Fossil Friday!

Last week on the Fossil Friday, I gave you a delicate crinoid that looked more like a doodle than anything that might have once lived! This week's fossil is similarly deceiving: it looks like a little footprint, but no, it was actually an animal. 

I won't give too much away, because I think you already know what it is! It looks so much like its living descendents we find today. What is this little creature, in which epoch did it live, and where do you think this particular specimen came from?

The first person to accurately identify this fellow wins bragging rights for the week!