Adjective
paleoenvironmental (not comparable)
(geology) Of or pertaining to the environment at a particular time in the geologic past.
Nanometer-Scale Layering in Rock Varnish: Implications for Genesis and Paleoenvironmental Interpretation, The Journal of Geology, 103(1): 106-113 Rock rust and desert patina are other terms which are also used for the condition, but less often. Source: Internet