Yeah mate, I like it.
I had to go to google to find out what lapilli was -
Lapilli is a size classification term for tephra, which is material that falls out of the air during a volcanic eruption or during some meteorite impacts. Lapilli (singular: lapillus) means "little stones" in Latin. By definition lapilli range from 2 to 64 mm (0.08 to 2.52 in) in diameter.
Wiki says 'little stones' - but Novo says they are 'large lapilli' - so I guess we know at least that they are stones which fell out of the air during a volcano or a meteor.
Let's hear from the Conference speakers.
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