Sharks first inhabited the waters during this period of the Paleozoic era named for an English county
[DOC] [TLE] Devonian - Wikipedia [PAR] The Devonian is a geologic period and system of the Paleozoic Era, spanning 60 
million years from the end of the Silurian Period, about 419.2 million years ago (
Mya), to the beginning of the Carboniferous Period, about 358.9 Mya.