Chert-Shale-Mudstone
Chert-Shale-Mudstone
Chert-Shale-Mudstone
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Laminated mudstone and carbonaceous shaleABA, Laminated dark grey toblack mudstone consisting siltinterstratified with dark shale.B, <strong>Shale</strong>, showing severalbeds of carbonaceous shalealternating with graded siltmudcoupletsFrom Blatt and Tracy, 199611