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Glen Avon Quarry (Glen Avon Limestone deposit; Mathews), Glen Avon, Riverside Co., California, USA

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Latitude & Longitude (WGS84): 34° 1' 26'' North , 117° 29' 3'' West
Latitude & Longitude (decimal): 34.0238888889, -117.484444444

A former marble (dimension) deposit/quarry located in the SE¼NW¼SW¼ sec. 2, T2S, R6W, SBM. MRDS database stated accuracy for this location is 100 meters.

Local rocks include pre-Cenozoic metasedimentary and metavolcanic rocks undivided.

Workings include unspecified surface openings.

The Glen Avon “quarry” consists of 3 small excavations near the top of a hill, NW of the coordinates shown as you suggest (same as Mindat coordinates- Steve Stuart). It was originally operated as a source of grit for chickens. (They need calcite to produce good egg shells.) It has been abandoned for at least 70 years (Robert Housley).

Following our meeting in August, 2001 Anne Seminaris led a field trip to the nearby Glen Avon Quarries. Even though it was an uncommonly hot day about ten people participated. Fortunately we found a route that allowed us to drive almost to the first small quarry of the three. I had been here many years ago on an MSSC field trip led by Mel Larsen and so remembered a little about what to expect. These small quarries have not been worked in a long time and everything is overgrown and dirty. At first they do not appear promising, but in fact they are pretty interesting.

The first and southernmost quarry, also the smallest, is totally in recrystallized limestone. In the coarser parts where the calcite rhombs get up to about an inch across there are regions containing nice micros of golden brown phlogopite. In the finer grained dark appearing calcite there are regions with nice graphite micros. A couple of small regions near the entrance on the right contain fine grained purple spinel and chondrodite. I found one axinite crystal in weathered material on the left. A pit below this quarry contains veins of fibrous tremolite.

The walls of the two larger quarries are largely calc-silicate rock and I spent the bulk of my time with that. Below the middle quarry I broke up a rock that contained numerous cinnamon brown garnets to about half and inch, but mostly smaller.

In the northern quarry I worked and area of the north wall that appeared to be a very dirty porous plagioclase and brought home several chunks. They required a lot of cleaning and trimming, but proved to be quite interesting. It appears that at one time this rock was an intergrowth of diopside and plagioclase with minor titanite and zircon. It appears that as the temperature dropped in the fluid rich environment diopside became unstable and was largely leached out. Later still actinolite, axinite, and apatite were deposited in the resulting cavities. After much cleaning I recovered nice micros of all the minerals mentioned from these pieces. The axinites are especially well developed.

Even though we worked in slow motion because of the heat I think everybody found something of interest. About 5:30 though we all decided we had had all the fun we could stand for one day and retired to a nearby Mexican restaurant recommended by Anne for food and refreshment and conversation. Now I am ready to go back to Glen Avon and try it again soon.

Mineral List

6 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Pleistocene - Middle Pleistocene
0.0117 - 0.781 Ma
Old alluvial-fan deposits, Unit 1

Age: Pleistocene (0.0117 - 0.781 Ma)

Description: On south side of San Bernardino Mountains, moderately dissected interstratified sand and gravel capped by soils having Bt horizons as much as 50 to 150 cm thick (Ramona soils of Woodruff and Brock, 1980). On north side of San Bernardino Mountains, reddish-brown alluvial fan deposits of primarily sand- to boulder- sized clasts that are moderately consolidated and slightly to moderately dissected. Distinguished as terraces cut into locally older Qof sediments. On north side of San Bernardino Mountains, chiefly restricted to small area northeast of Silverwood Lake. There, distinguished from other Quaternary units using aerial photographs; deposits are distinctly elevated and more dissected than Qyf units, but less dissected than locally older Qof units

Reference: Morton, D.M., F.K. Miller . Geologic Map of the San Bernardino and Santa Ana 30' x 60' quadrangles, California. U.S. Geological Survey Open-File Report 2006-1217. [42]

Cretaceous - Paleoproterozoic
66 - 2500 Ma
pre-Cenozoic metasedimentary and metavolcanic rocks undivided

Age: to Cretaceous (66 - 2500 Ma)

Stratigraphic Name: Kings Sequence; McCoy Mountains Formation (part); Palm Canyon Complex; Placerita Formation

Description: Undivided pre-Cenozoic metasedimentary and metavolcanic rocks of great variety. Mostly slate, quartzite, hornfels, chert, phyllite, mylonite, schist, gneiss, and minor marble.

Lithology: Major:{schist,gneiss}, Minor:{quartzite,argillite}, Incidental:{phyllite, metavolcanic, slate, hornfels, marble, chert, sandstone, mudstone, conglomerate}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.


MacKevett, Edward Malcolm, Jr. (1951), Geology of Jurupa Mountains, San Bernardino and Riverside Counties, California: California Division Mines, Special Report 5, 14 pp.: 13, Pl. 5.

Housley, Robert (2001), Microbits (Southern California Micromineralogists bulletin) (Oct/Nov).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077142 & 10115667.

U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060650826.

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