Permian
Concise Oxford English Dictionary © 2008 Oxford University Press:
Permian /ˈpəːmɪən/
▶adjective Geology relating to or denoting the last period of the Palaeozoic era (between the Carboniferous and Triassic periods, about 290 to 245 million years ago), a time when reptiles proliferated and many marine animals became extinct.
– origin C16: from Perm, a Russian province with extensive deposits from this period.
'Permian' also found in these Oxford entries:
