Clay mystery disks

[reefguy05]

Can somebody identify what these disks are and what they were used for? They are made of clay. Found at about 20 ft in the CT river. They have been there long enough so that several are fused together and many are worn by current. The larger one has a stone pressed into it causing it bulge the other side which means it must have been under a constant pressure for some time.

 

[fdog]

Looking at the larger one, my first thought was clay pigeons. The others appear to be too small, though.

All the best, James

 

[ScubaSarus]

Ahh concreations I think. We were looking for some under the bridge. Were did you get these? They are neat and from years of erosion I think. Keep a few they are neat to have and make good conversation pieces.

 

[ScubaSarus]

Concretions is the right spelling
Check em out here in the CT River geography page.


http://www.bio.umass.edu/biology/conn.river/hitchcock.html

 

[dbg40]

Ahh concreations I think. We were looking for some under the bridge. Were did you get these? They are neat and from years of erosion I think. Keep a few they are neat to have and make good conversation pieces.

Chris,, you crack me up! You can come up with the most obscure damned knowledge. unbelieveable!!!

 

[RIOceanographer]

Ahh concreations I think. We were looking for some under the bridge. Were did you get these? They are neat and from years of erosion I think. Keep a few they are neat to have and make good conversation pieces.

Just to clarify what Scubasarus is saying, they are probably naturally formed concretions, not man-made. The CT river is full of them. Concretions form when you have some kind of nucleus around which a mineral like calcite or iron oxide are deposited (from the reddish-brown color yours appear to have some iron oxide in them). They tend to form nice oval or spherical shapes.

edit:
Looks like he clarified himself before I did! Doh! I post too slow.... nice link btw.

 

[abitton]

Scubasarus, I'm really impressed!!!

Alex

 

[Riwrecker]

I never dove the CT river but i saw clay object like that at a dive shop in Ct. The shop did charters some where on the river and search object like the ones found.

 

[ScubaSarus]

Well thanks there Dave and abitton. Oh by the way Dave are you and Chris Ctmax up for a Westhill Lake dive soon in the coming weeks.

 

[MSilvia]

You learn something new every day.