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Published December 31, 2020 | Version v1
Journal article Open

Middle-Late Triassic radiolarian assemblages from chert clasts of the Excelsior Gulch conglomerate (Wallowa terrane, Oregon, U.S.A.)

Creators

  • 1. Department of Geology, Alexandria University, Moharam Bey, 21511 Alexandria, Egypt. E-mail: geo.hmk@gmail.com, geo.hmk@alexu.edu.eg / Department of Earth Sciences, University of Geneva, 13 rue des Maraîchers, CH-1205 Genève, Switzerland.
  • 2. Institute of Earth Sciences, University of Lausanne, Bâtiment Géopolis, CH-1015 Lausanne, Switzerland. E-mail: Peter.Baumgartner@unil.ch
  • 3. Department of Earth and Environmental Sciences, Kumamoto University, Kumamoto, 860-8555 Japan. E-mail: onoue@sci.kumamoto-u.ac.jp
  • 4. Department of Earth Sciences, University of Geneva, 13 rue des Maraîchers, CH-1205 Genève, Switzerland. E-mail: Nicolo.DelPiero@unige.ch
  • 5. Department of Geosciences CHCB 302, 32 Campus Drive #1296, Missoula, MT 59812 USA. E-mail: george.stanley@umontana.edu
  • 6. Asian School of the Environment, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459. E-mail: SRigaud@ntu.edu.sg
  • 7. Department of Earth Sciences, University of Geneva, 13 rue des Maraîchers, CH-1205 Genève, Switzerland. E-mail: Rossana.Martini@unige.ch

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Description

New radiolarian data from the polymict Excelsior Gulch conglomerate (Wallowa terrane, Blue Mountains Province, Oregon, USA) allow narrowing the age of the chert components. Chert clasts sampled at three distinct localities yielded radiolarians that have Middle to Late Triassic ranges. Individual taxon ranges allow for the distinction of four continuous substages: early Ladinian (presence of Triassocampe nishimurae and T. postdeweveri), middle Ladinian (with Pseudotriassocampe hungarica), late Ladinian (presence of Muelleritortis cochleata and Tritortis kretaensis), and early Carnian (with the co-occurrence of species such as Muelleritortis spp. ex. gr. M. cochleata, Tritortis dispiralis, ?Corum delgado and Triassocingula perornatum). The reworked chert clasts represent Middle to Late Triassic Panthalassan open ocean sediments that have not been described in the Blue Mountains Province.

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