  The ingress of micrometeorites of cometary origin with densities below ~ 1 g
cm-3 into the Earth could average at least 5 tonne per day. Although much of
this is burnt upon entry through the atmosphere as meteors, a non-trivial
fraction (~10%) which have sizes of ~ 1 m could end up in the form of
Polonnaruwa-type meteorites that have mostly gone unnoticed.
