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Date of Graduation
Bachelor of Science (BS)
Department of Geology and Environmental Science
Stephen A. Leslie
Conodont species, CAI and lithofacies analysis are used as methods of correlation to determine the relative age, depositional environment, and post depositional burial history of the Edinburg Formation in central Virginia. Samples collected for conodont microfossils yielded faunas of Baltoniodus sp. or Amorphognathus sp., Periodon grandis and Protopanderodus liripipus from a site near Luray and Drepanoistodus suberectus, Plectodina sp., Protopanderodus liripipus, Oistodus sp., Phragmodus undatus, Erismodus radicans and Panderodus gracilis from a site in Harrisonburg. The species supports a Late Ordovician (Late Sandbian age). Conodonts from both sites have a CAI of 4-5, indicating post-depositional heating of over 300 degrees C and suggesting burial depts of over 13-15 km, which is consistent with the ductile folding obvious in the Luray area site. Sample lithologies are consistent with published lithofacies maps, and support deposition in a deep-shelf setting.
Showalter, Lauren, "Determining biostratigraphy and correlation using color alteration index and lithofacies of conodonts in the Edinburg Formation, Central Virginia" (2021). Senior Honors Projects, 2020-current. 109.