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So I noticed a sinkhole on a satellite image and hiked to it yesterday. A 2.5 easy hike from the nearest paved road out in the middle of nowhere north of Flagstaff about 25 miles. That’s what I did yesterday. Near Wupatki National Monument is you know the area. The sinkhole was about 100 feet deep with no way inside that I woulda liked to try. The bottom was full of tumbleweeds. Who knows how deep the tumbleweeds are. In spots, maybe 20 feet deep. It woulda been cool to see the bottom before the tumble weeds came to the West about a 100 years ago as they were an invasive species that came from Russia. Mighta seen bones and possible Native American artifacts down at the bottom. Tumble weeds are officially called Russian Thistle by the way.

Brought a rifle in case I came across a coyote as the antelope will be having their young soon and want to help the declining antelope population. Didn’t see a coyote or antelope. Only cut one antelope track about a week old.


Here are some pictures of the sinkhole. One with some pottery shred. I am technically challenged so don’t know how to properly insert them photos. Sorry about that.

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I've never seen something like that in person, but I would very much like to.

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Interesting. Southern Idaho is largely volcanic. There are lots of these holes out in the lava beds although not as deep as that. Most of these are collapsed lava tubes.

I agree about the tumbleweeds. We've been seeing a lot more Russian thistle the last 10 years or so. It's really spreading. People often call mustard tumbleweeds but that isn't the same thing. Between the thistle and cheat grass, our ranges are really taking a serious hit.


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Cool. We have them in northeast Iowa. Most of them are full of rattle snakes and old junked cars.

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Cool stuff…!


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This is a karst region here where I live. Limestone, sinkholes, and caves. I have many, and I many sinkholes, and 3 caves here on my farm.

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Toss a molotov cocktail into those Tumble weeds they'll be gone quick!


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Looks more like what I'd call a grotto forming, rather than a sinkhole.

Sinkhole is a hole in the top of a cave.

Grotto is erosion around a rock face, leading to an undercut.

Looks like just dirt around the rockface.

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Could be

It’s all limestone in the area. Not much dirt cover on top of the limestone

The hole is pretty much vertical all the way around it. One wall was solid limestone, the other sides were fractured limestone. The vertical wall was at least 100 feet deep, the other fractured rock sides were say 50. It’s kinda on a slope.


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Originally Posted by 12344mag
Toss a molotov cocktail into those Tumble weeds they'll be gone quick!


Hahahaha

With my luck, somehow, bad chit would happen if I did


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Doubt its limestone, more likely a slip/fault zone(?) related to the volcanic activity in the area.

https://azgs.arizona.edu/photo/geologic-cross-section-flagstaff-area-northern-arizona


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Those are the kinds of areas I love to explore. Thanks for sharing.


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Originally Posted by 12344mag
Toss a molotov cocktail into those Tumble weeds they'll be gone quick!
Are you really SURE that it's not leaking methane?


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maybe there's different varieties of limestone but around here limestone is white looks more like a variety of sandstone in the picture but without being there it's really hard to tell

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Originally Posted by SBTCO
Doubt its limestone, more likely a slip/fault zone(?) related to the volcanic activity in the area.

https://azgs.arizona.edu/photo/geologic-cross-section-flagstaff-area-northern-arizona

It's limestone. Kaibab Limestone. Flagstaff knows his rocks. this is displacement along the east kaibab monocline runs all the way from Chavez pass up into Ut. Makes up eastern edge of Gray Mountain, the kaibab Plateau, and the cockscomb in southern UT, and even cottonwood Canyon on the way to Bryce.

One of the members in Kaibab Formation has a lot of gypsum that dissolves out and forms sink holes. They are all over the north kaibab (unit 12)

Being on the hinge of the monocline (flexure point) allows even more surface water in to dissolve the gypsum.

Sycamore


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Originally Posted by JamesJr
This is a karst region here where I live. Limestone, sinkholes, and caves. I have many, and I many sinkholes, and 3 caves here on my farm.

The day after we left the Corvette Museum in Bowling Green it caved in and damaged some classics.

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Wouldn't make a bad buffalo jump

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Originally Posted by LNF150
Wouldn't make a bad buffalo jump
Well, I'd look for something shallower as I'd not like to climb down that to butcher a buffalo or 16 and I doubt I'd like carrying buffalo pieces up out of there.


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Originally Posted by 12344mag
Toss a molotov cocktail into those Tumble weeds they'll be gone quick!
That would work! 🤣


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