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Acer ivanofense
''Acer ivanofense'' is an extinct maple species in the family Sapindaceae described from series of isolated fossil leaves. The species was described from Eocene to Oligocene aged fossils found in the United States of America. It is one of several extinct species placed in the living section ''Glabra''.
==History and classification==
''Acer ivanofense'' is represented by a group of fossil specimens recovered from late Eocene to early Oligocene〔 outcrops of the lower Meshik Volcanics, formerly called the Meshik Formation, at US Geological Survey site 11418 on Road Island, Ivanof Bay on the Alaska Peninsula. 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 species is known from the holotype specimen, USNM 396017a, and three other specimens, USNM 396017b, USNM 396017c, and USNM 396017d.〔 All four specimens are preserved in the collections of the National Museum of Natural History. 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. ivanofense'' in the ''Journal of the Faculty of Science, Hokkaido University''. The etymology of the chosen specific name ''ivanofense'' is in recognition of the type location for the species in Ivanof Bay, Alaska.〔
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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