A core that penetrated the New Albany Shale (upper Devonian and lower Mississippian) was obtained from Clark County in southeastern Indiana. An unusual specimen of intercrystallized apatite and ankerite was found within the black shale. This sample, which is 0.1 foot thick, was obtained approximately 1 foot stratigraphically below the top of the New Albany Shale. Similar material has been seen in approximately the same stratigraphic position at five other localities in Indiana; the sample from Clark County best illustrates the relationships described in this note.

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