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Amador Co., California, USA

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Geological Overview Of Amador County
Amador County lies almost entirely in the Sierra Nevada geomorphic province; only the extreme western portion lies in the Great Valley. From the Great Valley eastward, the range gradually rises to the glaciated crest in the vicinity of Mokelumne and Thimble Peaks, both of which lie above 9000 feet.

The older rocks of the Sierra Nevada, commonly called the Bedrock series, consist of isoclinally folded, complexly faulted metamorphic rocks of Paleozoic and Mesozoic ages, intruded by several types of igneous rocks, chiefly granitic. Unconformably overlying these rocks in the western portion of Amador County are much younger, nearly flat-lying Tertiary sediments. These nearly flat-lying sediments are commonly called the Superjacent series.

In Amador County, the older metamorphic rocks are divided into the Calaveras and Amador (Taliaferro, 1943, pp. 282-284) groups and the Mariposa formation. The Calaveras group includes all of the pre-Mesozoic rocks in this county while the Amador group and Mariposa formation are Jurassic. Taliaferro has divided the Amador group of Amador County into two distinctive formations: the Cosumnes and Logtown Ridge formations.

Mineral List

Mineral list contains entries from the region specified including sub-localities

80 entries listed. 53 valid minerals.

Localities in this Region


The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Carlson, D.W. & W.B. Clark (1954), Mines and Minerals of Amador County, California: California Journal of Mines and Geology: 50: 167, 173, 175, 179, 180, 185, 189, 215.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 75, 436.

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