I found this rock, shaped like a mushroom, and I'm skeptical that it was carved, but how else would it have been shaped this way?

[BABALONGOGGLES]

The cap part has a slightly concave surface which feels rough compared to the rest of the cap. I really doubt it's a native American artifact, but I'm a little bit baffled by it, so here it is. Found along a river in Eastern Washington State. I'm not knowledgeable about Native stone artifacts, so I'd love to know if it's just a weird rock or something that was deliberately carved. Pretty heavy, and I carried it about a mile to put in my yard. The other rock is really dark green with veins, super polished. Very dense. I just liked it, but I'm curious if anyone has any thoughts on what it might be. Hard to see the green in the picture.

 

Amazon Forum Fav 👍

A Handbook of Civil War Bullets and Cartridges - Grab it through Amazon!

[pepperj]

If you hadn't stated it was a rock, I would of said #4 photo looked like a smashed bullet.
Pretty cool piece either way.
I would just put it into the the category of nature/water flowing over it, for a few megaannum

 

[Blackfoot58]

If you hadn't stated it was a rock, I would of said #4 photo looked like a smashed bullet.
Pretty cool piece either way.
I would just put it into the the category of nature/water flowing over it, for a few megaannum

Yes, it very much looks like a huge, mushroomed bullet. It should be a good addition to any yard art area. Probably caused by friction/erosion as pepperj said.

 

[Groundhogg]

Mother nature is amazing....cool find!

 

[iAmMike]

Quite an interesting specimen. Hopefully a geologist will chime in on it.

 

[Georgivs]

The river I frequent has a lot of "anchor stones" where there is a thinner piece of stone sandwiched between two wider pieces, like your stone but more like a barbell. It happen when a softer type of stone erodes faster than the piece on either side. I've found them like yours, but with caps on both ends, but also shaped like slice of cake, and more commonly oblong more like a sub sandwich. But who's to say native Americans didn't take advantage of natural formations like that?