Showing posts with label 95A. Show all posts
Showing posts with label 95A. Show all posts

Tuesday, March 22, 2016

Death Valley Trip, Getting There: A Hike to Pleistocene Shorelines

On the second day of our road trip (which began here), we left Yerington at a reasonable though not early hour, knowing full well we'd make Beatty by dinner time.

About an hour later, after reaching the Alt-95–95 junction near Schurz and while still approaching Walker Lake, we found an opportunity to stretch our legs and see some geology in the process. We pulled into a side road leading to a gravel pit...and noticed a dirt road heading straight for some terraces, which I think are either tufa-cemented Lake Lahontan shorelines or a fault scarp.
These are some relatively low hills along the range front in the northern Wassuk Range.
But then we found the old highway, which was built above a historic highstand of Walker Lake—one that must have been at about 4060 feet, below Walker Lake's historic highstand that occurred in 1868 and was between 4089 and 4108 feet—and we left the gravel pit, driving north and looking for a dirt road to take us to the range front.
Here we're looking NNE along the old highway, toward some brightly colored, possibly hydrothermally altered rocks in the northern Wassuk Range.
Oh yeah, I'm a sucker for old roads!

We found a dirt road, one heading toward the canyon way to the left (below). Our goal? The Lake Lahontan shorelines and apparent Lake Lahontan high strandline on the rounded hill near the left.
We're looking southwesterly toward the range front.
A zoomed view of what look like shorelines. One range-front fault may be at the base of the slopes at the bottom of the photo. It's unclear to me from Google Earth how faults and shorelines are interacting.
The same range front and shorelines, looking more to the northwest.
Hike, hike, hike...hike, hike, hike. After about 15 minutes, I arrived at a boulder-strewn shoulder just below what I think is the highest Pleistocene shoreline.
We're looking west toward Reese River Canyon (not the same Reese River as in central Nevada). The canyon looks worthy of future explorations.
Now I'm standing on, as near as I can tell, the highest Lake Lahontan shoreline, looking to the south.
What's that across the dry wash?
Zoomed in, we can see a contact: poorly sorted Quaternary deposits above orange-brown hydrothermally altered rocks.
Is that a fault? Is it a sedimentary contact, either related to fan material being deposited along the range front or a wave-planed shore? I can't answer that question without going back to investigate.
MOH went on ahead to the top of the hill.
The highest ancient shoreline (Sehoo age) looked to me to be at the flat area I was standing on, just about at the often reported elevation of 1332 m (4370 feet), although the next slight break in slope—the change in color just below MOH—coincides with a strandline reported elsewhere of 1338-39 m (about 4390-4393 feet).
Looking to the north, we can see this same break in slope (the one I was standing on), with some ancient shorelines below it (especially to the far right). Note the change in color—green above to yellow below.
The yellowish or straw-colored areas along the break in slope are from a closely spaced, dried-out plant, probably Halogeton.
Done with my brief shoreline study, I walk back down to the bouldery shoulder, thinking that I'll eventually examine the intriguing contact across the wash.
First, I'm distracted by the granitic boulders. This one has a nice pegmatite dike cutting across, weathering out in relief.
Then I'm distracted by these little wildflowers growing on, near, and all around the granite boulders.
This is some kind of filaree or storksbill, probably Erodium cicutarium.
A lizard!
A bee!
Perhaps I got carried away (and didn't get to the contact across the wash) because this was the first wildflower spot of the trip.
The bouldery slope seen from below.
I turned my sights to the east, to the western range front of the Gillis Range, where I could see more ancient Lahontan shorelines.
This part of the Gillis Range is called the Agai Pah Hills.
Back at the Jeep, I looked off to the northeast, to a broad, flat area really out in the middle of nowhere.
I decided to test out my 300mm zoom (450mm in 35mm equivalent). The closer, rocky hills don't have a place name on USGS maps. Red Ridge is the name of the lower hills beyond that; the mountains beyond are the Sand Springs Range, south of Fairview Peak.
We continued on our way, southward toward Hawthorne, Mina, Coaldale, Tonopah, and Beatty.

Location map

Related Posts (in order of posting):
Death Valley, "Super" Blooms, Turtlebacks, and Detachments
Death Valley Trip, Part 2: More of the Badwater Turtleback Fault
Death Valley Trip, Part 3: Northward, and over Daylight Pass
Death Valley Trip, Getting There: Wave Clouds beyond the Sierra

Friday, March 18, 2016

Death Valley Trip, Getting There: Wave Clouds beyond the Sierra

Our trip began like this, although I didn't get any photos the first day, as we drove south, then east, then south again under fabulous wave clouds. It began with a bit of a rumble: The Jeep went into a noisy, rattling shimmy upon reaching 45 mph, and we had to pull into a tire shop. We got the tires balanced, ate lunch at a local diner—a lunch that included two large, old fashioned chocolate milk shakes—and went on.

We drove south with the high wind aloft evidenced by continuous and co-mingling stacks of wave clouds coming off the long linear range to the west. The waves were stacked almost indefinitely out over the Honey Lake basin and beyond, where they were coalescing into a high, thick stratus layer.
Approaching the first Red Rock turnoff, with Peavine not yet in view, the lenticulars came into their own, at first disintegrating from a near mass into many wispy and shredded lenses, and then turning into three or more parallel roads in the sky: the primary wave off the Sierra Nevada and the Carson Range, the secondary wave perfectly parallel to the first and a little ways off to the east, and the tertiary and quaternary waves ... well, they were there, but they were beginning to merge together, or to merge with the primary and secondary waves off the Virginia Range—close in they would appear as individual sets of stacked waves, farther out they would pile up against each other in a kind of jumbled mass, and even farther still they would metamorphose into a fluffy, wavy blanket.
The way it looked, sans color, when we began our trip down to Death Valley, looking south near Reno or Carson, 27Feb2016.
A couple times, as we drove south and then east, I reached a state of mind that I first noticed a long time ago when flying in some airplane: In this case, sitting in a Jeep while effortlessly driving, I seemed to be standing still while the mountains, clouds, roadcuts, and other drivers moved—instead—around me, as though I was in the middle of some 3-dimensional movie with the props being rapidly changed for my benefit. When I feel this way in an airliner, it seems as though I'm not going anywhere; instead, I'm just in some giant, crowded box, and people outside, who I can't see, are somehow shaking the box to simulate vibrations and turbulence, while they also somehow roll a scenery tape by my window. Before I got on the plane, the props (buildings, streets, people, everything) made the place look like Reno; by the time I got off, all the props had been changed to make it look like Alaska (they changed the buildings, streets, and people, and added steeper mountains and maybe some snow).

At Dayton, we drove under the secondary wave off the Carson Range, which was now a vivid, grayed yellow, almost the color I associate with incipient funnel clouds.

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The cloud overhead was colored something like this.

A few tiny sprinkles hit the windshield of the Jeep, barely dusting it. The stacked lenticulars to the southeast, out over the Pine Nuts and beyond the river route to Ft. Churchill and Weeks, turned bright golden yellow, then faded to soft peach mixed with salmon, then faded even more to a soft pink. The distant hills past Talapoosa turned bright pink, lit by the last bit of alpenglow.
The river route from Dayton to Weeks (Weeks is the spot where the Carson meets Alt-95). The map is courtesy USGS. We didn't take the route, though it can be a nice drive. It can also be long and washboardy and is best driven during the day (unless you know the road).
Dark colors took over the skies as we turned SE onto the Ramsey-Weeks cutoff, and darkness set in. We drove into headlights, coming finally to a town we hadn't intended to stay in (we thought we would reach Tonopah the first night, but our delay at the tire shop changed our expectations). We had an average Mexican dinner, accompanied by exceptionally hot salsa and lackluster margaritas. We found a nice, cheap room and settled in for the night.
You can see the first part of our trip on this map, although the default view will change with more recent posts, so you might have to page around to find the first, northern leg. The two photos were taken at Honey Lake rest stop on 3Mar2016.

Related Posts (in order of posting):
Death Valley, "Super" Blooms, Turtlebacks, and Detachments
Death Valley Trip, Part 2: More of the Badwater Turtleback Fault
Death Valley Trip, Part 3: Northward, and over Daylight Pass