Hi all,
Does anyone know of a function to plot a geologic time scale as a series of 
concentric circles on a circularly plotted tree?

As far as I can tell there are three available functions that can do this on a 
regular cladogram:

axisGeo (phyloch)
geoscale.Phylo  (strap)
geo.legend (phytools)

But none of these works with a circular tree, as far as I can tell. It 
shouldn’t be too hard to code this manually as a series of concentric circles 
(going try that now), but I figured I’d ask here in case someone has already 
done this.

Jake Berv
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