Orthoceras were subject to two
distinctly separate extinctions. The
first was was during the Ordovician period in the Triassic era, 488 to 443 million years ago. The second
and final extinction during the Devonian period of the Peleozoic era, 416 to 359 million years ago.
Overall this spans a total of 129 million
years so the Orthoceras was a
spectacularly successful animal in terms
of its survival and its ability to adapt.
High quality fossil Orthoceras specimens
are found in many parts of the world
which indicates how widespread their
populations were when they thrived
across the worlds oceans.
In