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The Geology and Petrography of Crater Lake National Park, 1902

 

Table of Contents.

Complete Report (HTML)

Complete Report (PDF)

 

Cover

Introduction

Routes to Crater Lake

Excursions About Crater Lake


Learn more about the Geology of Crater Lake National Park through articles, books, images, news, and more


Part I.

Introduction

Cascade Range

Limits

Foundation

Eocene history

Miocene history

Union Peak

Mount Thielsen

Mount Mazama

General features

Lavas

Andesites

Watchman area

Castle Creek area

Munson Point area

Union Peak area

Eagle Crags area

Dutton Cliff area

Sentinel Rock area

Round Top area

Steel Bay area

Wizard Island

Andesitic dikes

Basalts

Timber Crater flow

Desert Cone and Red Cone flows

Bald Crater flow

Crater Peak flow

Other flows

Dacites

Sun Creek flow

Cloud Cap flow

Grouse Hill flow

Llao Rock flow

Wineglass flow

Cleetwood Cove flow

Dacitic dikes

Dacitic pumice

Glaciation

Original condition

Development

Destruction of Mount Mazama and formation of the caldera

Crater Lake

Temperature

Changes of water level

Evaporation

Inflow

Outlet

 

PART II.

Hypersthene-andesites

Mineral components

Plagioclase

Pyroxene

Hypersthene

Augite

Accessory minerals

Classification of andesites

Hyalopilitic type

Hypocrystalline type

Subtype A

Subtype B

Holocrystalline type

Dacitic type

Uncertain types

Andesite dikes

Chemical analyses

Secretions in andesites

Hypersthene—dacites

Mineral components

Feldspar

Hornblende

Hypersthene

Augite

Other minerals

Distribution and description of dacite masses

Llao Rock flow

Vitrophyric dacite

Lithoidal dacite

Spherulitic dacite

Nodular secretions

Grouse Hill flow

Cleetwood Cove flow

Wineglass flow

Cloud Cap flow

Sun Creek flow

Dacite tuff

Dacite dikes

Dacitic ejectamenta

Pumice

Dark-colored secretions

Light-colored granophyric secretions

Secretions with basalt-like structure

Chemical analyses

Basalts

Interstitial basalts

Mineral components

Feldspar

Augite

Hypersthene

Olivine

Magnetite

Hypersthene, apatite, and pseudobrookite crystals

Apatite

Hypersthene

Pseudobrookite

Fluidal-interstitial

Porphyritic-interstitial basalts

Andesitic basalts

Type A

Type B

Type C

Type D

Chemical analyses

Concluding remarks on the basalts

Table of thin sections, with new and old numbers

 

 

 

 

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