I thought I'd post these pictures in the hope someone maybe able to shed some light on this rock or fossil. This piece was found while hiking over Jebel Harim in Oman. Jebel Harim is well known for it's fossils but I was on a hike and not specifically rock kicking! To give everyone an idea of the spectacular terrain and crazy geology, I've added two photos from the hike. The piece I'd like assistance with please is the semi circular shaped rock above the ruler. I found this on top of the mountain near the walking train and it was the unusual shape that caught my eye so I popped it into my pocket and it was only when I got back home did I take a closer look and realised it maybe something worth keeping. Sadly, that all I can add so if anyone has any ideas I appreciate any assistance?
Thanks
Paul