Is it a flint fossil, impression or just another rock!

[BionicNeko]

I am an absolute amateur when it comes to this so do forgive me if I'm just posting photos of another rock! 

Found Worthing, West Sussex on the beach and the rock is flint I believe so usually I'd just be finding old echinocorys or the like around here.

It's fairly large, 6 inches across overall and does seem to have some lighter patches on it that aren't flint I don't think? making me assume it might not just be a rock that's tricked me into lugging it home for a closer look again (I'm the bane of my own existence).

Thank you so much for any help you can give with this one and my sincere apologies if I've been mistaken, but that's how I learn, right?!

 

Edited March 5, 2023 by BionicNeko

[rocket]

first thought: Looks like an echinoide inside, something like "Echinocorys" or like this. You see the see-urchins outer rim. but, 6 inch...., if it is an echinoid it´s the biggest one I have ever seen in flint.

Perhaps a sponge? Could you have a close look if you can see more details?

very interesting one

[BionicNeko]

Thank you so much for the reply! I have been having a look and taken a few more photos, it's got a very definite shape to its ridges but it's really got me scratching my head 

[digit]

Thanks for the clear well-lit images (with scale too)!

 

Definitely a curious object and one that many of us would have picked up to inspect closer. Hopefully, someone more familiar with the geology of where that object was found will chime in soon. The interesting band may be due to something biological or it could be some sort of mineral inclusion that was warped and deformed creating the tessellated cracked surface.

 

 

Cheers.

 

-Ken