The lumps are glauconite nodules. But the best part is still unfolding. It seems very likely that these are transformed trilobite coprolites.
International Space Station 400 mm Photograph
Image credit: Image Science and Analysis Laboratory, NASA Johnson Space Center (http://eol.jsc.nasa.gov)
CONECUH RIVER, ANDALUSIA ≈31.30N, ≈86.48W
The link is to the Wikipedia page on Andalusia.
ZERO MAGNIFICATION
1X* MAGNIFICATION (YELLOW LINE = 2 MM)
3X* MAGNIFICATION (YELLOW LINE = 1MM)
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