sandstone

Hello all, I work for a local quarry, and I often find deposits in the PA sandstone that look like this. My boss wants me to figure out what it is. It is not magnetic. I also might add, it is very heavy compared to normal sandstone. Thanks!

Wondering what you guys think about this artifact. I've been told it's a plowtip. It's made of sandstone, and everyone I've took it too gives me a different estimate on it's age. One man said it's most possibly from the paleo stage. I don't really get to far with it down in the boonies where I'm...