GEOSCAN Search Results: Fastlink


TitleOn the discovery of a new invertebrate ichnofossil assemblage from Doyles Cove, Prince Edward Island
AuthorStimson, M R; Dafoe, L; McAskill, K S A; Perry, C
SourceThe Carboniferous-Permian Transition Conference; 2013 p. 1
Alt SeriesEarth Sciences Sector, Contribution Series 20130013
PublisherNew Mexico Museum of Natrual History & Science
MeetingThe Carboniferous-Permian Transition Conference; Albuquerque; US; May 20-22, 2013
File formatpdf
ProvincePrince Edward Island
AreaDoyles Cove
Lat/Long WENS -63.5000 -63.0000 46.5000 46.2500
Subjectspaleontology; fossil assemblages; fossil distribution; fossils; ichnofossils; trace fossils; Pictou Group; Paleozoic; Permian; Carboniferous
ProgramFrontier basin analysis, Geoscience for New Energy Supply (GNES)
AbstractA newly discovered ichnofossil of invertebrate walking traces from Doyles Cove, PEI has initiated a renewed interested in the paleoichnology of Prince Edward Island. The geological and paleontological history of the upper Carboniferous- lower Permian aged Pictou Group of Prince Edward Island is well understood. Work conducted by previous researchers has unearthed abundant specimens of macroflora (ie. Walchia and Tylodendron), vertebrate remains (ie. Bathygnathus) and vertebrate trace fossils (ie. Gilmoreichnus, Notalacerta, Limnopus). A lesser known aspect of the Island's paleontology is the invertebrate paleoichnology. We present the first example of invertebrate walking traces from Prince Edward Island discovered by one of us (CP). Discoveries of invertebrate trace fossils have previously been restricted to burrows, and have been discussed briefly in previous works as fucoid-like trace fossils, worm borings and ferruginized root tubes, although none have been studied in detail. The specimen was observed within the upper fine-grained facies of the Orby Head Formation (megacycle 4) of the Pictou Group at Doyles Cove (46°28'24.79N, 63°18'09.40W). Preliminary assessments of the invertebrate ichnofauna exhibit a low diversity ichnofossil assemblage. Invertebrate walking traces include a single ichnospecies (Diplichnites gouldi), while invertebrate burrows include: Cochlichnus, Treptichnus, Taenidium, Haplotichnus, and Planolites. The ichnofossils are associated with greenish grey reduction zones at the base of individual fluvial cycles, which are overlain by oxidized trough cross-bedded fluvial channel sequences. The Permian (Artinskian-aged) sediments have been interpreted as being deposited under arid conditions with a declining biodiversity based on micro- and macropaleoflora assemblages. We assign the trace fossil Diplichnites gouldi described here to myriapods which seemed to be present in this arid climate. The burrows seen at Doyles Cove reflect a low diversity suite of surface or near surface grazing and feeding structures, as well as infaunal feeding structures of primarily annelids or other small invertebrates. Depositional environments which yield trace fossils are interpreted as shallow-water floodplains or ephemeral ponds/lakes adjacent to fluvial channels.
Summary(Plain Language Summary, not published)
The Maritimes basin was a large area that covered what is now part of Nova Scotia, New Brunswick, Prince Edward Island, Newfoundland and the Gulf of St. Lawrence during the Carboniferous over 300 million years ago. The layers of sediment that accumulated in this area now form part of an economically significant petroleum system. Despite the previous research conducted on these Carboniferous rocks, questions still remain about the origin of the rocks and how the nature of the rocks link to their petroleum potential. The current research involves a paleontological understanding of poorly understood Maritimes Basin sediments from Prince Edward Island. This work builds upon our understanding of the environment in which the sediments accumulated, which can help to explain the nature of reservoirs and potential oil and gas source rocks. The rocks at Doyles Cove, PEI show the mixed and complicated nature of Carboniferous reservoirs in which river floodplains and shallow lakes allowed for accumulation of muddy layers that decrease the viability of Carboniferous reservoir sandstones.