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Evaluation of Conventional Analog and New Digital Modeling Methods for Describing Ammonoid Suture Patterns

Cornelius, Camden
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1683745822743357

Abstract Details

2023, Master of Science (MS), Bowling Green State University, Geology.
Ammonoid suture patterns have long been a point of interest in the study of this extinct cephalopod group, as they can be used for phylogenetic classification, understanding organismal growth, and many other topics of inquiry. These patterns are traditionally recorded as flat lines through tracings made using tape placed on fossil specimens, which causes distortion of the original shape. This problem prompts the need for a solution that may help to increase the accuracy of the data collected from suture patterns. Fourteen ammonoid specimens representing nine species and four suborders and spanning the Middle Devonian to Late Cretaceous Periods were digitally modeled, and their 3D digital suture patterns were then compared to 2D tracings. First, 3D models of the specimens were made using photogrammetry, which is a low-cost method with a low barrier to entry done by compiling photographs taken of a specimen and stitching them together into a 3D model using open-source software. The original goal was to then digitally flatten the 3D models using additional software to create 2D representations of their suture patterns that could then be compared to the tracings created using the traditional hand-traced tape method. While there were technical complications with the 3D to 2D conversion, the method of photogrammetry produced accurate depictions of the original specimens, based on visual comparison of the 3D and 2D suture patterns. Several notable factors influenced the quality of the 3D model created using this photogrammetry method, including the preserved definition of the suture pattern, the reflectiveness of the fossil’s surface, and the uniformity of color of the fossil. With these factors taken into consideration, photogrammetry can be a very accurate and cost-effective method for digitizing fossils, opening up a range of potential new morphometric analyses and expanding access to these important paleontological specimens beyond those able to physically visit fossil collections.
Margaret Yacobucci, Ph. D (Committee Chair)
Yuning Fu, Ph. D (Committee Member)
Peter Gorsevski, Ph. D (Committee Member)
49 p.
Geology; Paleontology
3D Models; Ammonoid Sutures; Photogrammetry; Fossil Digitization

Recommended Citations

Citations

  • Cornelius, C. (2023). Evaluation of Conventional Analog and New Digital Modeling Methods for Describing Ammonoid Suture Patterns [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1683745822743357

    APA Style (7th edition)

  • Cornelius, Camden. Evaluation of Conventional Analog and New Digital Modeling Methods for Describing Ammonoid Suture Patterns. 2023. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1683745822743357.

    MLA Style (8th edition)

  • Cornelius, Camden. "Evaluation of Conventional Analog and New Digital Modeling Methods for Describing Ammonoid Suture Patterns." Master's thesis, Bowling Green State University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1683745822743357

    Chicago Manual of Style (17th edition)

bgsu1683745822743357
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This open access ETD is published by Bowling Green State University and OhioLINK.