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- W786322590 abstract "Devonian and Mississippian sedimentary rocks of western Montana and east-central Idaho were deposited on a cratonic platform that faced a deep basin to the west. The deep basin in Idaho probably was a northern extension of the Antler foredeep and formed as a flexural response to loading of the ancient North American continental margin by an inferred arc and thrust belt complex. Evidence for the arc and thrust belt complex is especially ambiguous in Idaho. In order to document the timing of possible Antler convergence events, quantitative subsidence analyses were done on Devonian-Mississippian strata in Montana and Idaho. The subsidence analyses indicate that episodic subsidence events in the proximal foredeep also affected the adjacent cratonic platform, an area approximately 800 km wide (palinspastic). Isopach maps for this sequence illustrate that many depocenters and paleohighs were geographically coincident across the foreland through time. Some of these structures were tectonically inverted (i.e., paleohighs became depocenters and vice versa) during the 50-60 million years represented by this stratigraphic sequence. Many of these paleostructures were oriented at high angles to the north-south trending axis of the Antler foredeep and the inferred strike of the Antler orogenic belt. These foreland structures coincide geographically with structural trends produced during Proterozoic extension, suggesting that the Proterozoic faults were reactivated during Antler convergence." @default.
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- W786322590 date "1991-01-01" @default.
- W786322590 modified "2023-09-23" @default.
- W786322590 title "Antler Foreland Stratigraphy of Montana and Idaho: The Stratigraphic Record of Eustatic Fluctuations and Episodic Tectonic Events" @default.
- W786322590 hasPublicationYear "1991" @default.
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