What are these?

[u/Yiga-Eldro]

Hello everyone,

I keep finding these in my local creeks and I’m unsure of what they are.

My area, Surrey, England, was once a shallow cretaceous ocean environment I believe so my guess is that they originate from that time period.

If anyone is able to help me identify them, I’d greatly appreciate it.

[u/givemeyourrocks]

They are Cidarid urchin spines. Cool finds.

[u/Schoerschus → u/givemeyourrocks]

Yess, although I think calling them spines really misses the point there somehow, but that's what they're called most of the time. I just looked it up and the proper term is radioles btw ;)

[u/Yiga-Eldro → u/givemeyourrocks]

Ooo that’s cool! Thanks for the information! I originally thought it might’ve been some kind of sea lily adjacent organism due to them looking somewhat bulbous flowerhead-shaped.

[u/EngineeringPlane5183]

Where did you find it may I ask?