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Journal Article

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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Topics: Fossils, Horses, Geology, Ants, Ketones, Worker insects, Shales, Smooth surfaces, Vertebrates, Insect behavior
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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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