My sister found this fossil/rock. Any ideas what this came from? Could it have any value?
Is that aquatic corral? Doesn',t look like ammonite shell to me, no ridges on sides and doesn,'t have the correct decreasing circumference in it,'s curvilinear shape.
I am going to guess bleached coral. See https://snorkelaroundtheworld.com/2020/10/dead-coral-why-are-they-dying/