Macro photograph of a split fossilized ammonite shell showing the internal mineralized chambers; an extinct marine invertebrate from Madagascar; age: Cretaceous-Albian stage (110 million years ago) Image #3260 6091 X 4080 pixels
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
