Schnetzler C. C. and Mchone J.F. (1996) "Source of Australasian tektites: Investigating possible impact sites in Laos," Meteoritics and Planetary Science, Vol.
The main evidence for the Alvarez hypothesis that a single impact resulted in the Cretaceous–Paleogene extinction event that killed the dinosaurs has come from the presence around the world of shocked quartz granules, glass spherules and tektites embedded in a layer of clay with extremely high levels of iridium, all signs of an asteroid impact.
He worked with Meade Instruments in 2005 to develop and create Meade’s MeteoriteKit, a special set of meteorites, tektites, and impactites.