Best method; slice and dice, pathfinder ....?

[jclements]

So I am doing a geological section in which there are several layers/strata/zones with odd shapes (similar to a jigsaw puzzle).

I began by drawing the overall perimeter of the area and then drawing open paths depicting the common boundaries of the strata. Now I need to subdivide the overall perimeter into pieces so that each area can be given a specific fill.

I imagine there are different methods/tools to use to accomplish this so I would like to use the one that would be the quickest and easiest to use.

I will try and attach an example file which I began but have not finished.

Any tips would be appreciated.