Many dated deposits at the Spanish cave art sites contain rock particles from external sources that can throw off age estimates. (sciencenews.org)
A beach or strand is a geological formation consisting of loose rock particles such as sand, shingle, cobble, or even shell along the shoreline of a body of water. (sciencedaily.com)
Cassini's cosmic dust analyzer (CDA) instrument repeatedly detected miniscule rock particles rich in silicon, even before Cassini entered Saturn's orbit in 2004. (astrobio.net)