Not a mushroom.

[Older The Better]

Went looking for mushrooms and saw this... at first I thought it was the concrete base to a fence post but looked closer an noticed it was limestone.... at least I think. There are no larger rocks in a matrix like concrete and I’ve took pictures of several fossils in the rock. It looks like a core drill but it’s huge for a core. Its also found in a rural area that’s been pasture/farmland for 140 years before that Indian country so I can’t imagine an operation where someone would drill out a plug. No hole for a grinding wheel. I really don’t know what to think of it.










Also found a few mushrooms

 

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[3cylbill]

I like the morel of your story...

 

[dingode]

A core from a drill maybe?

 

[Older The Better]

A core from a drill maybe?

That’s what it looks like but I have a couple problems. One seems unnecessarily large for a core. Two it’s not straight it seems to kick off to the side. But still seems to be the best explanation. I can’t imagine someone would shape it that way, and if it was a sort of mill or grinding stone I would think there would be a hole to fix it in place

thinking about how it’s not a straight cylinder makes me wonder if it was drilled from each end. Going with the grinding stone idea maybe this rock was drilled out to make the hole in a larger stone. Which may have been hauled a mile or two to the mill on the river

 

[nagant]

maybe sackcrete mix used to plug a corrugated drain pipe that rusted away?

 

[Older The Better]

I thought concrete at first too but the fossils and a uniform matrix makes me think it’s limestone

 

[Red-Coat]

I believe that’s man-made ‘shellcrete’. It’s a mixture of crushed shells (usually oyster, but you can use anything) with sand, lime and water that was used as a cheap construction material from the mid-1800s onwards. Everything from foundations, walls, buildings, pillars, columns, cisterns and general use as a filling material.

This is a coarse version but it can be made to any texture you want, with varying degrees to which shell remnants are still recognisable.

 

[Older The Better]

No oysters here in Kansas but you think crushed limestone would be a substitute? I try to avoid breaking things but maybe I need to knock off a chunk to get a look at the inside. Being a geology major and pouring my share of concrete you’d think I could tell but it’s so borderline, if it was any other shape id say absolutely limestone.