rock identification

As I walked past this, i thought it was a monster turtle! Anyway, i think this may just be a unique variant of what my parents always call "kettle rocks" or "widow makers" but im unsure. Y'alls input would be greatly appreciated!

I found this Rock about 20 years ago when I was a child in an area in Pennsylvania where they were digging up a foundation for a new house. I have always wondered what kind of rock it is, but could never seem to find any good leads. I would appreciate any help.

http://www.treasurenet.com/forums/hard-rock-mining/348469-got-rock-you-want-identified-post-here-gimme-good-picture-3-4-a.html Just a good spot to see if you have a rock that's unique or if you have a question.. Have fun and may you find the GOLD!

http://www.treasurenet.com/forums/hard-rock-mining/348469-got-rock-you-want-identified-post-here-gimme-good-picture-3-4-a.html Just here for the Rocks y'all have questions on!