Help ID and learn

[outdoorhiker]

I’m tilling some land for my garden and have been digging up basketball size rocks (the pile) all coming from the same area. Then I discovered this big one, with odd angles, and had to ask: is this my gift from past glaciers, possible old foundation, or probably a 20 year rock pile on edge of yard (although not the same uniformity of rest of moved dirt/ rock) when house foundation was dug.

If anything, am curious on the type of rock and its likely story/geology- if I would be wrong to break away the upper portion. I’m located in central Alaska and am using this rock as an intro to my geology skills. Thanks!

 

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[Kray Gelder]

Probably a glacial drop, not one that ground along under the ice. I can relate to what you're doing, trying to find soil in all that glacial till. Good luck. Don't wreck your back.

 

[DDancer]

I agree with Kray, a drop. As to what type of stone it is your curious about its kinda hard to say. It looks like its sedimentary, very compact, and hard so a high silicate value. Sedimentary rocks often break apart at sharp angles and flats due to the layered way they are formed. Those boulders your pulling might make a good fence and you could use the angled one for a corner stone. A thought. Luck with the sifting.