What is this rock?

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Offline Dan.Sj

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What is this rock?
« on: 08/01/2014 08:16:58 »
Could someone please identify these rocks found in northern Australia?

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Offline RD

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Re: What is this rock?
« Reply #1 on: 08/01/2014 10:46:44 »
Looks like concretions , e.g. ...

Quote from: newark.osu.edu
[attachment=18396]

Cannonball concretions, Sentinel Butte Formation, Upper Paleocene.
Little Missouri Badlands, North Unit of Roosevelt National Park, western North Dakota, USA.
http://www.newark.osu.edu/facultystaff/personal/jstjohn/Documents/JSJ-in-the-field.htm

 
« Last Edit: 08/01/2014 10:58:09 by RD »

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Offline Dan.Sj

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Re: What is this rock?
« Reply #2 on: 08/01/2014 11:14:39 »
Thanks for the info they definitely look like cannonball concretions.