When first studied by Leo Lesquereux and John Strong Newberry the Bridge Creek flora was thought to be Miocene age, while Frank Hall Knowlton placed the flora into the Eocene Clarno Formation in 1902.
Acer saccharinum | Acer saccharum | Acer pseudoplatanus | Acer macrophyllum | Acer Inc. | Acer platanoides | Acer rubrum | Acer palmatum | Acer pictum subsp. mono | Norway Maple (''Acer platanoides'') | Manitoba Maple (''Acer negundo'') | Acer sempervirens | Acer heldreichii | ''Acer griseum | Acer davidii | ''Acer'' |