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Compaction, especially for shales, is readily estimated. Normal shale, and perhaps limestone, has a solidity (S; the complement of porosity) within 5% of the Baldwin-Butler power-law equation,
burial depth (in km) = 6.02 S6.35.
Shales at least 200-m (660-ft) thick should fit the Dickinson curve, or our "Dickinson equation,"
burial depth (in km) = 15 S8.
For sandstones, the Sclater-Christie exponential curve seems satisfactory. Its logarithmic equivalent is,
burial depth (in km) = 3.7 ^scrln[0.49/(1 - S)].
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