Based on the fossil record, ammonites came in a wide range of sizes ... larger chambers separated by thin walls called septa. The animals constantly grew new shell material as they aged, but ...

They were spiral-shelled creatures, closely related to modern ... massive dinosaurs roamed the land. Meanwhile, ammonites thrived in the sea. Their fossils can often be located in various ...

Unlike snails, ammonites coil in one plane and are neither left- nor right-handed. We now know that ammonites were sea creatures with a shell. Much of the original shell of this ammonite from the ...

According to Motani, another extinct aquatic predator that called the North State home was Thalattosaurus, a name that means "sea lizard ... on shelled creatures including ammonites, another ...

Ammonites lived in the sea. If you find an ammonite fossil in a rock, you know that millions of years ago the spot where you’re standing used to be totally underwater. Trilobites are strange-looking ...