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
Macro photograph of a cross-sectioned dinosaur bone showing the interior cellular structure (unidentified Sauropod from the late Jurrasic period (150 million yrs ago)); Colorado Image #3334 4800 X 3200 pixels
Polished rock containing ammonite fossils in various degrees of fragmentation; also known as Marston Magna Marble; approx. 200 million yrs old (Lower Jurassic) mined in Somerset, England Image #3365 3098 X 4766 pixels
