Large imprint found in limestone

[Caroboneferous]

I found this huge cylinder imprint when I was out fossil hunting, it was too big to take with me, so I just took some pictures.  I was curious about it, I’m not sure if I’ve seen anything similar before?  Found on the Missouri River outside Kansas City.  Could it be a cast?  Or just a rock structure?  There looks to be a pattern imprint left behind.   About 1-1.5 feet long.   Sorry for the pics, I couldn’t take the specimen home as it was huge.

Edited September 3, 2021 by Caroboneferous

[Caverat]

I'd like to see a cross section of the "imprint" to see if it is perfectly round. The markings appear similar to the marks left by a drill to place explosives in a quarry. I hope I'm imagining that... 

[daves64]

Weathered Stigmaria cast?

[Rockwood]

2 hours ago, daves64 said:

Weathered Stigmaria cast?

I'd call it a mold, but it does look like one. 

Did it lay in roughly the same plain as the bedding. Lycopods didn't typically have a well developed tap root.

[Manticocerasman]

I agree with caverat, this is a drill hole. 

[Ludwigia]

Since these sediments are carboniferous, I wouldn't rule out a tree branch or root.

[supertramp]

29 minutes ago, Manticocerasman said:

I agree with caverat, this is a drill hole. 

 

or cast of expansive mortar imprint?

 

 

[Rockwood]

47 minutes ago, Manticocerasman said:

I agree with caverat, this is a drill hole. 

Wouldn't there be some indication of rotary, or plunging striations from the drill tool ? This seems to have a more plastic form to me. 

[Manticocerasman]

47 minutes ago, Rockwood said:

Wouldn't there be some indication of rotary, or plunging striations from the drill tool ? This seems to have a more plastic form to me. 

not always, it depends from the type of rock . It takes a lot of time drill those holes for extracting the rocks in the quarry, the rock is grinded by the drillhead so you mostly don't get a clear mark.

 

I took some pictures here at work from stones with simmilar drill holes, as you can see the marks left varry depending of the stone and the weathering of the stone slabs.

 

[Fossildude19]

I'm in the fossil tree branch/trunk mold camp.

I am seeing what appear to be diamond shapes in a large area of the item.

 

Pic 1 with contrast enhanced:

 

 

[Auspex]

3 hours ago, Fossildude19 said:

Pic 1 with contrast enhanced:

It might just be Stigmaria. I'd like to know, though, what kind of rock it's in.

 

[abyssunder]

Somehow, it reminds me of glass sponge.

Edited September 3, 2021 by abyssunder