File:Dalaporfyr.jpg
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Svenska: Dalarnas landskapssten, dalaporfyren, har sitt ursprung i våldsamma vulkanutbrott på ett 15 kvadratmil stort område för 1,7 miljarder år sedan, Glödande moln av lava och lava full av gaser sprutade upp och rann ner över omgivningen, utan motstånd, blixtsnabbt och brännhett. Varje utbrott hade sin unika sammansättning och därför finns det över hundra varianter av dalaporfyren, bland annat älvdalsporfyr |
| Date | |
| Source | www.sgu.se |
| Author | Photo: Anders Damberg |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 07:30, 8 May 2018 | | 1,738 × 1,409 (377 KB) | Bergjordvatten (talk | contribs) | User created page with UploadWizard |
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