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Fossils of Uncertain Affinity from the Upper Devonian of Iowa

Richard Arnold Davis and Holmes A. Semken, Jr.
Science
New Series, Vol. 187, No. 4173 (Jan. 24, 1975), pp. 251-254
Stable URL: http://www.jstor.org/stable/1739069
Page Count: 4
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Abstract

Thousands of specimens of the enigmatic fossil Gluteus minimus (new genus, new species) occur in a 5-centimeter-thick interval within the Maple Mill Shale and in equivalent deposits of the Devonian of eastern Iowa. They are roughly lenticular, bilobed fossils up to 11 millimeters in diameter and 8 millimeters thick. These objects, consistently asymmetrical in the same direction, defy placement in any known higher taxon when their morphology, histology, and apatitic composition are considered.

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