Marker Logo HMdb.org THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Trona in San Bernardino County, California — The American West (Pacific Coastal)
 

Welcome to the Trona Pinnacles

... a National Natural Landmark

 
 
Trona Pinnacles Marker image. Click for full size.
By Michael Kindig, December 4, 2011
1. Trona Pinnacles Marker
Inscription. Rising from the bottom of what was once an ancient lakebed, the Trona Pinnacles represent one of the most unique geologic landscapes in the California Desert. Over 500 of these tufa or calcium carbonate spires are spread out over a 14 square mile area across the Searles Lake basin. These features range in size from small coral-like boulders to several that top out at over 140 feet tall.

The Pinnacles were formed between 10,000 and 100,000 years ago when Searles Lake formed a link in a chain of interconnected lakes flowing from the Owens Valley to Death Valley. At one point during the Pleistocene, the spot where you are standing now was under 640 feet of water.

The Trona Pinnacles were designated as a National Natural Landmark by the U.S. Department of the Interior in 1968 to preserve one of North America's most outstanding examples of tufa tower formation.
 
Erected 2000 by U.S. Department of the Interior.
 
Marker series. This marker is included in the National Natural Landmarks marker series.
 
Location. 35° 37.007′ N, 117° 22.367′ W. Marker is in Trona, California, in San Bernardino County. Touch for map. Access to the site is from a BLM dirt road (RM143) that leaves
Welcome to the Trona Pinnacles Marker image. Click for full size.
By Michael Kindig, December 4, 2011
2. Welcome to the Trona Pinnacles Marker
State Highway 178, about 7.7 miles (12 km) east of the intersection of State Highway 178 and the Trona-Red Mountain Road. The 5.0-mile (8 km) long dirt road from State Highway 178 to the Pinnacles is usually accessible to 2-wheel drive vehicles, however, the road may be closed during the winter months after a heavy rain. Marker is in this post office area: Trona CA 93562, United States of America.
 
Other nearby markers. At least 4 other markers are within 10 miles of this marker, measured as the crow flies. John & Dennis Searles Wagon Routes (approx. 4.6 miles away); Epsom Salts Monorail (approx. 4.6 miles away); Searles Lake Borax Discovery (approx. 9.7 miles away); Austin Hall (approx. 9.9 miles away).
 
Also see . . .  Trona Pinnacles. The BLM website for the Trona Pinnacles. (Submitted on December 9, 2011.) 
 
Categories. Natural FeaturesNatural Resources
 
Trona Pinnacles image. Click for full size.
By Michael Kindig, December 4, 2011
3. Trona Pinnacles
Trona Pinnacles is a relict landform from the Pleistocene containing unique formations of calcium carbonate known as "tufa".
Registered Natural Landmark Marker image. Click for full size.
By Michael Kindig, December 4, 2011
4. Registered Natural Landmark Marker
Registered Natural Landmark Marker image. Click for full size.
By Michael Kindig, December 4, 2011
5. Registered Natural Landmark Marker
Trona Pinnacles has been designated a Registered Natural Landmark under the provisions of the Historic Sites Act of August 31, 1955. This site possesses exceptional value in illustrating the natural history of the United States.
 
 
Credits. This page was last revised on June 16, 2016. This page originally submitted on December 6, 2011, by Michael Kindig of Long Beach, California. This page has been viewed 574 times since then and 29 times this year. Photos:   1, 2. submitted on December 7, 2011, by Michael Kindig of Long Beach, California.   3, 4, 5. submitted on December 6, 2011, by Michael Kindig of Long Beach, California. • Syd Whittle was the editor who published this page.
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