The ceramic artifacts in archaeological black earth (terra preta) from lower Amazon region, Brazil: Mineralogy

I had come across a blog chat about the paramagnetic forces that may be at work in the sherds found throughout TERRA PRETA alas had equipment malfunction and lost the site address and have not found it yet. But basically I think there is a premise*(1) for the sherds actually being bio-(magnetically?)active. Sort of a radiant regulator for various organisms in living soils.
I do not ascribe to the "whole" bio-dynamic theory (set apart from other organic agri-culture systems by its association with the "spiritual science" of anthroposophy by Steiner)*(3) but I DO accept that there is activity on a molecular scale that we do not and maybe never will fully understand. Thank goodness these activities are pretty benign and I do not have to wait till the scientists understand it all to use it in the garden.
Some of the biodynamics preps have bio-active ceramic particles in them. I have been adding crushed ceramic matter to my compost and microbial brews for a couple years and I turn out 200 lbs of amazing compost every couple of weeks. ... if it makes the microbes happy the soil will be healthier and plants grow with less man-made provisions.
Still I wish that blog would make this list somehow.

*(2) While seven different geophysical methods were applied, the "magnetic survey" reported here was particularly valuable.(searching for ancient hearths in Brazil) Magnetic surveys measure the earth's magnetic field very accurately. Buried ferrous materials, and in some cases, changes in bedrock lithology, produce disturbances in the local magnetic field that can be readily detected by magnetic surveys.(if researchers can find weak magnetic fields to chart sites of interest, microbes may also be sensitive to them for orientation to accomplishing their work... MHO)

*(1) http://www.hager-richter.com/mag.htm
*(2) http://www3.interscience.wiley.com/cgi-bin/abstract/102531616/ABSTRACT?C...
*(3)http://attra.ncat.org/attra-pub/biodynamic.html