CRETACEOUS DEPOSITS OF THE PACIFIC 



COAST. 



BY FRANK M. ANDERSON. 



CONTENTS. 

 Plates I-XII. 



Part I. page. 



I. Introduction 4 



II. Historical Review 6 



III. Purpose of the Paper 10 



IV. Stratigraphy of the Cretaceous. . 12 



1. Basement Complex 12 



2. The Sacramento Valley 14 



3. The Oregon Basin 17 



4. British Columbia 18 



5. Southern Occurrences 20 



6. Correlation 21 



V. Faunal Changes of the Cretaceous 22 



1. Recognized Diversity 22 



2. Horizons Distinguished 24 



The Chico Epoch 24 



The Horsetozvn Epoch 40 



The Paskenta Horizon 43 



The Sub-Knoxville Horizon 47 



VI. Disturbances of the Period 48 



1. Distribution of the Horsetown Beds 48 



2. The Chico-Knoxville Unconformity 50 



3. The Peridotite Intrusions 53 



4. The Chico Overlap 54 



VII. Correlation of Deposits 55 



1. The Sacramento Sections 56 



2. Equivalents of the Chico 56 



3. Equivalents of the Horsetown 63 



4. Equivalents of the Knoxville 65 



5. Cordilleran Oscillations 67 



VIII. Summary and Conclusions 68 



Part II. 



Descriptions of Species 71 



Literature Cited 127 



Index 130 



Explanation of Plates 132 



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