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The sediments of the Middle Devonian of the eastern United States form a great wedge with its thickest part in eastern New York and adjacent New Jersey. The wedge represents the filling of a great geosyncline; the feather edge of the wedge lies far to the west in Arkansas. Sedimentation was not continuous in the Midwest where di conformities occur. The lack of continuity of the sediments is a reflection of regional uplifts in all parts of the basin and margining lands; the minor breaks may be a reflection of climatic fluctuations.

The sediments composing this wedge consist of red...

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