Image:KansasPopRock1.jpg

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[edit] Iron Sulfide Concretions

Description	Typical examples of iron sulfide concretions, called “Kansas Pop Rocks”, which are found in the Smoky Hill Chalk Member of the Niobrara Formation of Kansas. Both regular, lefthand row, and polycuboidal, righthand row, varieties shown in picture. These concretions are about 3 centimeters in diameter.
Source	self-made
Date	March 10, 2008
Author	Paul Heinrich
Permission (Reusing this image)	See Below
Other versions	None

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