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Acer hillsi
''Acer hillsi'' is an extinct maple species in the family Sapindaceae described from a single fossil samara. The species is solely known from the Early Eocene sediments exposed in south central British Columbia, Canada adjacent to northeast Washington State, USA. It is one of only two species belonging to the extinct section ''Stewarta''.
==Taxonomy==
''Acer hillsi'' is known from one single specimen which was recovered from the Burke Museum of Natural History and Culture location UWBM A0307, an outcrop of the early Eocene, Ypresian〔 Klondike Mountain Formation in Republic. The UWBM A0307 site is known as the "Corner lot" locality. The section ''Stewarta'' is known only from ''A. hillsi'' and the related species ''A. stewarti'' described from the Ypresian Allenby Formation exposed near Princeton, British Columbia.〔〔 Both the Allenby and Klondike Mountain Formations preserve upland temperate floras which were first interpreted as being microthermal,〔 however further study has shown them to be more mesothermal in nature. The plant community preserved in the Klondike Mountain formation is a mixed conifer–broadleaf forest with large pollen elements of birch and golden larch, but also having notable traces of fir, spruce, cypress, and palm. The Allenby formation is similar with the birch and golden larch as strong pollen signals and traces of fir and spruce, however the cypress and palm are not distinct signals.〔 The species were known only from the Republic and Princeton fossil localities respectively when first described. Of the two species, ''A. hillsi'' is only known from the samara fossils while ''A. stewarti'' has been described from both leaves and samaras.〔 The two are among a number of ''Acer'' species described from the Republic and Princeton sites by Wolfe and Tanai.〔
The species was described from a solitary type specimen, the holotype samara, number UWBM 56260 A, B, which is currently preserved in the paleobotanical collections housed at the Burke Museum, part of the University of Washington in Seattle.〔 The specimen was 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. hillsi'' in the ''Journal of the Faculty of Science, Hokkaido University''.〔 The etymology of the chosen specific name ''hillsi'' is in recognition L. V. Hills who allowed Wolf and Tanai access to his extensive fossil collection and for his contributions to paleobotany and palynology.〔
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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