I found these rocks in my pasture and was excited because I thought I had found some geodes. The rocks were in a sandy bank and looked like eggs sticking out of the bank. I am located in Ness County Kansas.
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Hi: Your rocks are not geodes but likely concretions. The wiki article even mentions concretions from Kansas though the concretions described don't to me fit what I see in the images. Better pictures and more description about the rocks would lead to better identification. See Better rock ID requests