Cladoselache is the first group to evolve that we would recognise as sharks, but they may in fact have been a type of chimaera. ©No bu Tamura/Wikimedia Commons The Carboniferous Period, which began ...

This species is part of a group informally called “chipmunk sharks”, due to their small size and unusual dentition. These ...

These sharks grew to just 3 to 4 inches (7.5 ... which are made up of rocks that have preserved marine sediment from the Carboniferous period (358.9 million to 298.9 million years ago).

Scientists are exploring geological layers dating back to the Carboniferous period, when the region was covered by a ... 3 and 4 inches (8 to 10 cm), earning it the nickname "chipmunk shark." Its ...