""Leaverright," beautiful specimens!" As Terry Solomon said, as in "leaver right there."
I personally think the round one is a petrified dinosaur egg.
You could use the round one for a paperweight or a doorstop, perhaps.
Ok enough joking.
They don't look to be much of anything that you'd get excited about. Sometimes you
need to crack them open or knock off a bit to "see inside" the rock. On a field trip here
in the desert, we were looking for agates... expecting them to be nice and shiny... but they
had a crust on them, that most people would just kick aside. It was not until you cracked
them open, that you did see the fine delicate lines and banding. Then when they were cut,
shaped and polished they made nice pieces for jewelry.