Verrill, A. Hyatt (Alpheus Hyatt), 1871-1954 · New York, R. M. McBride & co. · leaf 48
es. Topaz crystals often occur in such situationsand in many places very curious crystal-like forma-tions of sandstone are found in similar situations(Fig. 2). Clay beds often yield strange masses ofstonelike material known as concretions (Fig. 3).They are usually recognizable by the concentric…
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