Earths' oldest fossils; formed by the activity of microbial mats (particularly cyanobacteria} in limestone-rich shallow waters Image #3765 4699 X 5797 pixels
Cross section of a piece of agatized fossilized coral; Miocene in age (25-32 million years); from the west coast of Florida Image #3137
Macro photograph of a sliced Goniatite fossil showing the interior chambered structure of the shell; Goniatites are an extinct ammonoid cephalopod, Devonian in age (approx. 400 million yrs old); this from the Atlas Mountains in Morocco Image #3118 4080 X 5380 pixels
