Really cool karst conversation with hydrogeologist John Caire.
"The karst terrain of the Ozarks means there is ALWAYS a river under the river. Every time we float the river and cross a pool to a riffle, you're seeing the karst in action. The pool usually sits on top of a solid block, termed a Horst. The riffle is at a junction that is either a fault or joint line that denotes the next Horst block. Isn't geology neat? :)"
"When you get to those shallow pools, then a deeper... pool on the other side of the riffle, that's the water going under the block laterally and then resurfacing at the riffle. Much easier to spot on the Buffalo since it's been protected for so long. The riffles usually coincide with a drainage cut through a bluff as well, if the bluff can be seen from the river while floating. Lots of neat geology happening on the Kings."