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Author Topic: Can someone help identify the orgin of this cross "+" in this strange rock?  (Read 4981 times)

Offline Mgretchen

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I found this conglomerate in the surf on a remote area of Avalon, NJ this past summer.  The rock appears to have a "+" symbol inside one of the stones pressed into the rock structure. I placed a pen in the pic for scale. This is very strange and I never seen anything like it.  Please advise if you have any ideas what it could be.

Thanks!

Mike



 

Offline CliffordK

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Either God has a sense of humor...

or you have found a fragment of glass/pottery/ceramic.

It could be either American or European in origin (or elsewhere).  The print doesn't look ancient.. so I'm thinking it can't be more than a few hundred years old. 

Looking at that more.
If brown was the natural color of the glaze on the ceramic.
And the (X) was a stamp.
Then white is where the glaze has weathered/worn through which accentuates the stamp.
I am having troubles understanding the surface irregularity.

Perhaps that is wrong...  perhaps the color was white, and the brown came later.  Thus, the cracked surface is showing up brown along with the depressions around the (X).
« Last Edit: 13/12/2010 07:19:11 by CliffordK »
 

Offline RD

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If not an artifact maybe a microfossil in cross*-section ...



the X appears to have bulbous extremities: like a bathroom tap (faucet) ...



or this ...

http://www.sciencephoto.com


[* pun not intended ]
« Last Edit: 13/12/2010 11:05:20 by RD »
 

Offline JimBob

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If the with rock is limestone then I suspect the cross is the result of a foramanifera - or a fusalinind if older than Triassic. (The later is likely since you found it on a NJ shore.)

What puzzles me is what is all of this set in, i.e., what is the black stuff? It looks like oil tar.

Then again, it could be a sport of nature set there to test our faith.    ;D
 

Can you give us a detailed description? Will either of the parts scratch with a sharp knife? Is the black stuff finely granulated and the compressed coal? (Will it leave a black mark?)
 

Offline RD

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On closer inspection it looks like it's bigger than it first appears ...

« Last Edit: 14/12/2010 12:09:09 by RD »
 

Offline JimBob

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And how big is that?
 

Offline RD

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And how big is that?

From the pen tip included for scale I'd estimate the full size (green line) is about 3mm across.
« Last Edit: 15/12/2010 14:44:14 by RD »
 

Offline Bored chemist

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I wondered if it was something like this
http://www.minerals.net/glossary/terms/a/asterism.htm
 but a fossil looks more likely.
 

Offline CliffordK

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I like the photo of the Radiolarian, although I think they may be a bit too small for what is observed.

I'm still leaning towards a mark on a ceramic. 

Can you tell if it has any 3-D texture?  Feeling with a finger, or doing a light paper&pencil rubbing?
 

Offline RD

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Some diatoms have cruciform symmetry ...


http://en.wikipedia.org/wiki/Diatom
« Last Edit: 29/12/2010 18:28:05 by RD »
 

Offline Foolosophy

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I found this conglomerate in the surf on a remote area of Avalon, NJ this past summer.  The rock appears to have a "+" symbol inside one of the stones pressed into the rock structure. I placed a pen in the pic for scale. This is very strange and I never seen anything like it.  Please advise if you have any ideas what it could be.

Thanks!

Mike



How old do you think it is? Any clues?
 

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