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| Abstract: | The Ritland impact structure (western Norway), 2.7 km in diameter and about 350 m deep, is a depression partly fi lled by post‐impact Cambrian shales (upper photo; courtesy of Knut Vindfallet). The lower left photo shows well‐exposed, fractured Precambrian basement, while the lower right photo illustrates the melt rock with dark inclusions of devitrifi ed melt clasts in a light gray matrix (weathered surface) (coin is about 2.5 cm across). Images courtesy of E. Kalleson and H. Dypvik. |
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