Kaibab Faults Interpreted

There are two fault sets here, one dipping to the left and with larger offsets, and smaller ones dipping to the right. In this cross section view both appear as normal faults, and are roughly 60 degrees from each other. This pattern, of two faults sets that form roughly at the same time and are at 60 degrees to each other is very common. Together they are a conjugate pair, and it is also common that one set dominates (the synthetic set) while the other is subordinate (the antithetic set). More on why this pattern is so common later in the course. Note also that the joint set here roughly parallels the fault planes, and a parsimonious explanation is that they formed together. The tilting of the layers next to the fault is also fairly common (more on this later also).

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