red is the Avalon assemblage the chart shows diversity (dark prior to this paper and lighter including our data. note that it ranges to the end of the dark blue White Sea Assemblage and many of those taxa go extinct at the junction with the Nama Assemblage at 550Ma

The Avalon Assemblage has not been a big part of that story. The weird and wonderful #Rangeomorpha and #Arboreomorpha of Avalonia were thought to have gone extinct at 560 Ma ish so not part of the main narrative…
But as of today that narrative is no longer true! 🧵