2. On the scale, does this mean the clasts get arbitrarily large for the known sample pool or is there a sort of maximum size assumed,...
Doug:
I don't know, but Dhofar 287, NWA 773, and Sau 169 are each dominated but one igneous (basalt in Dhofar 287, olivine cumulate in NWA 773) or pseudo-igneous rock type (crystallized impact-melt in SaU 169) with a minor regolith-breccia rock type attached:
http://epsc.wustl.edu/admin/resources/meteorites/dhofar287.html
http://epsc.wustl.edu/admin/resources/meteorites/nwa773.html
http://epsc.wustl.edu/admin/resources/meteorites/sau169.html
So, one interpretation is that each of these meteorites is really a regolith breccia with one immense clast. Perhaps the clast material is stronger than the regolith breccia material and survived the blast off, Moon-Earth trip, entry, and landing better.
"Clasts" like this do occur in the lunar regolith:
http://www.hq.nasa.gov/alsj/a16/AS16-106-17393.jpg
Randy Korotev
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