Stone Inside A Stone?

[TJE]

These stones in a stone are from Northern Alberta Wapiti River system, found them to be Very strange..anyone know anything about these oddity's?

 

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[rock]

I wish I could get a closer look at the flat ones. The picture wont let me enlarge them. I was looking for use wear marks as indentations and swirls.

 

[StoneWhisper]

I guess this could and can happen.. sort of like moss grows on a rolling stone..

 

[TJE]

There doesn't seem to be swirls or indents on either side of flat one.

 

[TJE]

The Inner stones of both seem to have a mild draw to a magnet?

 

[Bajahunter]

TJE
What you have are called concretions. Do a web search, lots of info.
Can be made of many things, some are magnetic.
Some are formed around fossils.

 

[TJE]

Thanks for the tip Bajahunter.

 

[austin]

Found a fist sized rock with a smaller rock inside in Arizona. Was told it takes place in rushing rivers or igneous areas. Never really knew, but it happens...