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Glen Mills Quarry, Glen Mills, Thornbury Township, Delaware Co., Pennsylvania, USA

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Extremely complex geology of Precambrian age. Series of interbedded greywackes and carbonates, along with graphitic gneiss and intermediate to dark igneous rock, folded and metamorphosed. The resulting rock types were then deformed again, and pegmatites were intruded, fracturing the total mass.

The quarry was first opened in 1884. In 1905 the General Crushed Stone Co. started operations and by 1976 was the largest quarry in the area at a depth of 300 feet. Although well below the elevation of nearby Chester Creek, water seepage is minimal.

Mineral List



15 entries listed. 10 valid minerals.

The above list 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.

References

Geyer, Smith, Barnes, Min. Col. Pennsylvania: 114-116.


Mineral and/or Locality  
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