First post on the forum but figured this would be the best place to get some information. I found this "rock" yesterday while checking a bean field near Scottsbluff, NE. I'm an agronomist so I spend all summer wandering around in cultivated fields and this is the first "rock" of this nature I have found (lots of fossils in the area but usually just toe bones, vertebrae, etc...) Upon inspection it appeared much different than anything I've ever found. Unfortunately it looks to hat been hit with various farm implements over the year which has left some chunks missing. After researching online, I concluded that it may be a fossilized egg of some sort due to the shape and the cracking pattern. What do the "experts" think?
Another image