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Acer latahense
''Acer latahense'' is an extinct maple species in the family Sapindaceae described from series of isolated fossil leaves. The species is known from the latest early to middle Miocene sediments exposed in the states of Oregon and Washington, USA. It is one of several extinct species placed in the living section ''Macrantha''.
==History and classification==
''Acer latahense'' is represented by a group of fossil specimens from three different geologic formations. Three of the leaves were recovered from the early Miocene to late Miocene aged outcrops of the Latah Formation near Spokane in Washington state. Another leaf is from the similarly aged Mascall formation near Tipton, Oregon, while the last fossil is from the middle Miocene age Succor Creek Formation near Nyssa, Oregon. Both the Latah and Mascall Formations are composed of temporary lake beds which are interbedded with lava flows belonging to the Columbia River Basalt Group.〔〔 While the very similar floral composition of the two formations has resulted in both occasionally being termed the Latah Flora, currently the Mascall and Latah are considered separate though coeval formations.〔
The type specimens for ''Acer latahense'' are located in three different repositories. The holotype leaf type specimen, a part and counterpart numbered USNM 396136A, B, and two paratype leaves are currently preserved in the paleobotanical collections housed in the National Museum of Natural History, part of the Smithsonian.〔 One other paratype leaf is housed at the University of California Museum of Paleontology in Berkeley, California, while the last paratype leaf is part of the University of Michigan Museum of Paleontology collections in Ann Arbor, Michigan.〔 The specimens were studied by paleobotanists Jack A. Wolfe of the United States Geological Survey, Denver office and Toshimasa Tanai of Hokkaido University. Wolfe and Tanai published their 1987 type description for ''A. latahense'' in the ''Journal of the Faculty of Science, Hokkaido University''.〔 The etymology of the chosen specific name ''latahense'' is in recognition of the type location for the species at the "Brickyard site" outcrop, part of the Latah Formation in Washington State.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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