Strange Markings on Rock?

[Zenmaster6]

At Titlow Beach Washington state (Eocene) I found this weird pattern. probably just minerals or something strange but I still wanted to be sure.

 

It came from under a rock we chipped the top off.

 

 

 

[ynot]

These look like trace fossils.

Burrow or feeding marks left by ancient creatures.

[DPS Ammonite]

Those holes look really round. It looks like that it may be concrete/cement/plaster that hardened against some plastic or material. The wrinkles may also be where the material flowed or wrinkled before it hardened.

 

Show own us a photo of the whole thing.

[Rockwood]

If the marks corresponded more closely with the holes I would be in the feeding trace camp. The randomness spells tool markings (in the geological usage) to me though. Objects being thrashed by waves being the cause.

[abyssunder]

This one looks like a tube worm.

 

[Rockwood]

1 hour ago, abyssunder said:

This one looks like a tube worm.

Studying it's placement does seem to indicate that the two surfaces were roughly contemporaneous and perhaps a rich enough organic deposit to have this much chaotic feeding going on. 

[Zenmaster6]

5 hours ago, abyssunder said:

This one looks like a tube worm.

 

I wish I could give you x5 I found this informative. That was quite the eye you had there. Awesome observation. 

[Rockwood]

1 hour ago, Zenmaster6 said:

I wish I could give you x5 I found this informative. That was quite the eye you had there. Awesome observation. 

I gave him one for his brain. Mine was so focused on the traces it wouldn't let me look for something like that.

[abyssunder]

20 minutes ago, Rockwood said:

I gave him one for his brain. Mine was so focused on the traces it wouldn't let me look for something like that.

[abyssunder]

There are a lot of traces, nicely aligned borings perpendicular to the surface, and possibly grazing traces parallel to / on the surface.

[ynot]

2 minutes ago, abyssunder said:

There are a lot of traces, nicely aligned borings perpendicular to the surface, and possibly grazing traces parallel to / on the surface.

That is what I see in this piece.

 

@Zenmaster6

Would like to see more pictures of the whole rock and some close ups.

[Zenmaster6]

Unfortunately this was a boulder and 25 miles away from my house. If I ever go back I will upload the photo here

[abyssunder]

6 hours ago, Rockwood said:

Studying it's placement does seem to indicate that the two surfaces were roughly contemporaneous and perhaps a rich enough organic deposit to have this much chaotic feeding going on. 

You might be correct, Dale.
I would call this competition (of chiton, worm, sponge, echinoid, etc.) and successive colonization of the hard substrate in bioerosion.

[Plantguy]

Yes another interesting picture!  Would love to see some more photos if you ever get the chance to go back. I agree with the others there are some really neat traces and am wondering since we already were discussing barnacles in the other post if there is some similar evidence of them being in this photo as well. What's the scale of your picture?

 

Here are some additional examples of an approximately 5cm wide barnacle and a picture of its base and a closeup comparison of your photo and of another larger barnacle section that seem to have similar textures/structures. 

Cool stuff. 

Regards, Chris