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Very Rare Large Shatter Cone Glover Bluff Wisconsin
This is a great shatter cone found at the Glover Bluff impact site with distinctive horsetailing. Glover Bluff is a meteorite crater located about 4 miles from Colona, WI, USA. It is 5 miles in diameter and its age is estimated to be less than 500 million years (Cambrian or younger). The crater is exposed at the surface and this impact site is one of the least studied in the world, because for years the uplifted central area has been actively quarried for dolomite beneath the moraine left by retreating glaciers. Ironically, the very evidence of shatter cones and impact breccia which is the supporting evidence of a meteoritic impact uncovered in the quarrying process - is systematically being destroyed, not unlike the Kentland Impact structure and a few others.
Evidence for the Glover Bluff impact site includes: a central bulge, dipped strata, the presence of “shatter cones” (although no longer as common as they may once have been), and, “impact breccia.” The color of the impact breccia is of “red” and “yellow” varieties (more of a brick red and tan yellow) and sometimes a mixture of the two. The breccia contains many broken fragments (or shards) of quartzite and other rocks.
This great compact shatter cone was formed in powder-fine yellow dolomite. The superb and very distinctive features with prominent horsetailing makes it a great addition to any serious meteorite impact materials collection.
Size: 175mm H X 114mm W X 35mm D, weight: 884 grams or 31 ounces or not quite 2 lbs.
Ships with information, Certificate of Authenticity and tag. Cube and stands not included.
Click pictures to enlarge. Legally collected on a geological expedition by Jensan Scientifics, on private land.
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