My undergraduate honours project examined the use of lithified raindrop imprints in determining atmospheric pressure at the time of crater formation. This is based on the atmospheric density dependent terminal velocity of falling drops and it expands on the work of Som et al. (2012) and Lyell (1851).
This was an exciting project conducted under the supervision of Dr. Colin Goldblatt. I am happy to provide a copy of my thesis upon request and my results are presented in the journal Earth and Planetary Science Letters (pdf also available upon request).