Bob Diffendal is a geologist and professor emeritus in the School of Natural Resources. While he formally retired in September of 2003, he remains quite active in the School and University, particularly in writing and public speaking about Earth science. His specific research interests have to do with the geology of western and north-central Nebraska; Upper Paleozoic, Mesozoic and Cenozoic geology, mostly in Nebraska, and invertebrate fossils.

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2016

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PUBLICATIONS AND OTHER WORKS BY R. F. DIFFENDAL, JR., Robert F. Diffendal

2015

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Review of A Garden of Marvels: How We Discovered that Flowers Have Sex, Leaves Eat Air, and Other Secrets of Plants, by Ruth Kassinger, Robert Diffendal Jr.

2014

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Some Reflections on Our Experiences at Sun Yat-sen University Since 1985, Robert F. Diffendal Jr. and Anne P. Diffendal

2012

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Geologic Observations along the Steamboat Trace Trail, Markers 16-20, in the Vicinity of Peru, Nemaha County, Nebraska (Including on the Indian Cave Sandstone), R. F. Diffendal Jr.

2011

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Great Plains Research: A Journal of Natural and Social Sciences with accompanying map, Robert Diffendal, Jr.

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Great Plains Research: A Journal of Natural and Social Sciences with accompanying map (2), Robert Diffendal, Jr.

2008

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GEOLOGIC MAP OF THE O'NEILL 1º X 2º QUADRANGLE, NEBRASKA, WITH CONFIGURATION MAPS OF SURFACES OF FORMATIONS, Robert Diffendal, Jr.; Michael R. Voorhies; E. Jane Voorhies; H. E. LaGarry; C. L. Timperley; and M. E. Perkins

2006

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Great Plains Research Journal, 16:1 (Spring 2006): Front and Back Matter, Robert F. Diffendal

2005

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Vertical Movement of Water in a High Plains Aquifer Induced by a Pumping Well, Xunhong Chen, Yanfeng Yin, James W. Goeke, and Robert F. Diffendal

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Vertical Movement of Water in a High Plains Aquifer Induced by a Pumping Well, Xunhong Chen, YanFeng Yin, James W. Goeke, and Robert F. Diffendal

2004

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LETTER FROM THE EDITOR, Robert F. Diffendal Jr.

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Ogallala Aquifer, Robert F. Diffendal

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Topographic Maps, Robert F. Diffendal

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Keith County Test-Hole Logs: Nebraska Water Survey Test-Hole Report No. 51, Robert F. Diffendal Jr. and James W. Goeke

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Lewis and Clark State Park Signs, Robert F. Diffendal and Les Howard

2003

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Lewis and Clark and the Geology of Nebraska and Parts of Adjacent States, Robert F. Diffendal and Anne P. Diffendal

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Lewis and Clark and the Geology of the Great Plains, Robert F. Diffendal and Anne P. Diffendal

2002

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Field Guide to the Geology of the Harlan County Lake Area, Harlan County, Nebraska — with a History of Events Leading to Construction of Harlan County Dam, Robert F. Diffendal, Duane R. Mohlman, Richard G. Corner, F. Edwin Harvey, K. J. Warren, Scott Summerside, Roger K. Pabian, and Duane A. Eversoll

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Structural and Geomorphological Evolution of Huangshan (Yellow Mountain), Anhui Province, China, Pei-Hua Huang, Robert F. Diffendal, and Ming-Qing Yang

2000

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Arthur County Test-Hole Logs: Nebraska Water Survey Test-Hole Report No. 3, Robert F. Diffendal Jr. and James W. Goeke

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Keith County Test-Hole Logs: Nebraska Water Survey Test-Hole Report No. 51, Robert F. Diffendal Jr. and James W. Goeke

1999

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Reconnaissance Survey of Lewis and Clark on the Missouri National Recreational River, Nebraska and South Dakota, Anne P. Diffendal, Gary E. Moulton, Michael Shambaugh-Miller, and Robert F. Diffendal

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Cheyenne County Test-Hole Logs: Nebraska Water Survey Test-Hole Report No. 17, Robert F. Diffendal Jr.

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Deuel County Test-Hole Logs: Nebraska Water Survey Test-Hole Report No. 25, Robert F. Diffendal Jr.

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Geology of Rock Creek Station State Historical Park, Robert F. Diffendal

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Mountain Evolution and Environmental Changes of Huangshan (Yellow Mountain), China, Pei-hua Huang, Robert F. Diffendal, Min-qing Yang, and P. E. Helland

1998

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Mountain Evolution and Environmental Changes of Huangshan, China, P.-H. Huang, Robert F. Diffendal, M. Yang, and P. E. Helland

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Antelope County Test-Hole Logs: Nebraska Water Survey Test-Hole Report No. 2, Sue Olafsen Lackey, Frank A. Smith, and Robert F. Diffendal Jr.

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Holt County Test-Hole Logs: Nebraska Water Survey Test-Hole Report No. 45, Sue Olafsen Lackey, Frank A. Smith, and Robert F. Diffendal Jr.

1997

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Geology, Robert F. Diffendal

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Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska, Robert F. Diffendal Jr.

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Ground Water, Robert F. Diffendal

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SEM Analysis of Quartz Sand Grain Surface Textures Indicates Alluvial/Colluvial Origin of the Quaternary "Glacial" Boulder Clays at Huangshan (Yellow Mountain), East-Central China, P. E. Helland, Pei-Hua Huang, and Robert F. Diffendal

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Geologic map of the Scottsbluff 1 degree x 2 degrees quadrangle, Nebraska and Colorado, James B. Swinehart and Robert Diffendal, Jr.

1996

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Geologic History of Ash Hollow State Historical Park, Nebraska, R. F. Diffendal Jr., Roger K. Pabian, and J. R. Thomasson

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Geology Beneath the Primary Management Systems Evaluation Area (MSEA) Site Southwest of Shelton, Buffalo County, Nebraska, Robert F. Diffendal and Frank A. Smith

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Geology Beneath the Primary Management Systems Evaluation Area (MSEA) Site Southwest of Shelton, Buffalo County, Nebraska, Robert F. Diffendal Jr. and Frank A. Smith

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Estimation and Abundances in Two-Component Mineral Mixtures Using Mid-Infrared Laser Reflectance Ratios, Ram M. Narayanan, Kristin K. Warner, and Robert F. Diffendal

1995

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Geology of the Ogallala/High Plains Regional Aquifer System in Nebraska, Robert F. Diffendal

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Geology of the Ogallala/High Plains Regional Aquifer System in Nebraska: Field Trip No. 6, Robert F. Diffendal Jr.

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Geologic Map of Morrill County, Nebraska, James B. Swinehart and Robert Diffendal, Jr.

1994

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Geologic Framework of the Niobrara River Drainage Basin and Adjacent Areas in South Dakota Generally East of the 100th Meridian West Longitude and West of the Missouri River, Robert F. Diffendal and Michael R. Voorhies

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Environments of Aeolian Deposition in South-Central Nebraska During the Last Glacial Maximum, Zhao-Dong Feng; William C. Johnson; and Robert F. Diffendal, Jr.

1993

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GEOLOGICAL FIELD GUIDE TO THE CEDAR POINT BIOLOGICAL STATION, KEITH COUNTY, NEBRASKA, Robert F. Diffendal Jr. and Roger K. Pabian

1992

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SYNTHETIC-APERTURE RADAR IMAGERY AND DIGITAL SHADED-RELIEF MAP OF NORTHWEST NEBRASKA--PROBABLE STRUCTURES AND GEOMORPHIC FEATURES OF THE REGION, Robert F. Diffendal

1991

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Plate Tectonics, Space, Geologic Time, and the Great Plains: A Primer for Non-Geologists, R. F. Diffendal Jr.

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Geologic map showing configuration of the bedrock surface, North Platte, 1 degree x 2 degrees quadrangle, Nebraska, Robert F. Diffendal

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Plate Tectonics, Space, Geologic Time, and the Great Plains: A Primer for Non-Geologists, Robert F. Diffendal

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SCANNING ELECTRON MICROSCOPIC STUDY OF QUARTZ SAND SURFACE FEATURES, ASH HOLLOW FORMATION, OGALLALA GROUP, WESTERN NEBRASKA, Patricia E. Helland and Robert F. Diffendal

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Late Paleozoic Cyclic Sedimentation in Southeastern Nebraska: A Field Guide, Roger K. Pabian and Robert F. Diffendal

1990

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Review of Report of the ARL Serials Prices Project., Robert Diffendal Jr.

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The Sidney Gravel and Kimball Formation; Supposed Parts of the Ogallala Group (Neogene), Are Not Objectively Mappable Units, Robert F. Diffendal

1989

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Geology of the Pre-dune Strata, James B. Swinehart and R. F. Diffendal Jr.

1988

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Courthouse Rock Quadrangle, Morrill County, Nebraska, Robert Diffendal, Jr.

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Dalton Quadrangle, Morrill & Cheyenne Counties, Nebraska, Robert Diffendal, Jr.

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Fairchild Ranch Quadrangle, Morrill & Cheyenne Counties, Nebraska, Robert Diffendal, Jr.

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Broadwater SW Quadrangle, Morrill County, Nebraska, Robert Diffendal Jr.

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Broadwater [SE] Quadrangle, Morrill County, Nebraska, Robert F. Diffendal

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Horsehead Ranch Quadrangle, Morrill & Cheyenne Counties, Nebraska, Robert F. Diffendal Jr.

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River Potholes: Modern and Ancient, Robert F. Diffendal Jr.

1987

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Paleohydrology of Some Ogallala (Neogene) Streams in the Southern Panhandle of Nebraska, R. G. Goodwin and R. F. Diffendal Jr.

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Duer Ranch, Morrill County, Nebraska: Contrast between Cenozoic Fluvial and Eolian Deposition, James B. Swinehart and R. F. Diffendal Jr.

1985

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The Inapplicability of the Concept of the "Sidney Gravel" to the Ogallala Group (Late Tertiary) in Part of Southern Banner County, Nebraska, Robert F. Diffendal

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New Evidence Supporting the Blancan Age of the Sand and Gravel Sequence Capping the Ash Hollow Formation, Garden, Keith, and Lincoln Counties, Nebraska, Robert F. Diffendal, James W. Goeke, and Michael R. Voorhies

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Keith County, Nebraska, Map Series, Robert F. Diffendal Jr., Mark S. Kuzila, J.R. Culver, Harold M. DeGraw, R. R. Burchett, M. P. Carlson, T. Eversoll, William D. Gosnold, and Nebraska Geological Survey

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Characteristics, Age Relationships, and Regional Importance of Some Cenozoic Paleovalleys, Southern Nebraska Panhandle, Robert F. Diffendal, James B. Swinehart, and J. J. Gottula

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Cenozoic Paleogeography of Western Nebraska, James B. Swinehart, Vernon F. Souders, Harold M. DeGraw, and Robert F. Diffendal Jr.

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OLIGOCENE TO MIDDLE MIOCENE (WHITE RIVER AND ARIKAREE GROUPS) STRATIGRAPHY AND PALEOGEOGRAPHY OF WESTERN NEBRASKA, James B. Swinehart, Vernon F. Souders, H. M. DeGraw, and Robert F. Diffendal

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MIDDLE MIOCENE TO RECENT STRATIGRAPHY AND PALEOGEOGRAPHY OF WESTERN NEBRASKA, James B. Swinehart, Vernon L. Souders, H. M. DeGraw, and Robert F. Diffendal

1984

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ARMORED MUD BALLS AND FRIABLE SAND MEGACLASTS FROM A COMPLEX EARLY PLEISTOCENE ALLUVIAL FILL, SOUTHWESTERN MORRILL COUNTY, NEBRASKA, R. F. Diffendal

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COMMENTS ON THE GEOLOGIC HISTORY OF THE OGALLALA FORMATION IN THE SOUTHERN PANHANDLE OF NEBRASKA, Robert F. Diffendal

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Evidence for Quaternary Piracy of Pumpkin Creek, South-Central Morrill County, Nebraska, Robert F. Diffendal

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Evidence for Quaternary Piracy of Pumpkin Creek, South-Central Morrill County, Nebraska, Robert F. Diffendal

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FURTHER COMMENTS ON THE NATURE AND DEVELOPMENTAL HISTORY OF QUATERNARY PUMPKIN CREEK, BANNER AND MORRILL COUNTIES, NEBRASKA, Robert F. Diffendal

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Cenozoic Geology of the Southern Nebraska Panhandle: Old Valleys, Volcaniclastics, and Vertebrates: 1984 Fall Field Trip, Nebraska Geological Society, James B. Swinehart, Robert F. Diffendal Jr., Mary Rebone, and Robert Hunt

1983

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An Irvingtonian Fauna from the Oldest Quaternary Alluvium in Eastern Pumpkin Creek Valley, Morrill and Banner Counties, Nebraska, R. George Corner and Robert F. Diffendal Jr.

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Asymmetrical Distribution of Quaternary Alluvial Fills, Pumpkin Creek Drainage Basin, Western Nebraska, R. F. Diffendal Jr. and R. George Corner

1982

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Regional Implications of the Geology of the Ogallala Group (Upper Tertiary) of Southwestern Morrill County, Nebraska, and Adjacent Areas, R. F. Diffendal Jr.

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Harrisburg Quadrangle, Banner County, Nebraska, Robert Diffendal Jr.

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GEOMETRIES AND GENERAL FEATURES OF SOME CENOZOIC VALLEYS AND VALLEY FILLS, WESTERN NEBRASKA, Robert F. Diffendal

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Gully, Scour Hole, and Pothole Development at the Base of the Gering Formation (Miocene?), Southeastern Banner County, Nebraska, Robert F. Diffendal Jr.

1981

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Review of Bartlett, Great Surveys of the American West, and Schubert, Vanguard of Expansion: Army Engineers in the Trans-Mississippi West, 1819-1879, Robert F. Diffendal Jr.

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Gravity and Ground Magnetic Investigations in Eastern Nebraska, Robert F. Diffendal Jr. and R. R. Burchett

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Gravity and Ground Magnetic Investigations in Eastern Nebraska, Robert F. Diffendal Jr. and R. R. Burchett

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Geology of Lake McConaughy Area, Keith County, Nebraska, Roger K. Pabian, Robert F. Diffendal, and Frankie Gould

1980

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The Rush Creek-Lisco Structural Basin, Garden and Morrill Counties, Nebraska, R. F. Diffendal Jr.

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The Rush Creek – Lisco Structural Basin, Garden and Morrill Counties, Nebraska, Robert F. Diffendal

1979

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Broadwater NW Quadrangle, Morrill County, Nebraska, Robert Diffendal, Jr.

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Broadwater NE Quadrangle, Morrill County, Nebraska, Robert Diffendal Jr.

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A GERING FORMATION (MIOCENE) PUMICE CONGLOMERATE AND ASSOCIATED BEDS FROM BROADWATER, NEBRASKA, Robert F. Diffendal

1978

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Glinn Ranch Quadrangle, Keith County, Nebraska, Robert Diffendal Jr.

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Green Ranch Quadrangle, Lincoln County, Nebraska, Robert Diffendal Jr.

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Hershey West Quadrangle, Lincoln County, Nebraska, Robert Diffendal Jr.

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Brule SE Quadrangle, Keith & Perkins Counties, Nebraska, Robert F. Diffendal

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Brule (SW) Quadrangle, Keith & Perkins Counties, Nebraska, Robert F. Diffendal

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THE RUSH CREEK STRUCTURE, GARDEN COUNTY, NEBRASKA, Robert F. Diffendal

1977

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Barn Butte Quadrangle, Garden County, Nebraska, Robert Diffendal Jr.

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Coumbe Bluff Quadrangle, Garden County, Nebraska, Robert F. Diffendal

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PRELIMINARY REPORT ON A PLEISTOCENE POND, GARDEN COUNTY, NEBRASKA, Robert F. Diffendal

1976

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Big Springs NE Quadrangle, Garden & Deuel Counties, Nebraska, Robert Diffendal Jr.