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Poracanthodid Acanthodian from the Upper Silurian (Pridoli) of Nevada

Carole J. Burrow
Journal of Vertebrate Paleontology
Vol. 23, No. 3 (Sep. 12, 2003), pp. 489-493
Stable URL: http://www.jstor.org/stable/4524343
Page Count: 5
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Poracanthodid Acanthodian from the Upper Silurian (Pridoli) of Nevada
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Abstract

Dissociated remains of the acanthodian Poracanthodes punctatus are described from Upper Silurian (Pridoli) limestones of the Roberts Mountains Formation at Pete Hanson Creek, Eureka County, Nevada. The vertebrate microremains in sample residues comprise scales, a dentigerous jaw bone fragment, and a fin spine fragment assigned to P. punctatus, plus one possible acanthothoracid placoderm scale. Some macroremains from the same locality are also assigned to P. punctatus. This taxon has been nominated as a zone fossil for the Silurian vertebrate biozonal scheme, and its presence has been recorded throughout the circum-Arctic region. Identification of the taxon in Nevada extends its known geographic range.

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