Oronto Group: a petroliferous rift-fill sequence of the Mid-Continent rift system
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:5378745
The Oronto Group of northern Michigan and Wisconsin includes the Copper Harbor Conglomerate, Nonesuch Formation, and Freda sandstone. These formations are part of a volcaniclastic sequence created in response to the formation of the Mid-Continent rift system. Although intercalated volcanics are found in the lower one-third of the Oronto Group, a sedimentary depositional regime was dominant. Although complex in detail, an overall depositional model for the Oronto Group is one of relatively simple transgressive-regressive relationships between alluvial, lacustrine, and fluvial environments. Important aspects of such a model include (1) all Oronto Group formations are genetically related; (2) the intervening Nonesuch Formation is, at least in part, equivalent in age to the upper Copper Harbor and the lower Freda; and (3) such rift settings can have significant hydrocarbon potential.
- Research Organization:
- Placid Oil Co., Dallas, TX
- OSTI ID:
- 5378745
- Report Number(s):
- CONF-860624-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:5
- Country of Publication:
- United States
- Language:
- English
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