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Collected at Dunedin causeway in Florida. I thought possible echinoid. If not, I’m cutting it open to look inside. Thanks!

Found this amongst some rocks and Agatized Coral at Dunedin Causeway in FL. Can anyone confirm that it's actually a fossil? And not just a modern cement mixer or something?! Pretty sure it is a fossil! Thanks

Hey guys. In NZ we have quite a few volcanoes, and luckily for me living in christchurch, the most recent eruption in the south island was about 20 mya. On the "vanished world" trail, there is a preserved basaltic volcanic dyke/sill that has been injected into the strata beneath an ancient lagoon. While I'm aware that these magmatic intrusions don't break the surface, there is a broad fossil horizon not far from the top most termination of the sill, with beautiful small spirulla (?) (Some kind of elongate fossil snail) preserved in the rock. I was wondering, that as I mentioned before that this fossil horizon is not too far from the intrusion, just how much heat or mineral replacement does it take for igneous rocks the the associated hydrothermal minerals to completely destroy/deform/disfigure fossils in these kinds of geologic environments? I have included a rough sketch. Like all great geologic exposures, it occurs at a public road cutting, to provide context.

Hi all, I took my Mom to lunch at Frenchy's Dunedin, Florida and than took a walk on the Causeway. I found this unusual piece that I was going to toss but kept it. It is about 3" by 2" by 2" and looks like granulated brown sugar with crystals (I think sandstone) under the eye loop. It appears to have about 4 shell casts on top with some of the seashell still embedded in the layers. On top it looks like a turtle with its head sticking out?? There is a dozen or more shell molds or imprints all over this conglomerate of sediment. What do you think of this find? Is it considered a fossil? Thanks in advance!

This is an interesting shape find. It is about 1 1/2" at it's widest point. It has a round crater in the middle with coral polyps marks and circular bands around it. I see microcrystalline when exposed to the sunlight. I think I found this on one of the small islands in Dunedin Florida, boating. I've seen many forms of corals but I never seen one like this. What do the experts think? Thanks!