J. Harold Hudson, Eugene A. Shinn, Robert B. Halley, Barbara Lidz; Sclerochronology: A tool for interpreting past environments. Geology ; 4 (6): 361–364. doi: https://doi.org/10.1130/0091-7613(1976)4<361:SATFIP>2.0.CO;2
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X-radiographs of stony coral slabs reveal two types of annual density bands. Detailed studies of these bands in relation to known variations in air temperatures indicate that sclerochronology is a valid tool for documenting time sequences and changing environmental conditions on a coral reef.