and hardened underneath, while vast quantities poured over the surface in the form of lava flows and volcanic debris up to a mile in thickness. Subsequent erosion has sculptured these highlands by removing much of the younger volcanic rock, and cutting deeply into the older sea deposits. Out of the lower, igneous hills grow yucca and other cacti, contrasting with juniper and pinon on the higher elevations.
 
Erected 1970 by State Historical Survey Committee. (Marker Number 157.)
 
Location.
Ancient Rocks Boundary Marker image. Click for full size.
By Zacharias Beau T, circa December 10, 2012
2. Ancient Rocks Boundary Marker
Glass Mountains, 6,531 ft. above sea-level with yucca stalks and spears at roadside park and markers.
30° 22.525′ N, 103° 32.007′ W. Marker is near Alpine, Texas, in Brewster County. Marker is at the intersection of U.S. 90 and U.S. 67, on the right when traveling west on U.S. 90. Click for map. Marker is in this post office area: Marathon TX 79842, United States of America.
 
Other nearby markers. At least 8 other markers are within 8 miles of this marker, measured as the crow flies. Brewster County (within shouting distance of this marker); Lawrence Sullivan Ross (approx. 7.1 miles away); Burgess' Water Hole (approx. 7.5 miles away); Nolte-Rooney House (approx. 7.6 miles away); Gage-Van Sickle (approx. 7.6 miles away); First Baptist Church of Alpine (approx. 7.7 miles away); Ritchey Hotel (approx. 7.7 miles away); Our Lady of Peace Catholic Church (approx. 7.7 miles away). Click for a list of all markers in Alpine.
 
Categories. Natural Features
 
Looking northwest towards Alpine image. Click for full size.
By Richard Denney, December 22, 2009
3. Looking northwest towards Alpine
Marker is visible to right.
View across road from marker image. Click for full size.
By Richard Denney, December 22, 2009
4. View across road from marker
Ouachita Fold Belt image. Click for full size.
By Bill Kirchner, October 24, 2012
5. Ouachita Fold Belt
Brewster County Marker image. Click for full size.
By Richard Denney, December 22, 2009
6. Brewster County Marker
This marker is co-located at this site, and is also visible in photo above, looking west to Alpine.
 
 
Credits. This page originally submitted on , by Richard Denney of Austin, Texas. This page has been viewed 749 times since then and 7 times this year. Photos:   1. submitted on , by Richard Denney of Austin, Texas.   2. submitted on , by Zacharias Beau T of Alpine, Texas.   3, 4. submitted on , by Richard Denney of Austin, Texas.   5. submitted on , by Bill Kirchner of Tucson, Arizona.   6. submitted on , by Richard Denney of Austin, Texas. • Bill Pfingsten was the editor who published this page. This page was last revised on June 16, 2016.
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