The Oligocene Bridge Creek Flora of the John Day Formation, Oregon (University of California Publications in Geological Sciences)

ISBN: 9780520098169

出版社: University of California Press

出版年: 1998-02-02

页数: 364

定价: USD 50.00

装帧: Paperback

内容简介

This comprehensive systematic revision of the Bridge Creek flora is based on large collections of megafossil specimens from the John Day and Crooked River basins. The flora was found to be more diverse than previously recognized, with at least 125 species. At least 11 genera are extinct, but the majority are extant members of deciduous forests. The flora was derived from a variety of sources and represents a classic example of the broadleaved deciduous forests that became widespread at mid-latitudes following the Eocene-Oligocene climatic cooling.