• Login
    View Item 
    •   Home
    • Theses and Dissertations
    • Theses and Dissertations
    • View Item
    •   Home
    • Theses and Dissertations
    • Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of TUScholarShareCommunitiesDateAuthorsTitlesSubjectsGenresThis CollectionDateAuthorsTitlesSubjectsGenres

    My Account

    LoginRegister

    Help

    AboutPeoplePoliciesHelp for DepositorsData DepositFAQs

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Bone Histology and Geochemical Taphonomy of Arctic Centrosaurine Ceratopsids from the Kikak-Tegoseak Quarry (North Slope, Alaska)

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Goldsmith_temple_0225M_13434.pdf
    Size:
    5.685Mb
    Format:
    PDF
    Download
    Genre
    Thesis/Dissertation
    Date
    2018
    Author
    Goldsmith, Erika
    Advisor
    Tumarkin-Deratzian, Allison
    Committee member
    Chemtob, Steven M.
    Grandstaff, David E.
    Fiorillo, Anthony R.
    Department
    Geology
    Subject
    Paleontology
    Geology
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/1315
    
    Metadata
    Show full item record
    DOI
    http://dx.doi.org/10.34944/dspace/1297
    Abstract
    Pachyrhinosaurus perotorum, a paleo-Arctic centrosaurine ceratopsid from the Kikak-Tegoseak Quarry (North Slope, Alaska) represents a unique opportunity to add to the understanding of ceratopsian bone histology, which is poorly understood due to the minimal preservation of growth markers (e.g. lines of arrested growth) and limited histological sampling across the ceratopsian lineage. Histological analyses of eight rib fragments from P. perotorum were conducted to add to the understanding of ceratopsian growth dynamics. Cyclical growth is preserved within ribs from P. perotorum allowing for the assignment of relative ontogenetic ages. One juvenile (DMNH 23891), 4 sub-adults (DMNH 21574, DMNH 24384, DMNH 24228, and DMNH 23888), and one adult (DMNH 24237) were identified. Radial and reticular fibrolamellar bone is prevalent in juvenile and sub-adult individuals indicating P. perotorum grew rapidly during ontogeny. Dense secondary bone is widespread in adult and three sub-adult individuals, which obscures most primary bone tissue and lines of arrested growth (LAGs). The degree of remodeling is higher than that previously reported in dinosaur rib histology, and may be attributable to differences in element-specific growth rate, environmental or biomechanical stresses. However, more histological studies of P. perotorum comparing growth between different postcranial long bones are needed to constrain the controls of secondary bone within this paleo-Arctic species. Although previous studies have interpreted taphonomy of the Kikak-Tegoseak Quarry (KTQ) using sedimentological and paleontological data, less is known about the geochemical taphonomy of this assemblage. P. perotorum bone has been altered from carbonate-hydroxyapatite to carbonate fluorapatite. XRD full width half maximum (FWHM) values display narrower peak widths (0.29-0.35°) than modern bone indicating a more crystalline apatite lattice structure. ATR-FTIR infrared splitting factor (IR-SF) values in P. perotorum specimens are greater (3.3-3.6) than in modern bone indicating that apatite crystallite sizes are larger than what is typically found in non-fossil bone. Higher crystallinity is a common result in fossil bone due the growth of authigenic apatite. ATR-FTIR spectra reveal elevated carbonate due to the addition of B-type carbonate into the apatite lattice. Relative amounts of carbonate correlates with ontogeny which could reflect a biological signal, although the effect of diagenetic alteration cannot be ruled out. Based on the elevated carbonate within bones of P. perotorum, there is potentially significant diagenetic alteration of the δ18Ocarbonate signal, therefore future stable isotope studies from the KTQ P. perotorum specimens should be cautious. Determining the potential chemical alteration of the δ18Ophosphate is more difficult since crystallinity data cannot differentiate between biogenic and secondary phosphate in bone. However, depleted carbonate: phosphate ratios can indicate the addition of more phosphate and thus, potential diagenetic alteration of the δ18Ophosphate. REE spider patterns yield different patterns between P. perotorum bones, which indicates taphonomic reworking (spatial and/or temporal) due to the preservation of different redox conditions and diffusion periods between bones. This observation is surprising due to the lack of significant/variable bone weathering or abrasion.
    ADA compliance
    For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu
    Collections
    Theses and Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2023)  DuraSpace
    Temple University Libraries | 1900 N. 13th Street | Philadelphia, PA 19122
    (215) 204-8212 | scholarshare@temple.edu
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.