This is the Bearpaw Shale. It is a marine formation made of mostly shale and was deposited roughly 74 million years ago. It doesn't look like much from a distance, but once you get closer there's a lot to be discovered.
Here's one of the locations I dug to find fossils. It was actually alongside a four wheeler trail. Who knows how many people have passed this site by without knowing what awesomeness it holds!
This is where I dug and found some awesome fossils!
Two of the ammonites that I found in the Bearpaw Shale. It took a little digging to find them but it was well worth it!