Early Devonian phacopid trilobites from Seville, Australia. Phacopidae of Victoria, Part 4.
Titel:
Early Devonian phacopid trilobites from Seville, Australia. Phacopidae of Victoria, Part 4.
Auteur:
Sandford, Andrew C.
Verschenen in:
Alcheringa
Paginering:
Jaargang 29 (2005) nr. 1 pagina's 1-28
Jaar:
2005
Inhoud:
Three new phacopid trilobites from the lower horizons of the Yeringberg Formation at Seville, Victoria are described. Paciphacops edgecombei sp. nov. occurs in a mudstone facies, and Reedops albertii sp. nov. and Chotecops chlupaci sp. nov. occur together in a calcareous siltstone facies. The latter are the only known representatives of their genera in Australia. A review of Reedops and Paciphacops (including the revision of Phacops mansfieldensis Etheridge & Mitchell, 1896 from Loyola, Victoria) establishes late Lochkovian to early Emsian, and Ludlow to Pragian stratigraphic ranges for these genera respectively. The occurrences of these phacopid genera at Seville indicate placement of the Pragian-Emsian boundary low in the Yeringberg Formation, but above the trilobites. A facies succession including the trilobite-bearing beds at Seville is considered to reflect a widely documented late Pragian regression, and further supports a late Pragian age for the fauna.
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