Chapters

1. Introduction

• Geologic Setting and Previous Work

2. Basalt Flow Stratigraphy

• Grande Ronde Flows
• Post-Grande Ronde Flows
• Feeder Dikes

3. Structure

• Faults Coincident with the Olympic-Wallowa Lineament
• The Hite Fault System
• Blue Mountains Uplift
• Graben Related Faults
• Shallowly Dipping Faults
• Wanapum Basalt Feeder Dikes
• Interaction Between the Major Fault Systems
• Discussion

4. Conclusions

References

Appendices

A. Descriptions of the five principal stratigraphic sections

B. Chemical analyses by XRF of basalt flows and dikes

C. Slickenside and fault plane data

D. Procedure for field use of the portable fluxgate magnetometer

E. Road log for Tiger Creek Road with fault outcrop descriptions

F. Fault outcrop descriptions for Maps 3 and 4

Abstract of poster presentation derived from this thesis

Complete contents of poster presentation derived from this thesis

Sample location maps

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Figure 22

Sketch of the northwest trending faults in a road cut at location 8 along Tiger Creek Road viewed facing N30oW (Map 2). Vertical offset on the main, covered fault is about 6 meters down to the east. Immediately to the southeast, below the road, this offset is clearly visible. Offset on the exposed minor fault which has poorly developed near vertical slickensides and grooves is about 10 cm down to the west. The thin flow labeled unit 27 is the uppermost Grande Ronde reversed polarity flow in the Tiger Creek area.