Dear Friends,
The press of other chores has kept me from responding to the addtions to this thread. I do thank you all.
Please let me also call your attention to a pair of posters on the scale mantle that were developed by my student colleagues. They present descriptive background and a bit of problem orientation to our investigaion of the mantle.
The posters are down at the bottom on my page (itself now dated).
http://www.unl.edu/anthro/afaculty/bleed.shtml
I hope you will find it of interest.
Again, than you for the interesting insights.
Peter