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High-frequency Sequences within the Lower Mississippian Allensville Member, Logan Formation, South-central Ohio

Klopfenstein, Trey
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525864536290455

Abstract Details

2018, Master of Science (MS), Ohio University, Geological Sciences (Arts and Sciences).
The Allensville Member of the Logan Formation (Late Tournaisian; 345 – 349 Ma) in south-central Ohio is an anomalously coarse-grained unit deposited in a shallow marine setting at a time when tectonic subsidence rates were low and after the onset of Late Paleozoic glaciations. The Allensville Member mainly consists of interbedded very fine- to very coarse-grained arenites with small amounts of laminated mudstone and coarse-grained laminations in finer-grained sandstones. Less common are well sorted and well rounded, granule to pebble conglomerates. Average grain size is 0.9 mm with a maximum clast size of 3.0 cm. Vertical grain size trends in the measured sections show similar trends of coarsening and fining upwards that can be correlated along strike for 30 km. Fossils within the member consist of crinoid columnal molds and rare brachiopod shell molds. Vertical burrows that are filled with coarse-grained sand and granules from overlying beds and which are present at the same stratigraphic position within each measured section are interpreted as the Glossifungites ichnofacies. The presence of the Glossifungites traces combined with the textures of the sandstones and conglomerates are interpreted to be the result of deposition as storm deposits and transgressive lags, respectively. Vertical changes in grain size, texture, and concentrations of fossils were used to subdivide the interval into systems tracts that represent two 4th order sequences in which deposition was controlled by high-frequency, high magnitude glacio-eustatic sea-level fluctuations.
Gregory Nadon, PhD (Advisor)
95 p.
Geology; Sedimentary Geology
sedimentology; sequence stratigraphy; high-frequency sequences; siliciclastic; ichnology; glacial eustasy; facies model; glossifungites; storm deposit; transgressive lag; shallow marine

Recommended Citations

Citations

  • Klopfenstein, T. (2018). High-frequency Sequences within the Lower Mississippian Allensville Member, Logan Formation, South-central Ohio [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525864536290455

    APA Style (7th edition)

  • Klopfenstein, Trey. High-frequency Sequences within the Lower Mississippian Allensville Member, Logan Formation, South-central Ohio. 2018. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525864536290455.

    MLA Style (8th edition)

  • Klopfenstein, Trey. "High-frequency Sequences within the Lower Mississippian Allensville Member, Logan Formation, South-central Ohio." Master's thesis, Ohio University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525864536290455

    Chicago Manual of Style (17th edition)

ohiou1525864536290455
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This open access ETD is published by Ohio University and OhioLINK.