what are those ?

[fifbrindacier]

Hi, i found several of those items with an equivalent pattern on them and since months, i don't find a clue on them. Has someone got an idea ?

 

1) : 6 cm long on 1,5 wide :

 

[fifbrindacier]

2) 10 cm long, 3 wide :

[ynot]

Look like coprolites.

Let's see what @GeschWhat and @Carl think.

[fifbrindacier]

[Manticocerasman]

I was also thinking coprolite.

 

[fifbrindacier]

3) :

[fifbrindacier]

That was one of my pist, along with Oyster or burrow. I abandoned quickly the pist of rudists because i can't see the three column pattern on them.

[Carl]

How old are these? And from where? I guess they could be coprolites but I'd like a few more details to be fully convinced.

[abyssunder]

Can we have views of the wider ends?
Have they a spiraling or concentric character?

[fifbrindacier]

14 hours ago, Carl said:

How old are these? And from where? I guess they could be coprolites but I'd like a few more details to be fully convinced.

They're campanian-maestritchian, so, about 72 Million of Years. In the tags i wrote France, but i didn't said : South-West, i can't give a more precise localisation.

 

14 hours ago, abyssunder said:

Can we have views of the wider ends?
Have they a spiraling or concentric character?

I'll take pics tomorrow.

[fifbrindacier]

Ends of item 2) :

[fifbrindacier]

Ends of the item 3) on the left :

[fifbrindacier]

Ends of the item 3) on the right :

[Carl]

I think they are pretty strong candidates for coprolites. And that last photo looks like it might have a bony inclusion inside.

[GeschWhat]

In one of the photos you showed one in the matrix. It looks like the material on that one is the same as the matrix. If that is the case, I would lean more toward burrow. 

[fifbrindacier]

1 hour ago, GeschWhat said:

In one of the photos you showed one in the matrix. It looks like the material on that one is the same as the matrix. If that is the case, I would lean more toward burrow. 

When i wet it the colour of the item is less clear and a little different than the rest of the rock.

[caterpillar]

No coprolites for me, just burrow. Normally when you find coprolites you find also vertebral material (which make coprolites) and I think you don't find vertebrates

[abyssunder]

To me, it's a visible outer rim in cross section of all of  specimens, which may lead me to think that they may be weathered borrows.

My examples below shows what I think, but it was recovered from Miocene sediments of Romania.

 

 

 

[Darko]

It looks like a coprolite, but also looks a bit like a worn coral

[fifbrindacier]

No, it's surely not a coral. I agree they are good candidates also for Burrows, if so i Wonder which kind of animal could have made them, but i well know this is something difficult to be sure of.

 

Thanks to all for your participation, that's a great forum with a lot of knowledge to learn.

[caterpillar]

Echinids, crabs, fishes can built burrows

[fifbrindacier]

Yes, sure, the question is open and that pleases me a lot.

[Plax]

has anyone proffered sponges as an ID? Your early pictures seem to show cyclic laminations. Am not sure I've seen a burrow like that. I have seen laminate coprolites but these don't look like that either.

[fifbrindacier]

That's what made me wondered what those could be, those laminate structures. And as you can see, there are "horizontal" striations and "vertical" ones.