Natural Resources, School of


Date of this Version



Transactions of the Nebraska Academy of Sciences (1984) XII: 65-69.


Copyright (c) 1984, R. F. Diffendal, Jr. Used by permission.


The occurrence of Quaternary anorthosite-rich sand and gravel deposits in south-central Morrill County, Nebraska, southeast of the mouth of Pumpkin Creek and south of the North Platte River suggests that the creek formerly flowed farther east than it does today. This eastern extension of the creek was abandoned when a headward-cutting tributary of the North Platte River eroded through the divide between Pumpkin Creek and the North Platte just east of Jail and Courthouse rocks, and captured Pumpkin Creek.