Protoclepsydrops was an early amniote from about 314 million years ago. Its remains were found at the Joggins Fossil Cliffs World Heritage Site. The dating of this site has been debated, with dates from 320 million years ago (mya) to 305 mya being suggested. It is now settled as 314.5–313.4 mya +/- 1.1 million years.