Geopuzzle: What is this rock?
I received an e-mail from a reader asking my opinion about a rock they found and, as in previous occasions (e.g., here and here), I figured it would make a good Geopuzzle. I also recommend checking out Andrew Alden’s resources for identifying rocks over at About.com.
This one was found near Brandenburg, Kentucky. To be perfectly honest, this one is pretty difficult … I’d like to take a hammer to it to see if most of what’s highlighted in these photos is just surficial.
What do you think? Share your guesses in the comments below.