re: The post I was hoping for:
Vesicles had been seen in Viking rocks. The usual interpretation is that they are analogous to the holes in pumice rock, due to gas release.
However, some proponents of life on Mars suggest they are due to ancient life on Mars:
The Need For Mars Mission Exobiologists
by Barry E. DiGregorio
Middleport - July 16, 2000.
http://www.spacedaily.com/news/mars-life-00e.html
Bob Clark
