#Rangeomorpha

Duncan McIlroy

@dmcediacaran.bsky.social

3 days ago

reconstruction of the seafloor at Inner Meadow with matgrounds and leaf like fractal Charnia brasieri in inferred life position (c)duncan mcilroy

reconstruction of Avalofractus abacus in life position a fractal like upright frond (c)duncan mcilroy

Possible Avalofractus abacus from Mistaken Point an originally upright fractal like frond

Charnia brasieri with a Trepassia sp. at its top both are fractal like stemless forms trepassia is narrow, brasieri is broad and leaf like

Yet another new #FossilFriday paper! This time just me, but building on work from the MUN Paleobiology Crowd over a number of years.
This OA paper outlines the lines of evidence used to determine mode of life of the #Ediacaran #Rangeomorpha. Always careful and objective we work with one

Duncan McIlroy

@dmcediacaran.bsky.social

1 month ago

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! 🧵

Duncan McIlroy

@dmcediacaran.bsky.social

5 months ago

Happy #FossilFriday, brought to you this week from the #Ediacaran Johnson Discovery Surface in Discovery UNESCO Global geopark. This lovely #Bradgatia like #Fractofusus shows the wonderful fractal-like branching of the #Rangeomorpha for your enjoyment. @discoverygeoparknl.bsky.social

Duncan McIlroy

@dmcediacaran.bsky.social

11 months ago

I like the first image which shows just how much surface area a single primary order branch likely had. I thought i would sculpt Charnia because it was more simple than some other #Rangeomorpha but man did it ever surprise me. this is the previous visualization of Charnia from brasier et al. 2012.

Duncan McIlroy

@dmcediacaran.bsky.social

1 year ago

for #FossilFriday here is a small #Trepassia from the #Ediacaran of Newfoundland. This is a very rare small specimen, most are 2m or so in length. Trepassia belongs in the #Rangeomorpha an extinct clade of fractal-like early complex macroorganisms