The Eocene Thunder Mountain Flora of Central Idaho, by Axelrod, Daniel
- ISBN: 9780520098237 | 0520098234
- Cover: Paperback
- Copyright: 1/1/1998
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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.