Fossils of Uncertain Affinity from the Upper Devonian of Iowa

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Science  24 Jan 1975:
Vol. 187, Issue 4173, pp. 251-254
DOI: 10.1126/science.187.4173.251


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.