stone id ?

[Tyke]

This is the stone that is  all over where i hunt in utah this is all that i could get with out tools its all in about 100 lb boulders other than these small chunks plus i was deer hunting but it does have a conchodial fracture to it the pieces that i found that had chips out of them were like a toffee brown inside but werent worth taking. Heres some flakes i took off this morning

[JackCrafty]

Looks like a coarse chert or some kind of very hard limestone.  You might be able to make arrowheads out of it but I think knapping ceramic floor tiles would be easier.  Utah has lots of good, knappable stone.  Try and look for rounded or "amoeba" type stones with a cortex.

Here's a couple links:

http://geology.utah.gov/utahgeo/rockmineral/rockhounder.htm
(look at lower right area - near Capitol Reef Nat'l Park)


http://www.heraldextra.com/news/local/north/lehi/utah-valley-knapping-association/article_d4796e36-0695-11e3-b234-001a4bcf887a.html