Showing posts with label sedimentary rocks. Show all posts
Showing posts with label sedimentary rocks. Show all posts

Tuesday, August 6, 2019

Winnemucca to Hwy 395 north of Susanville, Part4

And now we’ll say goodbye to the Smoke Creek Desert, which we saw on the last leg of this cross-country journey, and make our way south for a very short distance, where we’ll turn off the road skirting the entire west side of the desert, and head west up Smoke Creek. Photos you’ll see in this blog post are from three different trips taken between the Smoke Creek Desert and Highway 395 during May through August of 2006, 2014, and 2015. Which means that although we’re returning to my June 15, 2018 trip from Winnemucca to Susanville, which began here,I didn’t take any photos during this section of the 2018 trip.
Immediately upon leaving the great tufa mounds of the last post, we come to a hill with a view of distant trees that are growing along lower Smoke Creek. The sign indicates our upcoming turn onto the Smoke Creek Road. The smaller, hand-painted white sign says “Smoke Creek Road,” so we know we’re on the right track. (Photo: 17May2014.)
On the left side of the road, just as we turn right, a bullet-ridden sign points south toward Sutcliffe, a small town on the west side of Pyramid Lake several miles beyond our turn. This will be our last view of the Smoke Creek playa and the Fox Range to the east. (Photo: 14Jun2006.)
We’re now heading about due west toward the valley of Smoke Creek. In this area, a lot of the creeks and canyons are named on USGS topo maps, but very few of the hills are. As an example, the highest point on the volcanic-covered hills above is merely marked with an X and the elevation 6186 feet, along with a small triangle for a survey point with the name Smoke. (Photo: 17May2014.)
Smoke Creek Road
US 395 Jct 30
Litchfield 39
Susanville 55
(miles)
The basaltic hills, and the sagebrush in the foreground, were fairly green in mid-June of 2006. The buff-colored hills are underlain by Lake Lahontan lake deposits, possibly the Sehoo Formation, which are inset into the older, Miocene basalts. (Photo: 14Jun2006.)
We’re about to round the bend and drop in the valley of Smoke Creek. (Photo: 17May2014.)
Here you can possibly get a better idea of the younger lake sediments being inset into the canyon, such that although the buff-colored deposits are lower in elevation than the reddish brown basalt flows, they are not underlying them in a stratigraphic sense. This hill also shows the first example of Lake Lahontan tufa plastered on basalt (pale brown tufa on dark brown basalt in the upper left part of the photo). (Photo: 17May2014.)
The older sediments that underlie the basalt have been baked to a bright red color in this view not far up the canyon. (Photo: 14Jun2006.)
And there’s more! A large mass of light brownish tufa sits atop vaguely spheroidally weathering dark brown basalt. For locations of these photos, check out the map linked near the end of the post. (This and next photos from 15Aug2015.)
Less than a half mile from the sharp turn near the west end of the canyon, we come upon the “Cave in Smoke Creek Canyon,” which is along the Nobles Trail section of the California Trail.
“There is a cave ... in this canon, the entrance of which will admit a man on horseback several of the company having entered on horseback but I do not think that they saw much for it was dark as pitch in the cave” – Mary C. Fish, Sep 7 1860
The signs along the various trails are maintained by Trails West. A photo tour of the trail can be found on their website here.
Our first view of the mouth of the cave, as seen when coming in from the east.
A closer view.
The cave with wild roses in bloom. (This and next photos from 17May2014.)
The cave has plenty of room overhead, and people obviously camp within. The roof is darkened by soot from many fires over the many years.
The view from the cave.
Across the creek from the cave, I spotted a cinnamon teal

to be continued...
Google Maps location map.

Related Posts:
Winnemucca to Hwy 395 north of Susanville, Part 3
Winnemucca to Hwy 395 north of Susanville, Part 2
Winnemucca to Hwy 395 north of Susanville, Part 1
Things You Find in the Field: Sulfur at Sulphur
Blue Mountain (2012)
Pulpit Rock (2012)
Smoke in the Black Rock & Smoke Creek Deserts (2102)
Where in the West: Black Rock Desert (2008)
Where in the West - June: A Second Look (2008)
Where in the West - June (2008)
Name That Place (2008)

Tuesday, August 7, 2018

Roberts Mountains Viewed with and without Smoke

These photo pairs of the Roberts Mountains were taken in early May and early August from not quite identical points along the Tonkin road in what amounts to the southern part of Pine Valley in north-central Nevada.
Roberts Creek Mountain is the highest peak in the first photo pair.
The rocky foreridge in the second photo pair is underlain by the Ordovician Eureka Quartzite, with various Ordovician through Devonian carbonate formations above the quartzite and various Cambrian through Ordovician formations below it.
A little geology.
Yeah, it was quite smoky when I drove through last week — and probably still is — with this particular batch of smoke coming primarily from the Ferguson fire in Yosemite.

Photos taken 1May2018 and 4Aug2018.

Tuesday, July 24, 2018

Winnemucca to Hwy 395 north of Susanville, Part 1

We began our northern Nevada road trip about a month ago at this blog post about Sulphur, Nevada, a real ghost town located more or less a third of the way along our route. To continue with the trip, we’ll take a step back for a re-start in Winnemucca (The Griddle, above is a good place to stop for breakfast or lunch), though we could just as easily start somewhere to the east, say Elko, although the trip then would become longer. Our goal will be to make it, eventually, to the NV-CA state line west of the Smoke Creek Desert, and from there to U.S. Route 395 north of Susanville. We'll get to 395 by way of a fairly obscure dirt road that will take us from the Smoke Creek Desert in Nevada to a nearly non-place called Viewland, CA. See my Google Maps plot of this route, along with photo locations and other points of interest along the way. I'll add points to the map as our trip progresses.

The Jungo Road (Nevada S.R. 49 and 48) will be our gateway to the Black Rock Desert and points west, and to get on the Jungo Road we'll take U.S. Route 95 north out of the center of Winnemucca a very short distance, where we'll turn left onto the Jungo Road almost immediately after crossing the Humboldt River. Right at the Winnemucca convention center, essentially our starting point, you’ll note a sign stating that the road north (U.S. 95) is part of the Winnemucca-to-the-Sea Highway.

If you're inclined to travel northward instead of westward, have a look at my 2010 Oregon Trip Series, a series dedicated to road tripping over a portion of the Winnemucca-to-the-Sea Highway and other roads as well.
Lo and behond, the Jungo Road starts out paved as it leaves Winnemucca. That’s Blue Mountain nearly straight down the road.
At this point, just about 6 miles into our journey, we get a good view of Little Tabletop Mountain, which is a basalt-capped mesa south of the road. MOH and I used to call these hills “The Pancakes.” From the south side, they look a little like a tilted stack of pancakes.
"The Pancakes" from the south, as seen in Google Earth.

It’s difficult to get a photo of these hills when driving 80 mph on I-80, unless you happen to be sitting in the left passenger backseat, so I resorted to a G.E. view.
Before long, the paved portion of the Jungo Road ends; it becomes a magnesium-chloride treated road...a magged road. I figured the magged road condition would extend all the way out to the Hycroft gold mine, but I forgot that they are not operating with a large crew like they were a few years ago when the mine was active. Hycroft is still running their heap-leach operation while testing the feasibility of operating a sulfide leach pad, but the large crews are a thing of the past, at least for now (see Hycroft’s January 10th press release [pdf] for more about sulfide leach testing).
Here we are at the same locality as the previous photo, about 9 miles west of Winnemucca, looking back towards Winnemucca and the Sonoma Range.
The magged part of the Jungo Road currently ends at the turnoff to the Blue Mountain geothermal field, aka Blue Mountain Faulkner 1, which is just on the west side of Blue Mountain. Magging prevents dust, so the road is dusty to the west. One good thing about dust: you have a better chance of seeing that someone is heading toward you. A bad thing about dust: breathing it, of course. Magged roads have one particular disadvantage: they are very slippery when wet, almost like driving on greased snot!

Although the sign at the turnoff to the geothermal field says "NGP Blue Mountain 1 LLC," the power plant is now owned by AltaRock (or not - UPDATE 15June2019). The field was discovered during gold exploration conducted in the 1980s or 90s.
I often stop on a small-looking playa near Jungo—it seems to be a good spot for a pit stop, being about 1 coffee from Winnemucca, and when it’s hot, which it was on June 15th when these photos were taken, it’s definitely time for more hydration. It turns out that this playa is the southern part of the larger Desert Valley playa, which extends 46 miles north-northeast from about 6 miles south of Jungo, all the way to the Quinn River about half way between Winnemucca and Denio. Desert Valley is the 10-mile-wide basin between the Jackson Mountains on the west and the Slumbering Hills (a mountain range) on the east. The Sleeper gold mine was named for it's location in the Slumbering Hills (and also because it was a "sleeper?").
Here we are coming into Jungo, which is a railroad siding located at or near the junction of the Jungo Road with the Bottle Creek Road, which heads up toward the Bottle Creek mining district and the main part of Desert Valley. The well-bedded rocks in the hills ahead of us—a northward continuation of the Antelope Range or a southern part of the Jackson Mountains—are part of the Jungo Terrane, a thick pile of turbiditic shales with sandstone and limestone interbeds that were deposited in Late Triassic to Early or Middle Jurassic time (Luddington et al, 1996 and Crafford, 2007).
Not recognizing in the moment the exact location of Jungo, I took a photo of the junction with the dirt road that comes up with Imlay. If you happen to start this trek in Imlay, you'll cross the Humboldt River just above Rye Patch Reservoir, and you'll pass by Haystack Butte, a geographic marker that can be seen from the Applegate Trail.
I don’t do it often, but on this trip I went ahead and took a couple photos of two of the old mining cabins at Mandalay Spring. I’m not sure why these shacks are present (besides the spring) or what era they date from. I’ve been inside at least one of them—for some reason the entire enterprise struck me as depressing (maybe it was the peeling wallpaper or strings of disintegrating clothes; maybe it was just me).
This cabin is located a little closer to the spring and at about the same elevation; whereas the first cabin sits up above overlooking the spring.
I took this photo at one of the first spots to pull over and get a good look at the Black Rock Desert, which on this day was partly obscured by summer haze. Black Rock Point, for which the desert was named, is a small, dark hill just to the left of the road as it points off toward the vast playa; a closer view of the point can be seen here. The little hill in the foreground is part of a Pleistocene Lake Lahontan shoreline. There was another obvious shoreline just 200 m east of this smaller one.
We'll end this part of our trek at Pulpit Rock.
Google Maps location map.

Selected References:
Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate.

Ludington, Steve, McKee, E.H., Cox, D.P., Moring, B.C., and Leonard, K.R., 1996, Pre-Tertiary geology of Nevada, Chapter 4 in Singer, D.A., ed., An analysis of Nevada's metal-bearing mineral resources: Nevada Bureau of Mines and Geology Open-File Report 96-2, p. 4.1-4.17, 1 sheet, scale 1:1,000,000.

Friday, December 22, 2017

Twelve (or Ten?) Months of LFD (2017)

I'm doing the year-end meme wherein I compile the first sentence of the first post of every month. Meme rules are as follows, as per DrugMonkey (2014):
Post the link and first sentence from the first blog entry for each month of the past year.
I also add the first photo from the same first post. Previous takes on this Twelve Month meme at LFD were posted for 2008, 2009, 20102012, 2014, 2015, and 2016.

Aaand...here's the year 2017 for LFD:

January:
It's been icy cold in the far northlands, with temperatures hovering not too far above zero for several days.

February:
It was a late fall day, and I stopped along Route 447 to see if I could get close to some of the brilliantly colored trees along the Truckee River a few miles north of Wadsworth.

March:
I planned to have this descriptive section as part of the last post—the one about being packed and ready to leave town—but this "little bit" grew and grew, and eventually it had to find its own home.

April:
I was looking back through some photos and realized I had some of the Roan Cliffs from the spring of 2006.

May:
What is this?!!1?1!?
It all started when I was trying to find out what rock formations and rock types I was seeing while making the long trip to work and back out near Elko.

June:
I'm moving slowly on this mini-series about the Humboldt River while working essentially 12-hour days and while (hopefully) recovering from some long-lasting bug I caught on the road or out in Elko more than two months ago.

July:
Returning once again to my spring mini-series about all the rivers and lakes that are at higher levels than I've seen in quite awhile (most recent post), I decided this time to show a few pics of the Truckee River, which I drive by quite frequently.

August: Nothing.

September:
It's been a busy summer, such that I really haven't had time to get much blogging done—and I had so many good posts planned!

October:
This is a classic road song with "road" right there in the title, courtesy once again of MOH.

November: Nada.

December: (this post).
I'm doing the year-end meme wherein I compile the first sentence of the first post of every month.

Tuesday, May 23, 2017

High Water Across the West: The Humboldt River in Carlin Canyon — With the Carlin Canyon Unconformity!

Well, there we have it: the Carlin Canyon unconformity with the Humboldt River running nearly bankfull on April 11th of this year.
Looking downstream, back toward the tunnels, we're actually still looking at the unconformity, but it's cropping out poorly on the slope below the tilted limestone beds of the Pennsylvanian-Permian Strathearn Formation.
I went ahead and cropped the best photo I took so we could zoom in on the unconformity in it's classic exposure, and then drew a line right along the contact.
The Strathearn lies unconformably over the near-vertical (to locally overturned) Mississippian-Pennsylvanian 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, April 11, 2017

From the Road: The Book Cliffs in Western Colorado (Mount Garfield)

Earlier that day (the same day I stopped in Parachute and Rulison, resulting in three posts about the Roan Cliffs), I had pulled over at the convenient viewing pullout on I-70, which is east of Grand Junction and a bit west of Palisade. It's hard to pass by this cliff, part of the Book Cliffs, without taking a picture or two. This time, unlike most other times, I took only one photo!

The Book Cliffs are capped by sandstone and lesser shale of the Upper Cretaceous Mesaverde Group, which overlies shale and minor siltstone and sandstone of the Upper Cretaceous Mancos Shale. The Mesaverde Group (sometimes Formation, see Geolex) usually consists of several recognized sandstone tongues, members, and formations, with intertongues of Mancos Shale in its lower part. In the area of these photos, the mapped sandstone formation—the buff-colored cliff-former above the Mancos—is the Mount Garfield Formation, obviously named for Mount Garfield, the highest point above the cliffs, on the upper left.
I cropped the photo to zoom in, partly because the nearly white layer just below the sandstone cliff caught my eye. While here, we might as well take a peek at the geologic contacts.
Kmg is the Mount Garfield Formation; Km is the Mancos Shale. The contact I’ve drawn in is largely from the Geologic Map of the Clifton Quadrangle, Mesa County, Colorado (Carrara, 2001), with extrapolation from the Geologic Map of the Palisade Quadrangle, Mesa County, Colorado (Carrara, 2000). The contact very roughly approximates the one shown on the Macrostat online geologic map.

Other photos of mine of the Book Cliffs can be seen here (photos from 2006) and here (photos from 2008). Also check out Ron Schott's GigaPan of the cliffs.