Tuesday, May 23, 2017
High Water Across the West: The Humboldt River in Carlin Canyon — With the Carlin Canyon Unconformity!
Diamond Peak Formation, which is sometimes mapped as the equivalent Tonka Formation in this area.
Zoom in on this feature with a GigaPan by Ron Schott. And if you click the Google Earth link below his GigaPan, you can view the feature *and* the GigaPan in Google Earth!
Tuesday, May 16, 2017
I have several years of pictures of Honey Lake: there are these comparison photos from 2007 through 2011, these few photos from May and June of 2015, and one photo from early March, 2016. Even more photos can be found by searching the blog for "honey" (along with a few from nearby Pyramid Lake). Most of my photos through the years have been taken from the Honey Lake Rest Area).
Thursday, May 11, 2017
Wyethia or Balsamorhiza of some type (likely the former, I think). I don't know what the little blue flowers are, but they are beautiful.
Eriogonum, and more unknown tiny yellow flowers.
Tuesday, May 9, 2017
|What is this?!!1?1!?|
There I was, fiddling around looking at rock types and contacts. The map wasn't easy to look at in Google Earth (GE) because it was in black and white, so I started drawing the contacts on to GE, and lo and behold, the contacts were all screwy. It took me a while to figure out that the kmz file didn't register properly on GE; perhaps it didn't have a NAD27 to WGS84 correction or some such thing. I plotted a few static, known localities that I could identify on both the map and GE and determined that everything was off in a northwesterly direction (map to GE) by about 1500 to 1900 feet.
|The map and GE locations of a small dam and the ghost town of Palisade.|
I was frustrated by this mis-registration of the map on Google Earth—what is the point of a kmz file of a map, after all, other than to be able to use it easily and forthwith—so I continued drawing on a few contacts in the area I was initially interested in: the area near the small (or old) dam shown above.
Oh look, there's a huge landslide or slump block mapped! I always find these fascinating, so I zoomed in on that, after figuring out that, indeed, I had stopped along the road once—in a pullout near the dam—and had found ash-flow tuff in the roadcut, just like I had remembered! (Although in this case, it was probably slumped or slid ash-flow tuff rather than 100%-in-place ash-flow tuff.)
And then I remembered that I'd always thought there was a pediment in Pine Valley, and recent drives through the area seemed to confirm that, though I wasn't sure if it would be considered a pediment because it seemed to be formed on Quaternary-Tertiary sediments. A couple of old reports (Regnier, 1960 and Eakin, 1961) confirmed that a pediment (or two, even!) had been identified in the valley—and that's when I went nuts with my GE squiggles, and started drawing in all the Quaternary gravels so I could better visualize the valley's geomorphology. That resulted in the squiggles seen in the first image: an incompletely labeled map with missing contacts but with pediment gravels outlined in great detail.
Then, I moved up to Carlin Canyon and—unsuccessfully in my opinion—tried to plot the unconformity contact. (See Ron Schott's Gigapan of the Carlin Canyon unconformity here.) And then I moved to the Carlin Formation east of the Carlin Tunnels. The Carlin Formation forms golden-brown outcrops and cliffs right alongside the highway, great examples of tafoni weathering, so close but inaccessible. I wanted to see if any roads led into the area, and there are none, but I drew some squiggles for the geology in that area anyway, and then moved south of the highway to draw in a few more areas of the Carlin Formation, because once I've started on something, it's hard to get me to stop.
|An expanded version of my GE squiggles.|
By the way, the completed geologic map (Smith and Ketner, 1978), published in color, can be viewed here (but without a kmz file).