re: Any OBers have an experience with quicksand?

Idk if this is quick sand or not but I was riding my four wheeler with my gf (no pics) on the Buffalo river one time after a rain and was moving along in like third or fourth gear and all of a sudden we sunk. Stopped me so hard I almost went over the handle bars. I jumped off and grabbed a big limb and jobbed into the ground and held the top of it and hooked the winch to it and it popped right out. I couldn't believe it came out, I thought we had a long arse walk ahead of us.