1. Briefly interpret the contact in red indicated by the arrows in the sketch at right. What kind of contact is this, and what are the relative age constraints on when it formed?
2. Briefly indicate the most likely interpretation of the red contact indicated by the arrows in the sketch at right. What kind of contact is this, and what are the constraints on when it formed?
The image at right is part of Grady Konzen’s structure contour map on the top “Big Injun” formation along the Ohio River east of Marietta. The reds represent higher elevations, the yellows and greens lower. Briefly describe and interpret this structure, including the type of fold illustrated, the type of fault illustrated, and the significance of the offset fold hingeline (i.e., is this a cutoff or a piercing point, and what is the significance of that distinction?)
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