re: I disagree for 4 reasons.
Tektites
Tektites are simply small glassy spheres of material. The glass is produced when rocks which are melted on impact, cool so quickly that crystals of minerals do not have enough time to form. The melted rock which forms the tektites is produced as a result of the high pressure and temperatures of impact. The energy of the impact causes some of the melted rock to be ejected from the crater where it coalesces into small spheres and then falls back down to Earth. The thickest deposits of glassy spherules are therefore found in locations closest to the impact site, however they can be transported as far away as 1000km from the crater.