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Author Topic: Who can tell me if I have a fossil or just a cool looking rock?  (Read 7772 times)

Offline gallasman

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We found a really weird looking rock.  My son's science teacher at school said it may be a fossil or just an unusual looking rock.  Is there anyone out there that may be able to tell from pictures?
« Last Edit: 31/03/2011 15:38:35 by gallasman »


 

Offline Jolly- Joliver

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A Paleontologist. A Geologist might be able to also.
 

Offline RD

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The area that looks like sets of rectangular teeth may be a mold of coral 

« Last Edit: 01/04/2011 03:22:44 by RD »
 

Offline JimBob

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mold[/url] of coral 

Naaa. That is a self-portrait Geezer made in his art class. The resemblance is remarkable!

It is a mud stone that, on occasion during formation of the layers, was dried out, causing mud cracks to form. Then along came another flow of water with mud suspended in it comes along, these mud cracks get filled.
the teeth are actually filled mud cracks. The layer in between was what filled the bottom set of cracks and formed another flat layer.

The whole stone was then solidified and slightly distorted.
« Last Edit: 02/04/2011 02:12:55 by JimBob »
 

Offline RD

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I'd like to change my vote to that of the Jimbob party.

So do the keystone shaped notches mean it should be this way up ? ... 



because the cracks in reticulated mud are wider at the top.
« Last Edit: 02/04/2011 03:53:20 by RD »
 

Offline Geezer

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Naaa. That is a self-portrait Geezer made in his art class. The resemblance is remarkable!


Right! That does it. We've been watching you for a while laddie, and we can't tolerate this kind of crap any longer.

In future, you will kindly refer to H.R.H.Geezer as H.R.H.Geezer.
 

Offline chris

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Fascinating explanation; thanks Jim.

Chris
 

Offline Bass

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While I agree with JB for the most part, I'm curious as to the mineralogy of this specimen.  The gaps in the "teeth" appear to be micaceous, or clearer quartz or calcite? 

Welcome to the forum gallasman!  Can you scratch the surface of the specimen with a knife, and if so, how easily?  Can you give us a better description of the gaps in the teeth?  does it look like mica?  metallic?  Does the specimen fizz at all with a drop of acid (dilute hydrochloric acid is best, vinegar will also work)?
« Last Edit: 02/04/2011 16:29:25 by Bass »
 

Offline gallasman

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Thanks for all of the replys.  We're far from scientists in this house so my explanations are probably not going to help much. The entire rock is fairly consistant in feel.  I could not scrape it with a knive.  It just put little marks on the rock.  Nothing of substance came off. I dont know what mica looks like, but there doesn't appear (to me anyway) much difference in the gaps from the rest of it.    In between the "teeth" looks like the rest of the rock.  I put distilled white vinegar on it and nothing happened.
« Last Edit: 02/04/2011 18:07:39 by gallasman »
 

Offline JimBob

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Quote
In future, you will kindly refer to H.R.H.Geezer as H.R.H.Geezer.

His Royal "Hindquarter" Geezer - got it! 
« Last Edit: 02/04/2011 18:46:47 by JimBob »
 

Offline JimBob

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Who can tell me if I have a fossil or just a cool looking rock?
« Reply #10 on: 02/04/2011 18:44:03 »
Bass - open the second picture on the original post on this thread, img006.jpg, It shows a clearer rock - with obvious crossbedding in the upper right quarter. 
 

Offline JimBob

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Who can tell me if I have a fossil or just a cool looking rock?
« Reply #11 on: 02/04/2011 18:50:50 »
Quote
In future, you will kindly refer to H.R.H.Geezer as H.R.H.Geezer.

His Royal "Hindquarter" Geezer - got it! 

Or should we make that plural - half arsed?
 

Offline yor_on

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Who can tell me if I have a fossil or just a cool looking rock?
« Reply #12 on: 03/04/2011 05:26:35 »
It scares me.
Looks too much as my dentist, smiling..

(Eh, not that I have one, smiling..)
 

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Who can tell me if I have a fossil or just a cool looking rock?
« Reply #12 on: 03/04/2011 05:26:35 »

 

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