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Pockrandt Quarry (Edward Kraemer and Sons; Inc.), Glover Bluff, Marquette Co., Wisconsin, USA

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Latitude & Longitude (WGS84): 43° 58' 46'' North , 89° 31' 54'' West
Latitude & Longitude (decimal): 43.9794444444, -89.5316666667

Currently active (2015) quarry in Ordovician Prairie du Chien group dolostone. Quarry is apparently on the rim of a poorly preserved impact crater (the Glover Bluff structure), and is a source of specimens of shattercones and impactite breccia. Recent work (Renard, 2011) implies the impact was possible of Recent age.

Mineral List

4 valid minerals.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

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!

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.


Ekern, G. I. & F. T. Thwaites (1930) The Glover Bluff Structure: a disturbed area in the Paleozoics of Wisconsin: Transactions of the Wisconsin Academy of Science, Arts and Letters: 25: 89-97.

Read, W. F. (1983) Shatter cones at Glover Bluff, Wisconsin: Meteoritics: 18 (3): 241-243.

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