Saltdale – Koehn Dry Lake

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Koehn Lake and the nearby ghost town of Saltdale have a rich history intertwined with the salt industry in California. Koehn Lake, situated in the Fremont Valley of the Mojave Desert in eastern Kern County, California, is a dry and seasonally endorheic lake, occasionally becoming a closed basin without outflow. The lake is approximately 5 miles long and 3 miles wide at its widest point.

Saltdale, founded in 1915, owes its origins to the salt harvesting operations from Koehn Dry Lake. The town had a post office operating from 1916 to 1950. The history of salt production in the area began in earnest in 1914 with the operations of the Consolidated Salt Company. This was further expanded with the involvement of the Fremont Salt Company from 1919 to 1927, which also utilized solar evaporation of surface brine for salt production.

The salt industry in this region has undergone several changes in ownership and production methods over the years. In the early 20th century, salt production fluctuated considerably, largely dependent on rainfall and storm runoff to supply water for brine formation. Modern techniques involve pumping brine from wells and channeling it to ponds for evaporation, a process that takes about four months to form approximately 6 inches of salt.

Saltdale, during its peak, had a diverse community, including managers, skilled workers, and their families, as well as common laborers, often Latino Catholics. The town had facilities like a company store, a post office, a school, and a service station. Saltdale’s school, under the guidance of notable teachers, played a significant role in community life, including efforts towards “Americanization” by encouraging English language use and cultural integration.

However, Saltdale faced challenges due to its remote location and the fluctuations in the salt industry. The town experienced isolation, difficulties in accessing law enforcement and medical care, and was impacted by the economic conditions of the time, including the Great Depression.

The decline of Saltdale was marked by the eventual abandonment of the town by the 1970s. The salt operations also evolved, with less need for manpower due to modernization. Today, Saltdale stands as a ghost town, with the remnants of its past slowly eroding away in the salty landscape.

Koehn Lake, apart from its salt mining history, has also been used for various other purposes. At its northern end, there are evaporation ponds from the salt mining operation, and the rail siding at the former townsite of Saltdale has been used for offloading explosives. The area around the lake has also been used for testing by the Reaction Research Society and for a desert test track by Honda Motors. In 2014, it was notably the area where Virgin Galactic’s experimental spaceship disintegrated.

The history of Koehn Lake and Saltdale provides a unique glimpse into the industrial and community life of early 20th-century California, highlighting the challenges and adaptations of a community built around a natural resource.


Rainbow Basin Geology

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Rainbow Basin

Rainbow Basin is a geological formation in the Mojave Desert of California. It is known for its unique and colorful rock formations, which provide valuable insights into the region’s geological history. Here are some key aspects of the geology of Rainbow Basin:

  1. Sedimentary Rocks: Rainbow Basin primarily comprises sedimentary rocks accumulated over millions of years. These rocks include sandstones, shales, and mudstones. The different layers of sedimentary rocks represent different periods of geological history.
  2. Fossilized Marine Life: Within the sedimentary rocks of Rainbow Basin, fossils of marine life from the Miocene epoch (approximately 15-20 million years ago) have been found. These fossils include shells, bones, and other remnants of ancient sea creatures. This suggests that a shallow sea once covered the area.
  3. Faulting and Uplift: The geology of Rainbow Basin has been influenced by tectonic forces. The region is situated near the intersection of several fault lines, including the Garlock Fault. These fault movements have caused the uplift of the rocks, exposing them to erosion and creating the unique landscape seen today.
  4. Erosion and Weathering: Over time, erosion and weathering have shaped the colorful rock formations in Rainbow Basin. These processes have created intricate patterns and exposed layers of colored sediments, giving the area its name.
  5. Geological Time Scale: The rocks at Rainbow Basin span a significant portion of the geological time scale, providing geologists with valuable information about the changing environments and life forms that existed in the area millions of years ago.
  6. Geological Tours: Rainbow Basin is a popular destination for geological enthusiasts and tourists interested in its unique geology. There are guided tours and interpretive exhibits that provide insights into the geological history of the area.
Rainbow Basin photo
Rainbow Basin, Barstow, Ca.

In summary, Rainbow Basin is a geological wonder in the Mojave Desert, characterized by its sedimentary rocks, fossils, faulting, erosion, and vibrant colors. It offers a glimpse into the geological history of California and the forces that have shaped its landscape over millions of years.

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Goldstone Index

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Gold Stone is the name of a new camp, thirty-five miles north of Barstow, where some phenomenal ore has been found. Quite a stampede followed the discovery.

MINING IN NORTHWEST SAN BERNARDINO COUNTY

The area is the site of the only commercial opal mine in the California Desert. Waterman. Five years before the famous silver discoveries at Calico, George G.

Barstow Index – Notes

4 days ago  Post Views: 12. Goldstone, Barstow California, Mojave Desert. digital-desert.com › goldstone-ghost-town. Goldstone Ghost Town. More of a site …

Harper Dry Lake – Hinkley California, Barstow region

Goldstone – Mojave Desert. Several people were involved in mining during this same time, including John Harper and Goodrich. 289. One of the most active …

Mojave Desert Ghost Towns

… Goldstone — Goldstone* — Gold Valley* — Goler Gulch — Goodsprings, Nevada — Greenwater — Greenwater* · Harrisburg — Hart · Ibex — Ivanpah · Johannesburg

Timeline / Chronology of Mojave Desert Mining History

Persistent rumors have it that gold … 1859: Bodie, California … by prospector Wakeman S. Bodey, who the town was named after. Bodey died in November making …

Notes

States: Primarily in California and Nevada, with smaller portions in Arizona and Utah. Extent: The Mojave Desert is part of the larger North American Desert and …

Mojave Valley – Granite Mountains: Mojave Desert Ecological …

digital-desert.com › ecosections

Some of the dry lake beds are Bicycle, Coyote, East Cronese, West Cronese, Goldstone, Langford Wells, Leach, Manix, Nelson, Pilot Knob Valley, Red Pass, and …

Romantic Heritage of the Mojave River Valley

And now, with the operations of the Goldstone tracking station ushering the “space age” into the desert, the future holds promise far beyond the wildest dreams …

Transverse Ranges

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The Transverse Ranges are a group of mountain ranges in Southern California, USA. They run east-west and are characterized by their unique orientation, perpendicular to the typical north-south alignment of most other mountain ranges in North America. The Transverse Ranges play a significant role in the geography and climate of Southern California.

San Gabriel Range
San Bernardino Range

The main Transverse Ranges include:

  1. San Gabriel Mountains: Located northeast of Los Angeles, the San Gabriel Mountains are a prominent part of the Transverse Ranges. They contain several peaks over 10,000 feet, including Mount San Antonio (Mt. Baldy), the highest peak in the range.
  2. San Bernardino Mountains: To the east of the San Gabriel Mountains, the San Bernardino Mountains are another subrange within the Transverse Ranges. They include prominent peaks such as San Gorgonio Mountain, the highest peak in Southern California.

Additional Transverse Ranges (not in project)

  1. Santa Ynez Mountains: Situated to the northwest of Los Angeles, the Santa Ynez Mountains are part of the Transverse Ranges and run parallel to the coast. They contribute to the scenic backdrop of the Santa Barbara area.
  2. Santa Susana Mountains: Located northwest of Los Angeles, the Santa Susana Mountains are a smaller subrange within the Transverse Ranges.
  3. Topatopa Mountains: Situated north of Ventura, the Topatopa Mountains are part of the Transverse Ranges and are known for their distinctive east-west orientation.

Rain Shadow Desert

The Transverse Ranges have a significant impact on the climate of Southern California. They act as a barrier to moist air coming from the Pacific Ocean, causing a rain shadow effect. This results in a drier climate on the leeward (eastern) side of the ranges, contributing to the arid conditions of the inland areas.

Earthquakes

San Juan Capistrano (Wrightwood) 

December 8, 1812 | M7.5

This midmorning earthquake occurred on December 8, 1812, with an estimated magnitude of 7.5 (Mw). The location is uncertain but probably on the San Andreas fault near Wrightwood in San Bernardino County.

This quake is remembered, and named after, its death toll: forty Native Americans attending mass at San Juan Capistrano were killed when the church collapsed due to the mortar in the walls failing. Records from this time are poor, but it is likely that there was also damage at Mission San Gabriel and in San Diego.

1857 Fort Tejon Earthquake

The Fort Tejon earthquake occurred on January 9, 1857, and is one of the largest historical earthquakes in California. It had an estimated magnitude of 7.9 and was associated with the southern segment of the San Andreas Fault

1952 Kern County Earthquake

The 1952 Kern County earthquake occurred in southern California on July 21, 1952. This earthquake had an estimated magnitude of 7.3, making it one of the most powerful earthquakes in California’s history. The epicenter was near the White Wolf Fault in the southern Sierra Nevada mountain range.

1872 Owens Valley Earthquake

The 1872 Owens Valley earthquake was a significant seismic event on March 26, 1872, in Owens Valley, California, USA. The earthquake is estimated to have had a magnitude of 7.4 to 7.9, making it one of the largest historical earthquakes in California.

Cajon Pass 

July 22, 1899 | M5.7

On July 22, 1899, a magnitude 5.7 (ML) earthquake occurred about 15 miles northwest of San Bernardino. People reported feeling this quake in much of Southern California. No deaths were reported, but the number of injuries is uncertain.

The earthquake caused landslides that blocked the Lytle Creek Canyon road and the road through Cajon Pass. It also caused some damage to buildings in San Bernardino, Highland and Patton. Minor damage was also reported in Redlands, Pomona, Riverside, Pasadena and Los Angeles.

Manix

April 10, 1947 | M6.5

On April 10, 1947, a magnitude 6.5 (Mw) earthquake occurred about 25 miles east of Barstow. Because of its remote location, it didn’t cause a lot of damage. However, there were reports of cracked floors and walls, a few collapsed structures, and heavy objects being moved.

This quake was notable because it was the largest earthquake at that time—and the first to cause surface rupture (about three miles of rupture)—in the Mojave Block tectonic region.

Big Bear Earthquake

TYPE OF FAULTING: left-lateral strike-slip
TIME: June 28, 1992 / 8:05:30 am PDT
LOCATION: 34° 12′ N, 116° 49.6′ W 8 km (5 miles) SE of Big Bear Lake 40 km (25 miles) east of San Bernardino
MAGNITUDE: MSS.4

DEPTH: 5 km

While technically an “aftershock” of the Landers earthquake (indeed, the largest aftershock), the Big Bear earthquake occurred over 40 km west of the Landers rupture, on a fault with a different orientation and sense of slip than those involved in the main shock — an orientation and slip which could be considered “conjugate” to the faults which slipped in the Landers rupture.

The Big Bear earthquake rupture did not break the surface; in fact, no surface trace of a fault with the proper orientation has been found in the area. However, the earthquake produced its own set of aftershocks, and from these, we know the fault geometry — left-lateral slip on a northeast-trending fault.

Following the Landers mainshock by three hours (it occurred while TV news coverage of the Landers earthquake was being broadcast live from Caltech), the Big Bear earthquake caused a substantial amount of damage in the Big Bear area, but fortunately claimed no lives. Landslides triggered by the jolt blocked roads in the San Bernardino Mountains, however, aggravating the clean-up and rebuilding process.

1952 Kern County Earthquake

The 1952 Kern County earthquake occurred on July 21, 1952, in southern California. This earthquake had an estimated magnitude of 7.3, making it one of the most powerful earthquakes in California’s history. The epicenter was near the White Wolf Fault in the southern Sierra Nevada mountain range.

Key points about the 1952 Kern County earthquake:

  1. Magnitude and Intensity: The earthquake was 7.3 and is considered a major event. It caused strong shaking in the affected areas.
  2. Location: The epicenter was near Arvin in Kern County, California.
  3. Damage: The earthquake caused significant damage in several communities, including Bakersfield, Tehachapi, and Arvin. Many buildings were damaged, and some were destroyed. Infrastructure, such as roads and bridges, also suffered.
  4. Casualties: The earthquake resulted in 12 fatalities and numerous injuries. The loss of life and property damage were considerable.
  5. Aftershocks: Like many major earthquakes, the 1952 Kern County earthquake was followed by a series of aftershocks, some of which were strong enough to cause additional damage.
  6. Effects on Oil Fields: The earthquake had notable effects on oil fields in the region. The shaking caused ground rupture and surface faulting, impacting oil extraction operations.
  7. Response and Study: The earthquake prompted increased interest and research in engineering and seismology. Lessons learned from the event contributed to advancements in earthquake-resistant building design and seismic hazard assessment.

The 1952 Kern County earthquake was a significant event in the history of seismic activity in California, and it played a role in shaping earthquake preparedness and research efforts in the region.

1872 Owens Valley Earthquake

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The 1872 Owens Valley earthquake was a significant seismic event on March 26, 1872, in Owens Valley, California, USA. The earthquake is estimated to have had a magnitude of 7.4 to 7.9, making it one of the largest historical earthquakes in California.

Some key points about the 1872 Owens Valley earthquake:

  1. Location: The earthquake’s epicenter was near Lone Pine in Owens Valley, in eastern California, near the eastern Sierra Nevada mountain range.
  2. Effects: The earthquake caused extensive damage in the Owens Valley region. The town of Lone Pine suffered the most severe damage, with many buildings collapsing. In addition to the structural damage, the earthquake triggered ground ruptures, creating surface faulting along the eastern Sierra Nevada.
  3. Surface Rupture: The earthquake is notable for the significant surface rupture that occurred along the Owens Valley fault. This rupture extended for about 30 miles (48 kilometers) and displaced the ground horizontally by as much as 15 feet (4.5 meters). This surface rupture remains visible today as a scar on the landscape.
  4. Aftershocks: Numerous aftershocks followed the mainshock, continuing for several months. These aftershocks contributed to ongoing damage and hampered recovery efforts.
  5. Impact on the Landscape: The earthquake caused changes to the landscape, including the formation of new fault scarps and the uplifting of land along the eastern Sierra Nevada. These changes are still studied by geologists today.
  6. Historical Significance: The 1872 Owens Valley earthquake is historically significant in the study of seismic activity in California. It provided valuable data for understanding the behavior of faults and the effects of large earthquakes on the landscape.

It’s worth noting that the Owens Valley region remains seismically active, and scientists continue studying the area to understand future earthquakes’ potential better. The 1872 event serves as a reminder of the seismic hazards associated with the complex fault systems in California.

Lone Pine

Owens Valley

Eastern Sierra Nevada

Mormon Rocks

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The Mormon Rocks, also known as the Rock Candy Mountains, are a series of distinctive sandstone outcrops in the Cajon Pass, a mountain pass in the San Bernardino Mountains of Southern California. The Cajon Pass is a critical transportation corridor connecting the Los Angeles Basin with the Mojave Desert and beyond.

Here are some key points about Mormon Rocks and their significance:

  1. Location: The Mormon Rocks are within the Cajon Pass, traversed by Interstate 15 and several major railroad lines. The rocks are easily visible from the highway, making them a notable geological feature.
  2. Geological Formation: The rocks are sedimentary sandstone and formed through tectonic and erosional processes over millions of years. The distinctive red and white banded appearance is due to iron oxide (hematite) and other minerals.
  3. Cultural Significance: The Mormon Rocks have cultural and historical significance. The area is named after a group of Mormon pioneers who passed through the Cajon Pass in the mid-19th century during their westward migration. The rocks are a prominent landmark in the pass and have been featured in various forms of media.
  4. Recreational Opportunities: The area around Mormon Rocks provides outdoor activities and recreation opportunities. There are trails and viewpoints where visitors can appreciate the geological formations and enjoy scenic views of the surrounding landscape.
  5. Conservation: The Mormon Rocks are part of the San Bernardino National Forest, and efforts are made to preserve and protect the natural and cultural resources in the area.
  6. Railroad Transportation: The Cajon Pass is a crucial route for road and rail traffic. The presence of the rocks adds to the landscape’s visual appeal and has made the pass a notable location for train enthusiasts who enjoy watching trains navigate the steep grades of the pass.

Whether you are interested in geology, history, or simply enjoying scenic landscapes, the Mormon Rocks in the Cajon Pass offer a unique and visually striking destination. If you plan to visit, be sure to follow any posted regulations and respect the natural environment.

Desert Rockhounding

Desert rockhounding is a popular recreational activity that involves searching for, collecting, and identifying rocks, minerals, gemstones, and fossils in arid regions. Deserts often have unique geological formations and a diverse range of minerals, making them interesting and rewarding for rockhounding enthusiasts. Here are some tips for desert rockhounding:

  1. Research the Area: Before heading out, research the desert area you plan to explore. Learn about the geology, rock formations, and the types of minerals or gemstones commonly found in that region. Geological maps and online resources can be valuable tools.
  2. Check Regulations: Be aware of any regulations or restrictions in the area you plan to visit. Some areas may have rules about collecting rocks, and respecting these regulations is important to preserve the environment.
  3. Safety First: Deserts can be challenging environments with extreme temperatures. Wear appropriate clothing, including a hat, sunscreen, and sturdy footwear. Carry plenty of water and be mindful of your surroundings to ensure a safe and enjoyable rockhounding experience.
  4. Use the Right Tools: Bring the necessary rock-hounding tools, such as rock hammers, chisels, safety glasses, gloves, and a backpack to carry your finds. A field guide to rocks and minerals can help you identify your discoveries.
  5. Explore Washes and Dry Creek Beds: Water action in desert washes can concentrate rocks and minerals, making these areas fruitful for rockhounding. Explore dry creek beds, washes, and areas where water has flowed in the past.
  6. Look for Indicator Minerals: Certain minerals may indicate the presence of valuable gemstones or other interesting specimens. Learn to recognize indicator minerals and follow their trail to potential collecting sites.
  7. Be Respectful: Leave no trace and practice ethical rockhounding. Avoid damaging plants, disturb the environment as little as possible, and fill in any holes you may dig. Remember that some areas may be protected, and it’s important to respect these conservation efforts.
  8. Join Rockhounding Clubs: Consider joining local rockhounding clubs or groups. These organizations often have experienced members who can share knowledge about the best collecting sites and provide guidance on responsible rockhounding practices.
  9. Time Your Visit: The best time for desert rockhounding is during the cooler months, as summer temperatures can be extremely high. Early morning and late afternoon are generally more comfortable and offer better lighting for observing and collecting.
  10. Learn to Identify Rocks: Familiarize yourself with the characteristics of rocks and minerals commonly found in the desert. Understanding the properties, colors, and formations of different specimens will enhance your rockhounding experience.

Always be aware of your impact on the environment and prioritize conservation while enjoying the excitement of discovering rocks and minerals in the desert.

Rockhound

Fort Tejon Earthquake 1857

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The Fort Tejon earthquake occurred on January 9, 1857, and is one of the largest historical earthquakes in California. It had an estimated magnitude of 7.9 and was associated with the southern segment of the San Andreas Fault. Here are some key details about the Fort Tejon earthquake:

  1. Date and Time:
    • The earthquake struck on January 9, 1857.
  2. Location:
    • The epicenter was near Fort Tejon in Kern County, California.
  3. Magnitude:
    • The earthquake is estimated to have had a magnitude of 7.9.
  4. San Andreas Fault:
    • The earthquake was associated with the southern segment of the San Andreas Fault.
  5. Damage:
    • The region affected by the earthquake was sparsely populated, which helped reduce casualties.
    • Significant damage occurred to buildings, infrastructure, and landscapes.
    • The earthquake caused surface rupture along the fault, creating a noticeable surface offset.
  6. Aftershocks:
    • A series of aftershocks followed the main event, further contributing to the seismic activity in the region.
  7. Impact on Landscape:
    • The earthquake caused visible changes in the landscape, with the ground surface breaking along the fault line.
  8. Historical Significance:
    • The Fort Tejon earthquake is significant in understanding the seismic history of California.
    • It provided valuable information about the behavior of the San Andreas Fault and the potential for large earthquakes in the region.

It’s worth noting that the Fort Tejon earthquake occurred when the population in the affected area was relatively low, which helped mitigate the impact on human lives. The earthquake remains an important event in studying California’s seismic activity and understanding earthquake hazards in the region.