So, the picture makes it unclear, it could be a coprolite. It is blurry. Place it somewhere well-lit. A neutral background and press your focus button. Also, put a well known reference item like a ruler or a half dollar in the picture so we can get perspective on size. It wouldn't hurt to place two or three different aspects. Photos from different angles. These suggestions will make it easier to help identify it. Tell us what you know about where it was found. I found this rock in a dry riverbed near Apache Wells, Arizona. There were hundreds of rocks just like it. Simple enough and general.