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National Limestone Quarry No. 1, Paxtonville, Middleburg Township, Snyder Co., Pennsylvania, USA

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Latitude & Longitude (WGS84): 40° 45' 59'' North , 77° 6' 48'' West
Latitude & Longitude (decimal): 40.76650,-77.11341
GeoHash:G#: dr1pvjrdp
Locality type:Quarry
Köppen climate type:Dfa : Hot-summer humid continental climate


National Limestone Quarries' main quarry, headquarters, and processing location. Excellent locality for calcite crystals, both clear, and orange in color, tan-colored dogtooth calcite, deep purple fluorite in dark gray limestone and purple fluorite in white massive calcite matrix, minor occurrances of pyrite, minor drusy quartz crystals, occasional occurrances of strontianite, and most importantly, and unique to this location, beautiful golden and white calcite travertine (flowstone) from a collapsed cave, which was uncovered on the north side of the main pit during the quarrying operations a few years ago. Some of the flowstone specimens contain rare helictite formations, and others contain crinoid fossils, incorporated right into the flowstone, and many complete stalactites and stalagmites have also been found, as well as crystallized, rippled and layered flowstone, suitable for slabbing and polishing. The flowstone fluoresces pale blue under SW UV light.
Perhaps this may be the only opportunity to collect specimens from this type of cave formation, since collecting in existing caves and caverns is illegal and unethical. Each year, crews continue to uncover more cave features and flowstone as quarrying continues.

This quarry is accessible to EFMLS-affiliated mineral clubs only, for group field collecting trips, from April thru October.(along with their smaller quarry in nearby Mt. Pleasant Mills, famous for clear calcite crystals of large sizes, strontianite, and their world famous wavellite on fossil bearing matrix).

(Note: The Google Maps address to the quarry is incorrect. The correct address is 3499 Quarry Road, Middleburg, Pennsylvania.)


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


6 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

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

Paleozoic
252.17 - 541 Ma



ID: 3187973
Paleozoic sedimentary rocks

Age: Paleozoic (252.17 - 541 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Devonian - Silurian
358.9 - 443.8 Ma



ID: 2986299
Keyser and Tonoloway Formations, undivided

Age: Paleozoic (358.9 - 443.8 Ma)

Stratigraphic Name: Keyser Formation; Tonoloway Formation; Coeymans Formation; Rondout Formation; Decker Formation; Wills Creek Formation

Description: In descending order: Keyser Formation--medium-gray, crystalline to nodular, fossiliferous limestone; upper part laminated and mud-cracked; not present east of Harrisburg; passes into lower Coeymans, Rondout, and Decker Formations in the east. Tonoloway Formation--medium-gray, laminated, mud-cracked limestone containing some medium-dark- or olive-gray shale interbeds; lower part passes into Wills Creek Formation east and south; passes into Bossardville and Poxono Island beds in the east.

Lithology: Major:{limestone}, Minor:{shale}

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.

References

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Wilson, Jeffrey D. (2017), personal communication to Mindat.org based on personal accounts from numerous collecting field trips to this location with the North Jersey Mineralogical Society.

External Links

www.nationallimestonequarry.com

Mineral and/or Locality  
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