Impressive lava-river interaction in Argentina
This site was discussed in the following talk:
This site was discussed in the following talk:
Posted via email from Fresh Geologic Froth
Kathy C. turned me on to this example yesterday. I had no idea. Lava flow is only about 250 yrs old. It is in the Stikine Volcanic Field. There is a related, somewhat brief, paper:
Posted via email from Arbitrary Frothings
This underwater picture shows a lone submerged tree in Clear Lake, OR.
There are many more than this. One (maybe most) date to about 2700 yrs
bp when a lava dam blocked the McKenzie River. Freezing water,
exceptionally clear.
Posted via email from Fresh Geologic Froth
Finally devised a way to confidently and easily extract profile data from the LiDAR data set in GlobalMapper. Surface profiles are simple. Basal profiles shown here are estimates based on some point measurements. Will vastly improve the basal profiles when GSA is over. Needed this figure, however, so spent too much time devising the method.
Posted via email from Fresh Geologic Froth
Preparing for my GSA lava talk and came up with these new versions of
the map of the Owyhee River study area. The second one is just the lava.
Posted via email from Fresh Geologic Froth
This one supports the tenet:
'Intracanyon lava flows, the gifts that keep on giving'.
A garishly colored map that underscores the tight linkage between
landslides and lava flows on the Owyhee. If it is not the margin of
the lava flow that is failing, then it is the canyon wall that the
lava flow forced the river against that is failing (or both).
Certainly a tight coupling in this reach, no?
Posted via email from Fresh Geologic Froth
Posted via email from Fresh Geologic Froth
An obvious, but overlooked addition to the Oywhee River lava-dammed lake story. This is the approximate extent of the early Pleistocene lake caused by a Bogus Rim lava dam crest of 1210 m at Iron Point.
Posted via email from Fresh Geologic Froth
This upstream-looking 3-D block rendition of the Ryegrass Creek area on the Owyhee is intriguing. The color ramp works well here because the strata are flat-lying. Note the boulder-covered and very flat surface below the Qbsy and above Ryegrass Creek...I suspect it relates to the pre-Saddle Butte lava Owyhee or Ryegrass Ck channel in some way, but I have never actually stood on it. Also, look at the morphology of the eastern edge of the Qbsy where the lacustrine seds sit...distinct linear trace there was map as fault by Ferns et al., but isn't it just the contact between the paleovalley wall and the lava? What about that abrupt wall in the Qbsy flow just beyond there? Looks like it is heading down a narrow valley.
Posted via email from Fresh Geologic Froth
Posted via email from Fresh Geologic Froth
What is left:
1. I need to do a full pass through the entire map and fix the topology and the line attribution and final fine-tuning. I have already started this in the Hole in the Ground area.
2. Unit descriptions need to be written up using Cooper's thesis as a base. This part will require input from all principal members of the research team
3. Accompanying text to the map. This will be a detailed accounting of the geologic history implied / required by the geologic map.
4. Send the whole package out for review. Likely, we will do this through DOGAMI who have agreed to publish the map if we can cover most / all of the costs.
Now, back to the lower Walker River map due in 15 days.
Posted via email from Fresh Geologic Froth
Screenshot that shows the current status of my mapping in a key area. Landslides are green and broken into three relative ages (brighter=younger). Red lines have not been attributed yet. Map is coming along nicely.
Posted via email from Fresh Geologic Froth
Ok, so maybe I spent enough time out there in 2007, 2008, and 2009. Yikes. As expected, the parts of the map that are the hardest to compile in the office are those areas I never hit on the ground.
Posted via email from Fresh Geologic Froth
Yes. I am a little late on getting my NSF annual report done...why these are due 3 months before the end of the year in question is beyond me. Most annual reports are due within 3 months of the end of the contract year. I suspect that someone made a mistake in the original paperwork and simply won't own up to it.
Posted via email from Fresh Geologic Froth
Sure, I have gone on and on about the amazing visualizations you can get with some tweaking of LiDAR data; however, it turns out that a pretty basic representation is also quite useful...contours. Yes, contours. Sometimes smaller scale features remain somewhat ambiguous in hillshades or slopeshades, but high-res, short interval contours from the LiDAR data can eliminate most of the ambiguity. In this case, it is a tiny area that I have struggled with on the Owyhee River. Here, a large landslide entered from the north, shoved the river channel to the south, and the river eventually worked its way back to the north to some extent. The array of surficial deposits in the void that comprises the right hand side of the image south of the river record this sequence of events as well as subsequent sedimentation by tributary fans. The contours really highlight the fans, and in conjunction with discernible drainage patterns evident in the LiDAR, it is clear what is fan and what is river, right?
Posted via email from Fresh Geologic Froth
I created this lake by generating a contour from the LiDAR dataset at an elevation of 1046 m. GlobalMapper does this in about 1.5 minutes. Then, exported the vector as a shapefile, cut out the parts of the line that occur downstream from the dam, stitch the remaining loose ends, build a poly from the line and there it is.
Posted via email from Fresh Geologic Froth
Posted via email from Fresh Geologic Froth