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
Earths' oldest fossils; formed by the activity of microbial mats (particularly cyanobacteria} in limestone-rich shallow waters Image #3765
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
