Late Přidoli, Lochkovian, and early Pragian conodants from the Gap area between Larras Lee and Eurimbla, central western NSW, Australia

John R. Farrell*

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Conodonts from three sections in the Camelford and Garra Limestones from The Gap area, central western NSW, has produced four zonal index species: Ozarkodina remscheidensis eosteinhornensis, Icriodus woschmidti, Pedavis pesavis, and Eognathodus irregularis (= Eog. sulcatus eosulcatus), and one species indicative of the I. postwoschmidti Zone (eurekaensis Zone). Carbonate sedimentation of the Camelford Limestone began in the very latest Pridoli and continued through the eurekaensis Zone. In the vicinity of the sections, the Camelford Limestone is faulted against the Garra Limestone with some loss of sections from both units. Approximately 4 km to the north, a volcaniclastic unit, the Cuga Burga Volcanics, separates the two carbonate sequences. Samples from the lowest limestone horizons within the Garra Limestone which sit conformably on the volcanics have yielded Amydrotaxis aff. praejohnsoni (= ?delta Zone). Carbonate sedimentation continued through the pesavis Zone and into the very early sulcatus Zone. The Late Devonian Catombal Group lies unconformably above the Garra Limestone. As both have undergone major folding and erosion, loss of section at the top of the Garra Limestone is possible. Farther north at Wellington, deposition of the Garra Limestone commenced in the Lochkovian (pesavis Zone) and the youngest horizons now represented in outcrop have been dated as earliest Emsian (pireneae/dehiscens Zone) (WILSON 1989). The lowest horizons of the Camelford Limestone containing conodont faunas are dated within the Pridoli, with the topmost layers possibly extending into the Lochkovian (delta Zone). This indicates diachronism in the Garra Limestone, with younger sediments being deposited in the north. Three new species and one new subspecies of Pandorinellina (Pand. ebzeryi, Pand. kylieae, Pand. wilsoni, and Pand. optima postoptima) and two new species of Ozarkodina (Oz. scotti and Oz. andersonae) have been documented.

Original languageEnglish
Pages (from-to)107-181
Number of pages75
JournalCFS Courier Forschungsinstitut Senckenberg
Issue number245
Publication statusPublished - 30 Dec 2003

Keywords

  • Camelford Limestone
  • Conodonts
  • Early Pragian
  • Garra Limestone
  • Late Přidol
  • Lochkovian

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