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Science. 1975 Jan 24;187(4173):251-4.

Fossils of uncertain affinity from the upper devonian of iowa.

Abstract

Thousands of specimens of the enigmatic fossil Gluteus minimus (new genus, newt 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 diamiter and 8 milllimeters thic. These objects consistently asymmetrical in the same direction. defy placement in any known higher taxon when their morphology. histology, and apatitic composition considered.

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