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Powder River Basin Impactite Mineral Specimen

Currency:USD Category:Collectibles / Western Americana Start Price:10.00 USD Estimated At:400.00 - 600.00 USD
Powder River Basin Impactite Mineral Specimen
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8" by 5" by 3". 2600 grams. Provenance: From the estate of Moosehead Gallery rock shop in Hamilton, Montana. Interesting specimen. Impactite, suspect Powder River Basin Impact or larger impact. Cone in cone forms. Melt expansion nodule with surface mosaic. High energy and rapid formation. Orogeny: Chevron forms are not associated with volcanic mafic raised form small specimens. The specimen has a melt core matrix therefore the surface is an expansion mosaic. The surface is too complex for mud drying cracks nor would mud form a rock without a high energy event. The Montana Badlands has a high amount of impact ash indicating a very large earth impact. Complex stress surfaces are the physical result of an accretion body.