Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: John Cen on 12/11/2015 14:23:47

Title: Any ID on this rock?
Post by: John Cen on 12/11/2015 14:23:47

Hey guys,

I noticed this rock was causing some ID problems on another website and was just wondering if anyone knew what it was?

(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fpuu.sh%2FliMQi%2F5b350211ff.jpg&hash=7040212ff0377c9332b4c5452519b0d5)
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fpuu.sh%2FliMPD%2Fac00ece69e.jpg&hash=2c5e81e2631fb52f44641f31f5751e45)



Thanks,

John

Title: Re: Any ID on this rock?
Post by: RD on 12/11/2015 18:58:42

 [ Invalid Attachment ]

The regular cell pattern, ( somewhat like dimples on a golfball) , makes it looks like [fossilized] coral ...
(https://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Rafinesquina_ponderosa_%28Hall%29_ventral.JPG/594px-Rafinesquina_ponderosa_%28Hall%29_ventral.JPG)
https://en.wikipedia.org/wiki/Tabulata (https://en.wikipedia.org/wiki/Tabulata)

Title: Re: Any ID on this rock?
Post by: John Cen on 12/11/2015 19:06:58

Thanks for the help, maybe Stromatolite?

Title: Re: Any ID on this rock?
Post by: RD on 12/11/2015 21:43:31

Quote from: John Cen on 12/11/2015 19:06:58

... maybe Stromatolite?

I don't think Stromatolite has regular arrays of large cells like tabulate coral (https://www.google.com/search?q=tabulate+coral+favosites&prmd=ivns&tbm=isch&tbo=u&source=univ&sa=X&ved=0CCEQsARqFQoTCNOjo8Dti8kCFYY3FAodCZEBBw).

 [ Invalid Attachment ]

Title: Re: Any ID on this rock?
Post by: John Cen on 13/11/2015 01:04:38

Great!

Thanks for the help,

I was also given another suggestion that it could be  type of onyx (like chalcedony that forms layers)

Title: Re: Any ID on this rock?
Post by: Bill S on 13/11/2015 22:20:03

A hardness test should sort the coral from the chalcedony, unless, of course, the calcite has been replaced by silica. [:)]