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Acer dettermani
''Acer dettermani'' is an extinct maple species in the family Sapindaceae described from a series of isolated fossil leaves. The species is known from the late Eocene to early Oligocene sediments exposed in the state of Alaska, USA. It is one of several extinct species placed in the living section ''Macrantha''.
==History and classification==
''Acer dettermani'' is represented by a series of fossil specimens that were recovered from late Eocene to early Oligocene〔 outcrops of the lower Meshik Volcanics, formerly called the Meshik Formation. The rocks were first named in 1929 by R.S. Knappen for material exposed along the Meshik River near Meshik Lake.〔 In 1996 the sequence was reexamined and subsequently renamed the Meshick Volcanics by Robert L. Detterman and a group of researchers, to better reflect the lithology of the rocks.〔 The age of the formation is considered to range from approximately to approximately . The rock section from which the fossils of ''Acer dettermani'' and a number of other plant fossils were recovered is a tuff layer that is exposed on the south flank of Mount Aniakchak's crater.〔〔 Wolfe and Tanai interpreted the floral assemblage of Aniakchak as being a cool mesothermal forest composed of broad-leaf plants.〔
The species was described from a pair of type specimens, the holotype leaf, specimen USNM 396014, and one paratype leaf, specimen USNM 396015. Both of the type specimens are currently preserved in the paleobotanical collections housed at the National Museum of Natural History, part of the Smithsonian Institution in Washington, D.C..〔 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. dettermani'' in the ''Journal of the Faculty of Science, Hokkaido University''.〔 The etymology of the chosen specific name ''dettermani'' is in recognition of Robert L. Detterman for his many contributions to the understanding of the Alaska Peninsula's Tertiary stratigraphy.〔
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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