San Joaquin Mountain is a mountain along the

Sierra Crest The Sierra Crest is a roughly generally north-to-south ridgeline that demarcates the broad west and narrow east slopes of the Sierra Nevada and that extends as far east as the Sierra's topographic front (e.g., Diamond Mountains and Sierran esc ...

, near

June Lake, California June Lake is an unincorporated community and census-designated place (CDP) in Mono County, California, Mono County, California, United States. It is located against the southern rim of the Mono Basin, south of Lee Vining, California, Lee Vining, ...

. It is the twenty-sixth highest peak in California, and is the highest peak along the Sierra Crest for . The mountain is formed of

quartz latite A quartz latite is a volcanic rock or fine grained extrusive rock composed mostly of alkali feldspar and plagioclase with some quartz. It forms from the rapid cooling of magma of intermediate composition but moderately enriched in alkali metal ox ...

that erupted during the

Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58Minaret Summit Minaret Summit is a mountain pass on Highway 203 in the central Sierra Nevada. The pass, lying on the Madera-Mono County border, is within the Mammoth Ranger District of the Inyo National Forest and located near Devils Postpile National Monumen ...

References

Mountains of the Sierra Nevada (United States) {{MaderaCountyCA-geo-stub