State of the Owyhee River map, March 25, 2010

Believe it or not, this one is almost done. I have posted proof of that before. What remains is the correct attribution of all of the lines that you see in red. I am systematically going through the map and fixing all of these. I started at the east end. Don't ask why so many lines are unattributed...long story.

The first image shown here is the extent of the mapping taken to the source vents of the intracanyon lava flows. In this version, only the lava flows and landslide complexes are shown in color. The second image hones in on a small part of the area of detailed mapping (i.e., the river corridor where I have LiDAR and have logged many, many miles of reconn). It has the same color scheme but reveals that there are many other types of units...mainly fluvial deposits.

3-25-2010_5-30-57_pm

3-25-2010_5-36-50_pm

The 1160 m spillway of the Bogus Rim lava dam.

3-8-2010_1-12-33_pm

The 1160 m elevation is a plausible call for the 1.8 Ma Bogus Rim lava
dam on the Owyhee River, OR. Consider these points:

1. It does not generate a lake that laps on to western margin of the
subaerial part of the Bogus Rim lava flow upstream.

2. It coincides with the downstream edge of the upstream-most couplet
of Bogus Rim lava remnants on both sides of the gorge below Iron
Point.

3. It is the elevation of the first unequivocal gravel outcrop on the
surface of the Bogus Rim lava flow in the gorge.

Issue: The highest pea gravel clast(s) I can find on the outer edge of
the Bogus Rim flow occur at 1205 m. An exceedingly sparse array of pea
gravel admittedly, but pea gravel nonetheless.