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Acer cascadense is an extinct maple species in the family Sapindaceae described from a series of isolated fossil samaras. The species is known from fossils found in Middle Miocene deposits of central Oregon. It is one of several extinct species placed in the living Acer section Negundo.
Acer cascadense fossils were found in the Moose Mountain Flora, formerly called the Cascadia flora or Menagerie Wilderness flora, of Linn County, Oregon. The flora is included in the Little Butte Volcanic series outcropping near the town of Cascadia in the central Oregon Cascades. Work on the flora by paleobotanist Jack Wolfe in 1964 gave an estimated age of Early Miocene, this was later revised by Wolfe and Tanai in 1987 to a Late Oligocene estimation. In the descriptive paper naming T. postnastae Manchester et al reported that radioisotope dating of plagioclase crystals collected by Robert Rosé from the fossiliferous horizon of the Moose Mountain flora had been performed. Using crystals obtained from tuffaceous sandstones, Argon–argon dating provided an age of 14.91 ± 0.23 Ma placing the flora as Middle Miocene Langhian stage. Acer cascadense is found associated with extinct species including A. smileyi, Concavistylon kvacekii, Ozakia emryi, Trochodendron postnastae, and Trochodendron rosayi.
Tapering Leaf Maple · Acer alaskense · Himalayan Maple · Acer amamiense · Broad Maple · Deep-veined Maple · Acer ashwilli · Bearded maple · Jalisco Maple · Acer brevipes · Acer browni · Trident maple
Text excerpted from the Wikipedia article Acer cascadense by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
