Tonstein

Specimen ID: W6J-W03

Mineral(s)
Locality
Mindat locality:
Dimensions
15cm x 14cm
Events

Photo added to mindat.org

Coal tonstein of Seam No. 365 (15th Petřvald Coal, Gabriela) of the Upper Silesian Basin. Interesting is root clay at the uppermost part of the sample, indicating coal-vegetation growth directly after the ashfall. U-Pb isotopic age of zircons from this tonstein yielded age 325.64 Ma - Upper Carboniferous age, Serpukhovian stage. Collection of Geological pavilon of prof. F. Pošepný at VŠB-Technical University of Ostrava.
Jakub Jirásek - 2nd January 2020
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