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Perris Block

Geography of Riverside County, CaliforniaGeography of San Bernardino County, CaliforniaGeology of Los Angeles County, CaliforniaGeology of Riverside County, CaliforniaGeology of San Bernardino County, California
Inland EmpirePeninsular Ranges

The Perris Block is the central block of three major fault-bounded blocks of the northern part of the Peninsular Ranges. The Perris Block lies between the Santa Ana Block to the west and the San Jacinto Block to the east. The Perris Block, was named by Walter A. English in 1925 for the city of Perris, located near the center of the block.Structurally stable for millions of years, the Perris Block is an internally unfaulted, eroded mass of Cretaceous and older granitic rocks of the Southern California Batholith and metasedimentary basement rocks. These rocks compose various ranges of mountains and hills and monadnocks and underlie the valleys within it. It is bounded on the west by the Chino Fault and Elsinore Trough, on the east and northeast by the San Jacinto Fault Zone including the San Jacinto Valley graben. It is bounded on the north by the Cucamonga Fault Zone, in the San Bernardino Valley and San Jose Hills Fault in the Pomona Valley. To the south, the Perris Block is bounded by the San Felipe Fault Zone between it and the Temecula, Aguanga, and Anza sedimentary basins that lie between Temecula and Anza. The interior of the Perris Block has various low bedrock mountains, hills and bedrock plains with intervening sediment-filled valleys, that make up six erosional surfaces sculpted by the effects of the vertical oscillation of the block during the Plio - Pleistocene era.

Excerpt from the Wikipedia article Perris Block (License: CC BY-SA 3.0, Authors).

Geographical coordinates (GPS)

Latitude Longitude
N 33.8525 ° E -117.25527777778 °
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I 215
92518
California, United States
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Camp Haan
Camp Haan

Camp Haan was a US Army training camp built in 1940, near March Air Force Base in Riverside County, California Camp Haan was opened in January 1941 as a training camp for Coast Artillery Antiaircraft gunners. The 8,058 acres camp was about four miles by three miles with tent housing. The camp was named after Major General William George Haan of World War I. By the end of 1941, the camp had a wood service building, 28 miles of streets, five chapels, and a hospital. The first troops trained were sent for the defense of Los Angeles and San Francisco. The Attack on Pearl Harbor and the Battle of Los Angeles–Bombardment of Ellwood had put all of California on high alert. The Army Service Depot was added to the camp in March 1942. The site of the former Camp Haan is next to California Interstate 215 at the Van Buren Boulevard exit. Jack Benny performed his radio show live at the camp on April 12, 1942.The winning of the North African campaign brought a number of Italian Prisoners of War (POW) to California. A POW camp was built in September 1942. It held 1,200 Italian prisoners. The Italian Service Unit of 3rd Italian Quartermaster Service Company worked at the camp. In April 1945, German POWs arrived at the camp. A US Army correctional center was also built at the camp. As wounded arrived from the Pacific War, an 800-bed Army hospital was built at the camp. Camp Haan at its peak had 80,000 troops, POWs, inmates, and hospital personnel. At the end of the war, the camp was used for temporary housing of troop coming from Operation Magic Carpet. Camp Haan was closed on August 31, 1946. The land was given back to March Air Base. In 1976, part of the former camp was used for the 921 acre Riverside National Cemetery. The site now houses the Riverside National Cemetery and the General Old Golf Course near Riverside, Riverside County, California. The site of the camp is across I-215 from March Air Reserve Base. The other part of the land became part of Arnold Heights houses. Arnold Heights is named after Army General Henry Harley "Hap" Arnold. In 2023, a book titled "Camp Haan: Riverside's World War II Anti Aircraft Training Center" was released by Keith A. Beaulieu. The book provides a comprehensive historical perspective of the camp and people. It is available on Amazon.