Imprint of a star within a circle on a stone

[non]

Hello, I'm from The Netherlands. (Excuse me if my English isn't perfect)

 

A few years ago I found this grey stone amidst the garden gravel near my house.

It was bigger and duller in comparison to the rest of the gravel.

When I inspected the stone I discovered that it wasn't so dull after all because on one side it had a small imprint of a star that appeared to be made out of tiny bumps and ridges that extend and surround the star itself in the shape of a circle.

 

I've always been curious to know what it is!

[Ludwigia]

That appears to be the imprint of a crinoid stem segment.

[abyssunder]

Roger was first!

Imprint of crinoid columnal facet.

Very nice! 

[Tidgy's Dad]

Yes, a very pretty and unusual example too. 

[tombk]

It could conceivably be the tip of a blastoid:

[Top Trilo]

The cast of a tip of a blastoid would not have the vertical walls around like a crinoid columnal. I agree with crinoid impression.

[Coco]

In addition to the origin and age of the terrain in which the fossils are found, size is also important for proper identification. I invite you to read my last link in my signature. If you don’t have a rule, print the document I made available and put your fossils on it before making your photos, making sure to leave a box with the apparent size (pedagogical message)

 

Coco

[BobWill]

If you have some modeling clay you could press it into the cavity for a better idea of what the original looked like. Like @Tidgy's Dad said, it is very unusual. I would love to see how it looked.

[DPS Ammonite]

6 hours ago, Top Trilo said:

The cast of a tip of a blastoid would not have the vertical walls around like a crinoid columnal. I agree with crinoid impression.

It also looks a little like an impression of an edrioasteroid:

 

https://woostergeologists.scotblogs.wooster.edu/2011/07/24/wooster’s-fossil-of-the-week-an-edrioasteroid-upper-ordovician-of-kentucky/

[Mark Kmiecik]

My first thought was echinoid, then blastoid. It just doesn't shout crinoid to me.

[non]

Thanks everyone! It does look like it's a crinoid columnal. 

But I was wondering.. could these be remnants of protrusions that would've run along the central grooves similar to what Arkarua adami has?

 

My dad suspects that the company we bought the gravel from got it shipped to them from Germany where it's taken from their mountains.

Because that's usually where it comes from.

 

PS. The pictures aren't set up properly because it took me awhile to get the details in shot.

I will try to update them by also incorporating a proper ruler as soon as possible. 

[Ludwigia]

1 hour ago, non said:

could these be remnants of protrusions that would've run along the central grooves similar to what Arkarua adami has?

I doubt that very much, since the stone would have to be Precambrian/Ediacaran and I don't believe there's anything like that in Germany near the Netherlands.

[BobWill]

7 hours ago, non said:

could these be remnants of protrusions that would've run along the central grooves similar to what Arkarua adami has?

 

 

I thought Arkarua was only found in Austrailia. Also notice the triangles are convex in yours and in the illustration whereas the ridge around them is convex in Arkarua but concave in your specimen. If your fossil is an impression of something I still think it would be helpful to make a clay cast from it to get a better idea of what the original looked like.

[doushantuo]

Hai,Non

zwerfsteen*,echinodermata,most certainly lower paleozoic

*erratic

crinoid columnals tend to be rare in erratics,BTW*

*the opinion of Johannes on that would be intersting,though

 

groetjes

Edited October 16, 2021 by doushantuo

[doushantuo]

There's a possibility it's a Dimerocrinites columnal

 

edit:pic added

Edited October 16, 2021 by doushantuo