57.7 MB (6.6 MB compressed)
3888 x 5184 pixels
33.0 x 43.9 cm ⏐ 13.0 x 17.3 in (300dpi)
SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Coiled and heteromorph ammonites. The heteromorph ammonite is in the background, with a planospirally coiled ammonite in the foreground. Ammonites were marine invertebrate molluscs that formed a spiral chambered shell, with the ammonite living in the newest and largest chamber. Shells ranged in width from under 1 centimetre to over 1 metre. Ammonites first appear in the fossil record around 400 million years ago and became extinct at the end of the Cretaceous period 65 million years ago.
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