An extinct marine invertebrate found in Madagascar; existed during the Middle Cretaceous period approx. 110 million years ago. Image #1768
Petrified swamp/bog bottom/mud from Nevada; known as Gary Green jasper or larsonite Image #3593
Macro photograph of patterns and colors in a piece of petrified wood (Woodworthia species) from the Chinle Formation in Arizona; approx. 225 million years old Image #2612
