[Rockhounds] Mysterious Glass Beads in Clams Point to Ancient Meteorite Strike Near Florida

[Kreigh Tomaszewski]

Since their discovery 13 years ago, scientists have puzzled over the origin
of tiny glass beads found inside ancient clam shells. New evidence suggests
they’re microtektites—a byproduct of meteorite impacts—marking the first
time these celestial remnants have been found hiding in old clam shells.

Ancient clam shells uncovered at a Sarasota County quarry in Florida are
the unexpected repositories of microtektites, according to new research
<https://onlinelibrary.wiley.com/doi/abs/10.1111/maps.13299> published in
Meteoritics and Planetary Science. The research is still incomplete, but
the discovery points to a previously unknown meteorite strike (or strikes)
off the coast of Florida some 2 million to 3 million years ago.

https://gizmodo.com/mysterious-glass-beads-in-clams-point-to-ancient-meteor-1836636233