"Maybe there are 30 of them left, " said Mamadou Coulibaliy, who was bringing his cousin and her baby daughter - fast asleep and covered in dust - out on his motorbike.
The conventional explanation for this arrangement is that the glass fell to Earth first, then giant waves caused by the impact covered them with sediment, then iridium-containing dust settled out of the atmosphere over the course of a few weeks and formed the clay.