Hi Tom,
Ask me specifics and I will give you them, as this is our first choice for any
project.
If you want to get great info online...
Learn to do "advanced searches" in other languages besides English, and look to the vernacular of traditional, or historical architectural foundations. Yet again you must ask specifics not the open broad term "foundation," For example Ishiba 根石. If you place "ishiba date" in quotations in google that is one step toward an advance search and it will bring you to several links including
this one. If your take the kanji 玉石基礎 or 柱が石の上に that will get you even more information. This is just two of thousands in your query for natural foundations.
Regards,
j.