Milbank, SD Milbank South Dakota, contains quarries that produce late Cretaceous (about 70 million years old) fossils. We find sharks teeth, bony fish, turtles, plesiosaurs and mosasaurs. Stephanie's field notes and sketches. TouGer, Doug and Stephanie look for fossils. Scott uses a brush to clean off a fossil he found. Here we are prospecting at Milbank. The fossils are found in the spoil pile, so we have to negotiate around big blocks of granite These are some shark vertebrae that were collected at Milbank.