. . "5298"^^ . . . . . . . . . . . . . . . . . . . . . . . "1018355523"^^ . . . . . . . . . . . . . . . . . . . . . . . . "Corylus johnsonii is an extinct species of hazel known from fossil fruits found in the Klondike Mountain Formation deposits of northern Washington state, dated to the early Eocene Ypresian stage (56 to 48 million years ago). Based on described features, C. johnsonii is the oldest definite species in the genus Corylus."@en . . "Corylus johnsonii is an extinct species of hazel known from fossil fruits found in the Klondike Mountain Formation deposits of northern Washington state, dated to the early Eocene Ypresian stage (56 to 48 million years ago). Based on described features, C. johnsonii is the oldest definite species in the genus Corylus."@en . . . . . "Corylus"@en . . . . . . . . . . "Corylus johnsonii holotype specimen"@en . . "yes"@en . . . . . . . . "28254321"^^ . "Corylus johnsonii"@en . . . . "johnsonii"@en . . . .