The Eocene Thunder Mountain Flora of Central

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.

Figures, Tables, and Plates

vi

(1)

Acknowledgments

vii

(2)

Abstract

ix

INTRODUCTION

1

(1)

PRESENT ENVIRONMENT

2

(1)

GEOLOGIC OCCURRENCE

3

(1)

Physical Setting

3

(2)

COMPOSITION OF THE FLORA

5

(13)

Dewey Mine Florule

5

(4)

Road Florule

9

(7)

Summary

16

(2)

PALEOENVIRONMENT

18

(9)

Introduction

18

(1)

Precipitation

19

(1)

Temperature

20

(1)

Elevation

21

(5)

Post-Eocene Regional Uplift

26

(1)

FLORISTIC CHANGE

27

(3)

SYSTEMATIC DESCRIPTIONS

30

(27)

Literature Cited

57

(6)

Plates

63

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The Eocene Thunder Mountain Flora of Central Idaho

Summary

Table of Contents

Supplemental Materials