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      • HARVEST
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      Problematic marine palynomorphs from the Silurian-Devonian Gaspe Limestones, Gaspe Peninsula, Quebec, Canada

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      NQ23931.pdf (15.15Mb)
      Date
      1995-07-01
      Author
      Cashman, Patrick Bradley
      Type
      Thesis
      Degree Level
      Doctoral
      Metadata
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      Abstract
      The study of the Gaspe Limestones reveals that a varied and rich assemblage of "chitinous" microfossils is present within most samples. The fossil evidence for hydrozoans and pterobranchs is presented relying heavily upon infra-red and scanning electron microscopical studies. Using similar methods, melanosclerites are described, their taxonomic status reinterpreted and their affinity reinterpreted. An extensive ultrastructural study of Chitinozoa biology has lead to an ontogenetic, and phylogenetic reinterpretation. They are concluded to be the extinct representatives of the protozoan sarcodines. The relationship of their preservation to early diagenesis of the substrate are also discussed. A new classification is presented as is the new hypothesis for their extinction at the end of the Devonian. The biostratigraphy of the Gaspe Limestones using chitinozoans is used and the evidence for the Silurian-Devonian boundary is presented as is the discontinuity of the Gaspe Limestones especially for the Roncelles Mbr. The evidence for the Silurian age of a fault block is also discussed.
      Degree
      Doctor of Philosophy (Ph.D.)
      Department
      Geological Sciences
      Program
      Geological Sciences
      Committee
      Sarjeant, William
      Copyright Date
      July 1995
      URI
      http://hdl.handle.net/10388/etd-10212004-000459
      Subject
      geology - Quebec
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      • Graduate Theses and Dissertations
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