CONTENTS. 
Page. 
Introduction 9 
The Klamath Mountains 9 
Brief summary of events 11 
The Klamath peneplain '_ 15 
Remnants of the Klamath peneplain _ 15 
The Bellspring peneplain 18 
Remnants of the Bellspring peneplain . 19 
The Sherwood peneplain 22 
Profile across Coast Range and Klamath Mountains near fortieth parallel. _ 23 
Elevated 1 >t -aches along seaward border of Klamath peneplain 24 
The coastal plain 24 
North of Rogue River in Oregon 26 
Rogue River to Crescent City, Cal 27 
South of Crescent City, Cal 28 
Marine deposits bordering Klamath peneplain SO 
At Cape Blanco, Oregon 30 
Near Crescent City, Cal 31 
On Mad River 35 
On Eel River— Femdale and Rio Dell 36 
Near Round Valley .. 41 
Fluvio-estuarine deposits < )f Trinity drainage 41 
At Hyampom 41 
At Hay Fork 43 
Redding Creek and Weaverville region 44 
Origin of Klamath and Bellspring peneplains _ . 45 
Age of Klamath peneplain 47 
Dislocation of Miocene deposits of Coast Range and subsequent planation. _ 47 
Orogenic movement initiating Sherwood stage 48 
Orogenic movement initiating Garberville stage 49 
Earlier valleys 49 
Earlier valley of Umpqua River 50 
Earlier valleys of Coos and Coquille rivers 50 
Earlier valleys of Sixes and Elk rivers 51 
Earlier valley of Rogue River 51 
Earlier valley of Klamath River T . 52 
Earlier valleys of Redwood Creek and Mad River 54 
Earlier valley .of Eel River 55 
Earlier valleys of Russian River and Cache Creek 56 
Earlier valley of Stony Creek '_ 56 
Subsidence and earlier valley filling 57 
Uplift and displacement closing earlier valley stage 57 
Post-Miocene elevation '. 57 
GHaciation of later valleys 58 
Subsidence along Oregon coast . _ 59 
Relation of Klamath peneplain to that of Sierra Nevada and Coast Range. . 60 
Relation of topography of Klamath Mountains and Coast Range 61 
Supplement — Notes on geological age of some of the rocks of the Klamath 
Mountains . _ 63 
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