Author : Daniel I. Axelrod
Publisher : Univ of California Press
Page : 120 pages
File Size : 41,4 MB
Release : 1995-01-01
Category : Science
ISBN : 9780520097971
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.
Author : Daniel I. Axelrod
Publisher : Univ of California Press
Page : 164 pages
File Size : 49,47 MB
Release : 1998-07-31
Category : History
ISBN : 9780520098244
This flora of 70 species is dominated by deciduous trees, many with descendants in China. Precipitation was 890 mm, mean annual temperature 12.5°C, the annual range 10°C, and freezing rare. Elevation was about 1000 meters. Comparison with the Horse Prairie flora, 30 miles east and across the present continental divide, indicates that the divide was then low and discontinuous, with warmer climate to the east.
Author : Daniel I. Axelrod
Publisher : Univ of California Press
Page : 108 pages
File Size : 17,82 MB
Release : 1998-03-17
Category : Nature
ISBN : 9780520098237
An Eocene (45 Ma) flora from Thunder Mountain caldera shows that montane conifer forest species from upper slopes descended to interfinger with mixed conifer-deciduous hardwood forest on the caldera floor then near 1700 m. Most species are allied to those in the western United States, but a few genera are in China. Precipitation was near 100 cm yearly, with most in summer.
Author : J. van der Burgh
Publisher : Alexander Doweld
Page : 167 pages
File Size : 33,93 MB
Release : 2006
Category : Angiosperms
ISBN : 9057821842
Author :
Publisher : Alexander Doweld
Page : 147 pages
File Size : 23,94 MB
Release : 2005
Category :
ISBN : 9057821613
Author : Daniel I. Axelrod
Publisher : Univ of California Press
Page : 68 pages
File Size : 17,35 MB
Release : 2000-06-12
Category : Science
ISBN : 9780520915992
This is a study of the Miocene Carmel flora of California, an evergreen laurel–oak forest that grew in a mild temperate (mean annual temperature of 15 degrees C), frost-free climate, with annual precipitation of about 760 mm (30 in.). Collectively, the Carmel and other Miocene floras like the San Pablo and Temblor (broad-leafed deciduous trees, with few evergreen species), the Puente (evergreen oak forest with chaparral species), the Mint Canyon, Ricardo, and Tehachapi (numerous arid subtropical scrub associated with oak woodland and chaparral species) suggest they foreshadowed a similar distribution of the different California vegetation zones today.
Author : Zehao Shen
Publisher : Frontiers Media SA
Page : 144 pages
File Size : 20,71 MB
Release : 2021-07-27
Category : Science
ISBN : 2889710807
Author : L. Barry Albright III
Publisher : Univ of California Press
Page : 160 pages
File Size : 15,29 MB
Release : 2000-03-08
Category : Science
ISBN : 9780520915985
The author describes forty-two fossil taxa recovered during a study of the San Timoteo Badlands that used magnetobiostratigraphy to develop a temporal framework for addressing the tectonic evolution of southern California over the last 6 million years. For the Pliocene, small mammals are an effective means of correlating a magnetostratigraphy to the Geomagnetic Polarity Time Scale when radioisotopic dates are unobtainable.
Author :
Publisher : Alexander Doweld
Page : 134 pages
File Size : 26,55 MB
Release :
Category : Paleobotany
ISBN :
Author : Joseph V. Tingley
Publisher : NV Bureau of Mines & Geology
Page : 102 pages
File Size : 28,87 MB
Release : 1999
Category : Mines and mineral resources
ISBN :
