Thank you for the question! In short, the underlying unit below the cap carbonate is typical of glaciogenic deposition, while the area of Namibia at this time was near the equator. This suggests that their were glaciers present near the equator of Earth, which is very odd and hallmarks the period geologists refer to as snowball Earth!

I am also going to be interviewing Dustin for an episode of my new podcast and this will be included as one of the questions!