Figure F4. In each pair, the left panel is an example of a silty claystone (gray) and sandstone (yellow) formation, and the right panel is the theoretical fraction of silty claystone (gray) and sandstone (yellow) from cuttings for the same formation, assuming cuttings are produced only by the 12¼ inch bit and the 20 inch underreamer. A. Silty claystone and sandstone. B. Sandstone bed (50 m thick) bounded by silty claystone. C. Sandstone bed (15 m thick) bounded by silty claystone.
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