Brian, indeed that link from Jim is one of the best I have seen to explain the geology of the sand hill region. But, follow links from that homepage to also learn of the plant biology and water resources. The university of Nebraska has some essays on various web sites that also have good info on the natural resources out there. One is the USGS stuff on the high plains aquifer, or Ogallala aquifer.
Old fashion research and internet searches should turn up all the geological terminology you can use in one essay. Why these processes are important to know is that routing a course over terrain where the substrata chracteristics for drainage and ground water movement and cylces of replenishment is known, can add tho the efficiency and consistent best uses of the resources to build and maintain the golf course.
The beauty of the Sand Hills is that generally there are from 50 to 100+ feet of great particle characteristic sand, some soilloam formation from plant growth and rebirth cycles with an abundant aquifer easily accessible beneath.