Question

Which of the following sedimentary feature(s) indicate(s) sub-aerial exposure of the depositional surface?

• A. Groove cast
• B. Double mud drape
• C. Rain print
• D. Adhesion ripple

Hint:

Features like rain prints and adhesion ripples are formed when a sedimentary surface is exposed to the atmosphere, typically indicating sub-aerial conditions.

Answer 1

The Correct Option is C, D

Sub-aerial exposure refers to the exposure of the surface to the atmosphere, typically through drying or other weathering processes. The following features indicate sub-aerial exposure:
- Rain prints (option C) are surface impressions formed when raindrops land on a soft sedimentary surface, indicating sub-aerial exposure.
- Adhesion ripples (option D) are ripples formed by the interaction of water and a surface under sub-aerial conditions, showing signs of atmospheric exposure.
Thus, the correct answer is (C) and (D).