Ammonite fossil - sliced
This extinct sea creature's septate and geometric form is revealed when cut through the middle with a diamond saw and then polished. This flat specimen is about 12 inches in diameter and for sale in a local rock shop.
The specimen appear to be 3-dimentional but that is an optical illusion produced by the silicate minerals that filled in each septal gap. It becomes a natural trompe l'oel.
Ammonite fossil - sliced
This extinct sea creature's septate and geometric form is revealed when cut through the middle with a diamond saw and then polished. This flat specimen is about 12 inches in diameter and for sale in a local rock shop.
The specimen appear to be 3-dimentional but that is an optical illusion produced by the silicate minerals that filled in each septal gap. It becomes a natural trompe l'oel.