CONTENTS. 



Page. 



Letter of transmittal 7 



Introduction 9 



Geographic location and topographic features 10 



History of exploration in the John Day Basin 11 



Geological features of the John Day Basin 14 



History of geological investigation in the region 11 



Pre-Cretaceous rocks 16 



Knoxville and Chico beds 17 



Clarno formation 17 



John Day series 18 



Columbia River lava 19 



Mascall formation 19 



Rattlesnake formation 19 



River terraces 20 



Localities for fossil jilants in the John Day Basin 20 



Systematic description of species 21 



•Species excluded from this work 87 



List of synonyms 88 



Discussion of the flora 89 



Statistical view 89 



Table showing distribution of species 89 



Biological considerations 93 



Geological considerations 102 



Lower Clarno 1 )eds 102 



Cherry Creek 102 



Table showing extralimital distribution of fossil plants from 



Cherry Creek locality 103 



Upper Clarno beds 103 



Bridge Creek 103 



Table sliowing extralimital distriljution of fosi^il plants from 



Bridge Creek locality 104 



Other localities 105 



Mascall l)eds 106 



Van Horn's ranch and vici nity 106 



Table showing extralimital distribution of fossil plants from 



Van Horn's ranch and vicinity 109 



The flora of the John Da}' Basin in other localities 109 



The Dalles, Oregon 112 



Summary 112 



riates 115 



Index 151 



3 



