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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2022

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Fossils on the Floor Mosaics in the Rotunda of the Nebraska State Capitol Second Edition, Robert F. Diffendal

2021

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

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Rock Glen Wildlife Area: A Landscape History, Gerry Steinauer and Robert Diffendal Jr.

2020

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Tributes to Rick Edwards upon His Retirement, Robert Diffendal, Michael Farrell, Michael David Forsberg, Maurice Godfrey, John A. Janovy Jr., Katie Nieland, Linda Pratt, Rebecca S Wingo, David J. Wishart, George E. Wolf, Peter Longo, and John R. Wunder

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Hydrogeology and Geology of the Lower North and South Platte Rivers of Nebraska: Nebraska Geological Society Field Trip 2020, Douglas R. Hallum, Paul R. Hanson, Shane Tucker, and Robert Diffendal

2019

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Fun in a Kansas salt mine, Robert F. Diffendal Jr

2018

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Review of The Ends of the World: Volcanic Apocalypses, Lethal Oceans, and Our Quest to Understand Earth's Past Mass Extinctions by Peter Brannen, Robert F. Diffendal, Jr.

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Fossils on the Floor in the Nebraska State Capitol: A Coloring and Activities Book, Robert F. Diffendal Jr.

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Geologic Mapping of Nebraska: Old Rocks, New Maps, Fresh Insights, R. M. Joeckel, Robert F. Diffendal, P. R. Hanson, and Jesse T. Korus

2017

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Geological Principles Illustrated in the Art along the Antelope Valley Hiker/Biker Trail – The BIG X (Salt Creek Roadway/Antelope Valley Parkway) South to Q Street, Robert Diffendal, Jr.

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Great Plains Geology: My Personal Journey, Robert Diffendal, Jr.

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Great Plains geology -- A personal journey, Robert F. Diffendal Jr.

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Nebraska, USA: Wonderful fossils, natural history museums and public art depicting fossils, Robert F. Diffendal Jr

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Review of Great Plains Geology by Robert F. Diffendal, Jon Trevelyan

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, R. F. Diffendal Jr.

2014

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The University of Nebraska State Museum, Robert Diffendal Jr.

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

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Ashfall Tephra in the Ogallala Group of the Great Plains: Characteristics and Significance, Michael E. Perkins, Robert F. Diffendal Jr, Michael R. Voorhies, Barbara P. Nash, and Bruce E. Bailey

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

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Pamphlet to Accompany Geologic Map GMC-34: Geologic Map of the O’Neill 1º x 2º Quadrangle, Nebraska, with Configuration Maps of Surfaces of Formations, R. F. 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

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Geologic Framework and Groundwater Occurrence (Kimball County, Nebraska), Robert Diffendal Jr.

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

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Geomorphic and Environmental Change Around a Large, Aging Reservoir: Lake C. W. McConaughy, Western Nebraska, USA, R. Matthew Joeckel and Robert Diffendal Jr.

2003

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Ash Fall Historic Park: Field Trip 5, Robert Diffendal, Jr. [compiler]

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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

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Southeast Nebraska Geology: Field Trip 3, Roger K. Pabian; Robert Diffendal, Jr.; and Darwin R. Boardman II

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

2001

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Ecoregions of Nebraska and Kansas, Robert F. Diffendal

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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Earth in Four Dimensions: Development of the Ideas of Geologic Time and History, Robert F. Diffendal Jr.

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Earth in Four Dimensions: Development of the Ideas of Geologic Time and History, Robert F. Diffendal Jr.

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Geology and Ground Water: Garden County, Nebraska, 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 & Ground Water, Cheyenne County, Nebraska, Robert F. Diffendal Jr.

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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 Jr. 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 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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Geomorphic and structural features of the Alliance 1º × 2º Quadrangle, western Nebraska, discernible from synthetic-aperture radar imagery and digital shaded-relief maps, Robert Diffendal

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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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Profiles: Nelson Horatio Darton: His Surveys Laid the Foundation, Robert Diffendal Jr.

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Understanding Groundwater Starts with the Rocks: Geologic Fralnework, Groundwater Occurrence and Irrigation Development in Nebraska, Robert Diffendal Jr.

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

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APPLICATION OF SEALEVEL STRATIGRAPHY TO NEOGENE GREAT PLAINS STRATIGRAPHY, Robert Diffendal Jr. and A. Lowrie

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

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Stable isotope composition of calcareous paleosols and ground-water cements from the Ogallala Group (Neogene), western Nebraska, Leonard Robert Gardner, Robert Diffendal Jr., and Douglas F. Williams

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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Lake Maloney Quadrangle, Nebraska-Lincoln County, Robert Diffendal

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Late Pennsylvanian and Early Permian Cyclic Sedimentation, Paleogeography, Paleoecology, and Biostratigraphy in Kansas and Nebraska, Roger K. Pabian and Robert Diffendal, Jr.

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

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

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Lawrence Fork / Potter 2 NE Quadrangle, Nebraska—Banner, Morril, & Cheyenne Co. 7.5 minute series (topographic), Robert Diffendal

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Lisco NW Quadrangle, Nebraska—Garden-Morrill-Cheyenne Co., Robert Diffendal

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Mud Springs Quadrangle, Nebraska—Morrill Co.—Cheyenne Co., Robert Diffendal

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Redington Quadrangle, Nebraska—Banner & Morrill Co. 7.5 minute series (topographic), Robert Diffendal

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Singleton Ranch Quadrangle, Nebraska— Banner, Kimball, & Cheyenne Co. 7.5 minute series (topographic), Robert Diffendal

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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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Overview of Nebraska and the Regional Aquifer from Proceedings of the 1985 Water Resources Seminar Series, Robert F. Diffendal