I've upped some ideas. I tried getting around to a logo respecting the full 3D look of the geological diagrams but my eyes hurt. :)
The overall look is messy, at least that's how I see it. The coloring, the lines .. make it look like that.
Instead, the designs above can easily be translated into monochrome designs, watermarks and on different backgrounds.
Curious to know what you think.
Andrei