1. Gravity and Magnetic Methods Presented By: Josh Beckwith Alison Dorsey Janina Stampahar Paul Schwering GPH 492/692 FINAL PROJECT California Wash & Astor Pass, Nevada

2. Gravity Data Acquisition Survey control established with precision theodolite measurements Gravity measured with precision L&R g-meter

3. Magnetic Data Acquisition Utilized two Scintrex precision magnetometers, one stationary base unit, one roving unit Survey control established with hand- held Garmin GPS unit

4. Survey Areas CaliforniaWash Astor Pass

5. California Wash Survey Area To Las Vegas

6. CALIFORNIAWASHCALIFORNIAWASH

7. CALIFORNIAWASHCALIFORNIAWASH

8. Gravity Profile Easting (m)

9. CALIFORNIAWASHCALIFORNIAWASH 65  S=0.0005 S=0.0002

10. Astor Pass ‘ 116°C 550 m Tufa Tower 93°C 94°C 87°C 79°C 90°C 1 km The Needles Astor Pass Tufa Tower Aerial Views Face ~E WE N

11. Regional Geology Map w/ Gravity Contours (from Dr. Jim Faulds) Survey Area

12. Astor Pass Magnetic Data

14. Astor Pass Gravity Data

15. Northing (m)

16. ASTOR PASSASTOR PASS 70  80  85 

17. QUESTIONS?