Rock with unique markings

[LS1900]

I found this rock alongside a stream on our property. It's sizeable with a completely flat bottom and unique markings on the top. It struck me as man-made and not a natural occurrence. We live in an area with a rich Native American history and many arrowheads have been found within a couple thousand feet of this particular find. This rock may not have originated where I found it since the stream comes down from the mountain and is prone to serious flooding at times. I'm just wondering if I have something here and if so, what could it be?

 

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[kingskid1611]

petrified brain, looks like mine.....

 

[LS1900]

petrified brain, looks like mine.....

I'm sorry about your brain.

 

[tibortt]

Good one, kingskid! LOL.

 

[bigfoot1]

it looks like limestone stained with algea.softer intrusions have leached away leaving unusual shapes.my best guess

 

[LS1900]

it looks like limestone stained with algea.softer intrusions have leached away leaving unusual shapes.my best guess

Thank you!

 

[fowledup]

it looks like limestone stained with algea.softer intrusions have leached away leaving unusual shapes.my best guess

I was gonna say sandstone formed over a root mass

 

[Crispin]

definitely has the look of a petrified brain. I can easily see the frontal, temporal, parietal, and occipital lobes. Only problem is the lack of a central sulcus. However, the general sulci are prominent with obvious central wasting. CT scan will most likely show some white matter ischemia. I think we need a CT scan to evaluate for hippocampal size, possible pituitary adenoma, and discontinuity of the corpus callosum.

 

[Crispin]

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