We have something very much like this in Arkansas, and similar giant spherical
concretions are know from a number of other places around the globe as well.
If the link below doesn't work, you can google the title.
MISCELLANEOUS PUBLICATION 22
SPHERICAL BOULDERS IN NORTH-CENTRAL ARKANSAS
by William D. Hanson and J. Michael Howard
http://www.geology.ar.gov/pdf/MP%2022%20Prim%20Boulders.pdf
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