NV-447 Lake Winnemucca (0805)
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NV-447 Lake Winnemucca (0803)
Looking across the dry lake bed of Lake Winnemucca (see description in adjacent picture).
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Don Barrett (aka DBs… club has replied to ClintThose parallel lines across the valley, particularly well-defined on the left side of the photo (outlined), are indeed probably Lahontan shorelines, and that terrace is probably a shoreline bench. There's a complication, though: the range front of those mountains across the lake bed is defined by a large boundary fault, and that's responsible for some of the linearity. Sometimes fault scarps associated with recent breaks can look like shorelines. I don't think that's happening here, because the lines are so parallel to the lake bed and look to be following contours. Faults don't have to run along at exactly at the same elevation, and don't follow contours! There _is_ abundant evidence of large-scale faulting, tho; see the flat triangular faces terminating the ridges (outlined). Such so-called triangular facets are a common indication that the edge of the range is truncated, indeed defined, by a fault. Once you "get your eyeballs calibrated" you start to notice them all over the Basin and Range. (Sorry for the notes on your pic, Don--I hate it when people do that. They're just for illustration and feel free to delete them!)
Here's an old slide of mine looking more directly at the facets:
www.ipernity.com/doc/289859/22878267/in/album/439085
Btw, that gray rock is probably a rhyolite, but I haven't been over to check!
Here's another pic looking across farther north, away from the well-defined facets, also showing the shoreline features:
www.ipernity.com/doc/289859/22880809/in/album/439085
(A little editing to hopefully clarify my purple prose a bit--)
Don Barrett (aka DBs… club has replied to slgwv clubFrom my reading of what you've written, the fault line would then be the east side of the lake running almost directly north / south at this point and the triangle shape slopes is from the shearing of those mountains. Looking at the satellite view gives a good indicator of the horizontal lines as former shorelines. Re the rhyolite, the extent of the flow is evident in the satellite photo, and it looks like there are some interesting (but probably difficult to navigate) roads into it. Given the coloring, would there be a likelihood of obsidian?
FYI, the Wikipedia page on Lake Lahontan seems good, indicating that Winnemucca was a remnant that dried up in the 1930's. en.wikipedia.org/wiki/Lake_Lahontan
Clint has replied to slgwv clubThanks for the info!
slgwv club has replied to ClintBtw, "Nixon" is not named after Tricky Dick but a Nevada senator from around the time of WW I. Dunno if he's a distant cousin!
Don Barrett (aka DBs… club has replied to slgwv clubSign-in to write a comment.