Discussion
A formation thickening from 20 m to 60 m over 10 km has isopachytes whose spacing represents a thickness change of
Answer: D
Correct answer: 4 m per kilometre
\[ \frac{60 - 20}{10} = 4\ \mathrm{m\ per\ km}. \] So an isopachyte drawn at every 4 m of thickness would fall a kilometre apart. A steady thickening of this kind usually indicates a basin subsiding faster in one direction while deposition kept pace.
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