One broken fragment of relatively fresh andesite or basalt with numerous feldspar phenocrysts about 4 X 2 X 1 and coated with manganese; fragment of about the same size of volcanic ash; rhyolite pumice; green tuff breccias; several smaller rock fragments all with Mn crusts up to 1 thick; one large Mn fragment 1 1/4 thick X 4 X 5; numerous Mn crust fragments; 3 pints of globigerina sand placed in Mason jars. Location: Sylvania Guyot.
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