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Figure F28. Logging stratigraphy. A. Hole shape, total spectral gamma ray, and potassium content. B. Thorium and uranium. C. Deep, medium, and shallow resistivities. D. Porosity and bulk density. E. Capture cross-section (SIGF) and photoelectric effect factor (PEF). F. Downhole compressional velocities. (N.B., jumps to higher values in Units 2 and 3 are invalid data.) G. Logging units.

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