Speaking as a complete non-expert, I think that what we’re looking at here is a boundary between the low point of a small playa-like section of dried earth and a slightly higher area with black pebbles. The pebbles appear to be volcanic material from a nearby eruption that took place hundreds or thousands of years ago. (The particular feature may have erupted as recently as 800 years, though it has also possibly been longer.)
While I claim no geology knowledge, at least not that extends much further than what I can observe, I can say that there’s an awful lot of fascinating stuff laid bare in Death Valley National Park. Because there is so little vegetation, the earth itself is usually visible, and things that might be obscured by forest elsewhere are easy to see here.
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G Dan Mitchell is a California photographer and visual opportunist. His book, “California’s Fall Color: A Photographer’s Guide to Autumn in the Sierra” (Heyday Books) is available directly from him. Blog | Bluesky | Mastodon | Substack Notes | Flickr | Email
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