As can be seen in Fig 16, dolerite has a high percentage of centripetal and subcentripetal scar patterns (~36%), which makes sense with Levallois or discoidal strategies.

Carbonados are polycrystalline diamond aggregates of generally irregular shapes that have been observed in placer deposits and low-grade metamorphic rocks of mainly Brazil, Russia, South Africa, Ukraine, Venezuela, and the Central African Republic. […] Smith and Dawson (1985), consequently, suggested that carbonados could have been formed as a consequence of Precambrian impact events into carbon-bearing crustal rocks. All other traces of these impacts and the related impact structures apparently have been eroded, and only the carbonados had survived erosion and were then incorporated into sedimentary rocks.

Everything in my life is okay except I have this terrible problem with my sister Shannon. I'm spelling her name the way most people would. She spells it Sionna ever since the priest told us that's the real Irish way to spell it. It's the name of a river and a goddess. Shanny doesn't think she's a river. She's really Shannon Marie.

To have demolished and rebuilt the walls, would have been a very costly expedient, and as the least of two evils, the painter's brush was resorted to; here and there however, above some of the windows, the black wreathings of the smoke are still discernible through the white covering.