The Murrieta Hogbacks are Miocene basalt capped granitic hogbacks located in northeastern Murrieta on the southern end of the Temescal Mountains of Riverside County, California.

Murrieta Hogbacks
Murrieta Hogbacks (right) in June 2018
Highest point
Elevation	1,781 ft (543 m)[1]
Prominence	341 ft (104 m)[2]
Coordinates	33°35′09″N 117°09′14″W[1]
Geography
Murrieta Hogbacks Location in California
Location	Riverside County, California, U.S.
Parent range	Temescal Mountains
Topo map	USGS Murrieta, CA [1]
Geology
Age of rock	Cretaceous, Miocene
Mountain type	Granitic, Basalt

Geology

The Murrieta Hogbacks are underlain by Cretaceous granitic rocks of the Peninsular Ranges Batholith. On the north half of the hogbacks, by foliated biotite-hornblende tonalite and on the southern half by hornblende gabbro. The basalt is potassium-argon dated to 10.4 to 10.8 million years and is a remnant of a channel-filling basalt flow, overlying a thin deposit of unconsolidated gray stream gravel, indicating that the basalt had filled in a former water course.[3]

References

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