Hey folks, anyone here knows river tumbled petrified wood cause I don't, I was taking my dog for a walk in where the agua fria river in Maricopa county used to run if you look from satellite, the actual river know is maybe a 100 yards from where I found these, couldn't find anything like these in where the river is today, I looked for over an hour but I'm curious, they're all super heavy, hardness of 7 7 1/2, any help identifying would be much appreciated. Thanks in advance!