EVA-17 Report
Kyoichi Sasazawa Reporting

Duration: 14:57-17:08 2 hours 11 minutes

Participants: Digby Tarvin (commander), Celeste Gale, Kyoichi Sasazawa

Equipment: ATV, camera, rock hammer, GPS, reflector, and map with waypoints

Route: in UTM

• Hab (0158.170E 4250.93N) to 0518.35E 4249.27N (Wpt 134)
• Wpt 134 to 0518.90E 4248.70N (Wpt 135)
• Wpt 135 to 0519.94E 4248.05N (Wpt 136)
• Wpt 136 to 0520.56E 4248.60N (Wpt 137)
• Wpt 137 to Hab

Objectives/Work Done: The purpose of this EVA was to explore White Rock Canyon which exposes an upper part of the upper Jurassic Morrison Formation. We confirmed an upper sequence of the Morrison Formation at Wpt 137. We found that the trail from Wpt 136 to 137 no longer exists. Additionally we tried to find a fossil shell impression at Wpt 135, which a past crew mentioned in their report. However we couldn't find it because their waypoint is not consistent with the appropriate outcrop.

Weather: Clear, 48-52F

Maximum distance from Hab: 3.4km

Lessons Learned:

1. Trails shown on the map do not always exist.
2. We should check not only UTM, but also contour lines on the map. UTM sometimes shows large errors.

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EVA 18 Report
Louise Wynn Reporting

Duration: 2 hours, 24 minutes

Participants: Bob McNally, Louise Wynn

Equipment: GPS units, magnetic susceptibility meter, scintillometer, cameras

Route: Walking from the Hab south past the "Boneyard" to the main road parallel to the ridge at the west, to "Bob's Rock Garden" and back the same route

Objectives/Work Done: Taking geophysical readings and samples

Weather: Blue sky with the clouds coming in from the west; warm

Narrative: We walked about

Data Collection Points:

1. 4250767 N 0518144 E
2. 4250689 N 0518131 E
3. 4250611 N 0518178 E

Lessons Learned:

1. Positive scintillometer readings in the cliff wall and sediments that had been washed down the cliff face and the gully.
2. Traveling on foot, you can see a wealth of detail that you miss on the ATV. There's no substitute for being on the ground, sometimes with your face 6 inches from it. But don't forget to look around you, too, to put it all in context.