Microstructural and geochemical investigation of North American lower-middle Paleozoic trilobites and recent arthropods
Trilobites ¥tere collected from Ordovician and Devonian formations of Ontario} New York} Ohio} Oklahoma} and Indiana. Diversity was generally low} but 19.?telllS and Ph.~tY>ps ¥tere the most abundant species from the Ordovician and Devonian} respectively. Recent marine arthropods ¥tere collected...
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ftbrockuniv:oai:dr.library.brocku.ca:10464/1959 2024-06-09T07:49:31+00:00 Microstructural and geochemical investigation of North American lower-middle Paleozoic trilobites and recent arthropods McAllister, John E. Department of Earth Sciences 2009-07-09T18:39:05Z http://hdl.handle.net/10464/1959 eng eng Brock University http://hdl.handle.net/10464/1959 Trilobites Arthropoda--North America Paleontology|yPaleozoic Paleontology--North America Geochemistry Microstructure Electronic Thesis or Dissertation 2009 ftbrockuniv 2024-05-16T06:42:42Z Trilobites ¥tere collected from Ordovician and Devonian formations of Ontario} New York} Ohio} Oklahoma} and Indiana. Diversity was generally low} but 19.?telllS and Ph.~tY>ps ¥tere the most abundant species from the Ordovician and Devonian} respectively. Recent marine arthropods ¥tere collected from the Atlantic shore of the middle Florida Keys} and from the Pacific and lagoonal waters at Cape Beale} B. C. Fresh-water arthropods were collected along the shore of the Severn River in northcentral Ontario. Cuticles ¥tere analyzed for major} minor and trace elements, 180 and 13C isotopes, as ¥tell as examined by scanning electron micr?scope to identify original and diagenetic fabrics. Examination of trilobite cuticles by scanning electron microscope revealed several microstructures consistent with those observed in Recent arthropods. Microstructures} such as setae and tegumental gland duct openings} in like sized Lim/IllS and Isoteline trilobites may indicate common ancestral origins for these organisms, or simply parallel cuticle evolutions. The dendritic microstructure, originally' thought to be a diagenetic indicator, was found in Recent specimens and therefore its presence in trilobites may be suggestive of the delicate nature of diagenesis in trilobites. The absence of other primary microstructures in trilobites may indicate alteration, taxonomic control} or that there is some inherent feature of S EM examination which may' not allow detection of some features} while others are apparently visit·le onl~1 under SH.·1. The region of the cuticle sampled for examination is also a major influence in detecting pristine microstructures, as not all areas of trilobite and Recent arthropod cuticles will have microstructures identifiable in a SEM study. Subtleties in the process of alteration, however} ma~·· leave pristine microstructures in cuticles that are partial~/ silicified or do 10m itized, and degree and type of alteration may vary stratigraphically and longitudinally within a unit. The presence of fused ... Thesis Severn River Brock University Digital Repository Beale ENVELOPE(162.750,162.750,-66.567,-66.567) Cape Beale ENVELOPE(155.500,155.500,-80.300,-80.300) Pacific Severn River ENVELOPE(-87.600,-87.600,56.034,56.034) |
institution |
Open Polar |
collection |
Brock University Digital Repository |
op_collection_id |
ftbrockuniv |
language |
English |
topic |
Trilobites Arthropoda--North America Paleontology|yPaleozoic Paleontology--North America Geochemistry Microstructure |
spellingShingle |
Trilobites Arthropoda--North America Paleontology|yPaleozoic Paleontology--North America Geochemistry Microstructure McAllister, John E. Microstructural and geochemical investigation of North American lower-middle Paleozoic trilobites and recent arthropods |
topic_facet |
Trilobites Arthropoda--North America Paleontology|yPaleozoic Paleontology--North America Geochemistry Microstructure |
description |
Trilobites ¥tere collected from Ordovician and Devonian formations of Ontario} New York} Ohio} Oklahoma} and Indiana. Diversity was generally low} but 19.?telllS and Ph.~tY>ps ¥tere the most abundant species from the Ordovician and Devonian} respectively. Recent marine arthropods ¥tere collected from the Atlantic shore of the middle Florida Keys} and from the Pacific and lagoonal waters at Cape Beale} B. C. Fresh-water arthropods were collected along the shore of the Severn River in northcentral Ontario. Cuticles ¥tere analyzed for major} minor and trace elements, 180 and 13C isotopes, as ¥tell as examined by scanning electron micr?scope to identify original and diagenetic fabrics. Examination of trilobite cuticles by scanning electron microscope revealed several microstructures consistent with those observed in Recent arthropods. Microstructures} such as setae and tegumental gland duct openings} in like sized Lim/IllS and Isoteline trilobites may indicate common ancestral origins for these organisms, or simply parallel cuticle evolutions. The dendritic microstructure, originally' thought to be a diagenetic indicator, was found in Recent specimens and therefore its presence in trilobites may be suggestive of the delicate nature of diagenesis in trilobites. The absence of other primary microstructures in trilobites may indicate alteration, taxonomic control} or that there is some inherent feature of S EM examination which may' not allow detection of some features} while others are apparently visit·le onl~1 under SH.·1. The region of the cuticle sampled for examination is also a major influence in detecting pristine microstructures, as not all areas of trilobite and Recent arthropod cuticles will have microstructures identifiable in a SEM study. Subtleties in the process of alteration, however} ma~·· leave pristine microstructures in cuticles that are partial~/ silicified or do 10m itized, and degree and type of alteration may vary stratigraphically and longitudinally within a unit. The presence of fused ... |
author2 |
Department of Earth Sciences |
format |
Thesis |
author |
McAllister, John E. |
author_facet |
McAllister, John E. |
author_sort |
McAllister, John E. |
title |
Microstructural and geochemical investigation of North American lower-middle Paleozoic trilobites and recent arthropods |
title_short |
Microstructural and geochemical investigation of North American lower-middle Paleozoic trilobites and recent arthropods |
title_full |
Microstructural and geochemical investigation of North American lower-middle Paleozoic trilobites and recent arthropods |
title_fullStr |
Microstructural and geochemical investigation of North American lower-middle Paleozoic trilobites and recent arthropods |
title_full_unstemmed |
Microstructural and geochemical investigation of North American lower-middle Paleozoic trilobites and recent arthropods |
title_sort |
microstructural and geochemical investigation of north american lower-middle paleozoic trilobites and recent arthropods |
publisher |
Brock University |
publishDate |
2009 |
url |
http://hdl.handle.net/10464/1959 |
long_lat |
ENVELOPE(162.750,162.750,-66.567,-66.567) ENVELOPE(155.500,155.500,-80.300,-80.300) ENVELOPE(-87.600,-87.600,56.034,56.034) |
geographic |
Beale Cape Beale Pacific Severn River |
geographic_facet |
Beale Cape Beale Pacific Severn River |
genre |
Severn River |
genre_facet |
Severn River |
op_relation |
http://hdl.handle.net/10464/1959 |
_version_ |
1801382154885660672 |