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Sedimentology and Stratigraphy of the Lower Jurassic Portland Formation, Newark Supergroup, Hartford Basin

Zerezghi, Simret Ghirmay

Abstract Details

2007, Master of Science (MS), Ohio University, Geological Sciences (Arts and Sciences).
The Triassic-Jurassic rift system in eastern North America was formed by the breakup of Pangea. The sedimentary fill and lava flows of these rift basins are collectively known as the Newark Supergroup. The Hartford basin is divided into four sedimentary formations interbedded with three basaltic flows. The Portland Formation is the youngest (Sinemurian-Toarcian) and exposed in the eastern half of the basin. Finergrained facies in the central portion of the basin now can be accessed with cores recovered from the city of Hartford. This study is based on 20 out of 35 drilled cores with approximately 600 m of the lowermost Portland Formation measured and correlated. Facies include: (1) black shale (Fl1), (2) ripple cross-laminated black mudrock (Fr1), (3) disrupted black mudrock (Fm1), (4) stratified red mudrock (Fl2), (5) ripple crosslaminated red mudrock (Fr2), (6) disrupted to massive red mudrock (Fm2), (7) ripple cross-laminated to trough cross-bedded sandstone (Srt), and (8) horizontally bedded sandstone (Sh). Three main depositional settings are interpreted: alluvial plain to sandflat (Fr2, Fm, Sh, Srt), shallow lake to playa (Fl2, Fm), and offshore perennial saline lakes with deltaic sheets (Fl1. Fr1, Fm1, Sh). Fourteen lake cycles were recognized, controlled by both tectonics and climate, influencing the evolution of the lake systems.
Elizabeth Gierlowski-Kordesch (Advisor)
102 p.

Recommended Citations

Citations

  • Zerezghi, S. G. (2007). Sedimentology and Stratigraphy of the Lower Jurassic Portland Formation, Newark Supergroup, Hartford Basin [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1181233653

    APA Style (7th edition)

  • Zerezghi, Simret. Sedimentology and Stratigraphy of the Lower Jurassic Portland Formation, Newark Supergroup, Hartford Basin. 2007. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1181233653.

    MLA Style (8th edition)

  • Zerezghi, Simret. "Sedimentology and Stratigraphy of the Lower Jurassic Portland Formation, Newark Supergroup, Hartford Basin." Master's thesis, Ohio University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1181233653

    Chicago Manual of Style (17th edition)