The Miocene Purple Mountain Flora of Western Nevada
In this study, nine florules from the Chloropagus Formation near Fernley, Nevada, are dated at 14.7-13.4 million years. The author finds that dominant mixed conifer forest and sclerophyll woodland species of the Sierra Nevada-Klamath region replaced exotic deciduous hardwoods in the two lowest sites. He concludes that this change reflects the loss of adequate summer rain as upwelling from a colder ocean resulted from spreading East Antarctic ice.
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GEOLOGIC OCCURRENCE AND AGE
COMPOSITION OF THE FLORA
CHANGES IN MIOCENE VEGETATION
Abies abundant Acer allied Alnus Amelanchier Arbutus associated Axelrod Plate beds Betula Brown Calif California Canyon Carnegie Inst cedrusensis Cercocarpus Chamaecyparis Chaney and Axelrod chaneyii changes Chloropagus Formation Chrysolepis climate close Collection cones Creek deciduous desatoyana Descriptions distributed dominated eastern elevation evergreen exotic Family figs florules flows fossil fossil flora four hardwoods Hills Holotype homeotypes hypotypes idahoensis includes indicated Knowlton lake leaves Lithocarpus living localities MacGinitie Mahonia margin mean middle Miocene mixed conifer forest needles Nevada nevadensis numerous occur Picea Pinus plants Populus Populus bonhamii precipitation present probably Prunus Pseudotsuga Purple Mountain flora Pyramid Quercus Range record region relations relatively represent Salix scales sclerophyll seeds Sequoiadendron shrubs similar slopes sonomensis species specimens suggest summer Surv synonymy taxa temperature tertiaries thick thin Truckee River tuffs U.S. Geol UCMP Univ vegetation Wash western Wolfe