Kennett went to Greenland and detected nanodiamonds, they were contested on the basis that there were not hexagonal nanodiamonds with claims that only lonsdaleite is indicative of impacts. Further research has refuted that claim, and nanodiamonds are not delivered in situ, they are created in the impact. In fact further research has concluded that the nanodiamonds are a mix of cubic, hexagonal, new previously unknown polymorphs and always accompanied by a mix of carbon sheet polymorphs, that transition nearly continuously to nanodiamond. The Madden found nanodiamonds in the sediments in Oklahoma, and completely independent secondary result that you insisted on deleting from the reference list. Now Kennett finds nanodiamond at half the sites, and studies them extensively. This has moved well beyond the primary into the tertiary.   

Get a life. I refuse to try and correct you here anymore.