Study: These ancient straight-shelled cephalopods lived the vertical life

Enlarge / Reconstruction of the orthocone ammonite Baculites compressus . A new study reveals that the creatures likely lived a vertically oriented lifestyle. (credit: David Peterman) The fossil record is chock-full of the fossilized remains of spiral-shelled ammonoids , whose shapes are reminiscent of rams’ horns. But there was another type of ammonoid with long, […]