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Acer browni
''Acer browni'' is an extinct maple species in the family Sapindaceae described from a series of isolated fossil leaves and samaras. The species is known from the early to middle Miocene sediments exposed in Western Oregon, Washington state, USA and Northern Graham Island, Haida Gwaii, Canada. It is one of several extinct species placed in the living section ''Parviflora''.
==History and classification==
The eleven leaf specimens used to describe ''Acer browni'' were recovered from five different sites. The largest group of specimens was recovered from the early Miocene, Aquitanian, Collawash site exposed near the Collawash River in Clackamas County Oregon.〔 Two additional paratype leaves were recovered from outcrops of the Latah Formation at the Vera site near Veradale, Washington. Another Washington site, on Bunker Creek〔 west of Centralia, Washington produced one paratype leaf of middle Miocene〔 age. The last paratype leaf is from the species' northernmost location, having been recovered from an outcrop of the late early Miocene Skonun Formation on the northern side of Graham Island in the Haida Gwaii of British Columbia.〔 In addition to the leaf specimens a series of paratype specimens were described for the associated samaras recovered at the Collawash site and United States Geological Survey site USGS 8904 near the Little Butte Creek in Jackson County, Oregon.〔
The type specimens for ''Acer browni'' are placed into three different repositories. The holotype leaf and thirteen of the paratypes are currently preserved in the paleobotanical collections housed at the University of California Museum of Paleontology, in Berkeley, California. Three other paratype leaves and one paratype samara are housed in the National Museum of Natural History, part of the Smithsonian while the last paratype leaf is part of the University of British Columbia collections in Vancouver, British Columbia.〔 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. browni'' in the ''Journal of the Faculty of Science, Hokkaido University''.〔 The etymology of the chosen specific name ''browni'' is in recognition of paleobotanist Roland Wilbur Brown for his many contributions to Tertiary paleobotany.〔
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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