Paleogeographic setting of Pennsylvanian Tyler formation and relation to underlying Mississippian rocks in Montana and North Dakota

Journal Article · Wed Feb 01 00:00:00 EST 1984 · AAPG Bull.; (United States)

OSTI ID:6360034

Maughan, E K

Pennsylvanian sedimentary rocks in the northern Rocky Mountains and in the northern Great Plains of the United States were deposited primarily on a broad marine shelf between the North American craton and the late Paleozoic continental margin in Idaho and adjacent states. The Lower Pennsylvanian (Morrowan) Tyler Formation comprises detrital sediments and some limestone beds in Montana and North Dakota that were deposited along an eastward-transgressing marine shoreline after regional uplift, warping, and faulting had resulted in an erosional unconformity on top of Mississippian strata. The Lower Pennsylvanian shoreline finally extended onto the cratonic interior in eastern North Dakota. Initial Tyler sediments were deposited as a deltaic and fluviolacustrine complex succeeded by littoral deposits as the Early Pennsylvanian shoreline transgressed eastward across the shelf. The Tyler Formation is subdivided into the Stonehouse Canyon Member at the base, the Bear Gulch Member, and the Cameron Creek Member at the top.

• Research Organization: U.S. Geological Survey, Denver, CO
• OSTI ID: 6360034
• Journal Information: AAPG Bull.; (United States), Vol. 68:2
• Country of Publication: United States
• Language: English

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