I think, maybe, possibly I see a white/brown pair in the direct burial cable.. Not 100 percent sure, as the cable is not stripped back so I can tell. BUT if there is actually 4 pairs of good cat5 twisted direct burial cable there, you could get some ethernet out there. And 200 foot is very doable. I have run ethernet over the 100 meter spec with some loss of speed/reliability. It may not pass a test, but it still worked.
How about you use that rip string and get that black jacket and the copper/steel rodent shield off of that cable and get the pairs stripped back about 3 or 4 inches and take another photo. You should have a white/blue pair (white blue wire and a blue/white wire) and a white orange pair and a white green pair and a white brown pair. You can google for the hookup of 568b wiring protocol.
Yes you can punch them down on a good cat5 punch block and then punch down each end of a good 568b patch cord. Be careful that your patch cord is not using tinsel wire, or it won't punch in the insulation displacement prongs correctly.
To be honest 10/100 ethernet will work fine with just two pair of wire. Use pins 1,2 and pins 3,6 . I have done it plenty of times. Again.. not to spec, but will work. What is to spec and what you can get away with and make work is two different things.