Terribly sorry for the very long hiatus, but I have returned with the next map in the series. 540 million years ago, during the Cambrian explosion and after an ice age (the Baykonurian glaciation, says the internet). Many things have gotten in the way of the completion of this map, but I hope to upload more often from now on. A best-case scenario would be a weekly upload schedule, but that probably won't happen. I have realised that some of the labels in the previous map are inaccurate, but you can probably extrapolate the (hopefully) correct labels from this map.