Primordial oil slick.
Calculations and some preliminary experiments suggest that an early methane atmosphere would have been polymerized by solar ultraviolet radiation in geologically short periods of time. An oil slick 1 to 10 meters thick could have been produced in this way and might well have been of considerable importance in the development of life.
Lasaga
A C
AC
Holland
H D
HD
Dwyer
M J
MJ