We dug up and remonummented this original GLO stone today that was set as the last monument at the end of the day on September 6, 1857. The GLO surveyor called it a granite stone. Surveyors in the late 1800's referred to it as a "Blue Flint". It has the proper hash marks on the sides, so it is indeed the original.
The surface of the stone was rather chalky in nature. However, when I tried to drill a hole in the top it was so hard that the masonry bit could only make a small indentation.
Any geologists know the proper name for this type of stone?
> Any geologists know the proper name for this type of stone?
>
I'm not a geologist, but here goes: "HFR" 😉
wow
(Sorry, i am not answering your question).
You must have been confident that you could find the stone by digging so small a hole. How did you know where to dig? was the data from the 1857 survey so reliable, or was it resurveyed recently?
wow
Most of these locations in the roads have some sort of iron either over them or beside them.
last time I saw stones that color and size, I'd been deployed for 15 months.....:-P
Meteorite. The pits and the four striations on the side are the result of incredible temperatures on entering the earth's atmosphere.
😀
Is Eugene still around?? he would know.
It looks like some sort of limestone, but my frame of reference is small, especially if it is indeed granite or igneous. Most of the native stone around here is sedimentary. I can see the blue, however.
SE of 17 or SE of 9?
It looks like the stone got so hot that you scorched the top!! 😉
SE Corner 9 (11N-5E) 6PM
Jerry - were you using a hammer drill? If not Paden could be correct. Mike
The Gelogical Section of Nebraska
Page 39 and 40 of the link refers to the Big Blue series. It seams like a blue shale.
The chase group in southern Nebraska/ Winfield Limestone formation/(2) Grant Shale is described as Bluish-gray to olive, geodal, fossiliferious in basal portion,...
If you had a good field glass you should be able to see small bits of fossils in the grain.
But that is just my shot in the dark.
Yes, a Dewalt hammer drill with a high quality masonry bit. You could easily scratch the surface, but could not drill into it. Most of the stones used here are glacier stone the crews picked up off the prairie. Occasionally they wopuld find an outcropping of white limestone or dark brown sandstone that they would mine to get some stones, but it was easily to just pick them up as you go.
Leverite! 😉
HA! Had to look that one up; a new one on me.
That makes it softer than steel (scratching) but resistant to drilling....
Wish I could see it in person to make a more educated guess.
Here comes humor attempt:
My uneducated guess is that this is a reomorphically-dismingulated xenolith.
Keep finding those great monuments, Mike
In the last photo it appears there is a thin vein of quartz running through the stone, which would indicate an igneous type of stone, association with plutons, either basalt or granite. Close inspection of the stone with a magnifying glass would indicate a crystaline structure, not a sedimentary type stone (usually somewhat softer than granite and with fossils or crumbly texture. From the wear on it, it looks like a glacial erratic, rafted in on ice during one of the past ice ages from some distant location where the sides were worn smooth by rubbing as it was carried along. Basalt and granite can be very hard, particularly basalt. When mountains wear down, they are usually what gets left over.
Just an educated quess.
Looks like a sex stone. (F'in rock)
Just kidding.
Just a couple miles south of Branched Oak Lake......
did you do any fishing?
😉
😀
