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Marriottsville Quarry, Hernwood, Baltimore Co., Maryland, USA

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Latitude & Longitude (WGS84): 39° 22' 27'' North , 76° 52' 3'' West
Latitude & Longitude (decimal): 39.37432,-76.86768
GeoHash:G#: dqcrfzfsj
Locality type:Quarry
Köppen climate type:Cfa : Humid subtropical climate


Opening in Cockeysville Marble. Rocks present are fine grained dolomitic marble and coarser grained calcite marble with local calc-silicate areas, lenses of phlogopite schist and pegmatite pods.

Currently (2018) operated by Bluegrass Materials.


Mineral List


16 valid minerals.

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

Proterozoic
541 - 2500 Ma



ID: 3009292
Wissahickon Formation; Lower Pelitic Schist

Age: Proterozoic (541 - 2500 Ma)

Stratigraphic Name: Wissahickon Formation

Description: (Formerly mapped as oligoclase facies of Wissahickon Formation.) Medium- to coarse-grained biotite-oligoclase-muscovite-quartz schist with garnet, staurolite, and kyanite; fine- to medium-grained semipelitic schist; and fine-grained granular to weakly schistose psammitic granulite; psammitic beds increase upward; apparent thickness 5,500 feet or more.

Lithology: Major:{biotite schist}, Minor:{granulite}

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]

Mesoproterozoic
1000 - 1600 Ma



ID: 3193072
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1000 - 1600 Ma)

Lithology: Orthogneiss

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]

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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Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.

Mineral and/or Locality  
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