Specimen ID: W6J-W03

Mindat locality:
15cm x 14cm

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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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