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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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), Robert 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.

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

2008

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GEOLOGIC MAP OF THE O'NEILL l O X 20 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, J. 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, J. W. Goeke, and Robert F. Diffendal

2004

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LETTER FROM THE EDITOR, Robert F. Diffendal

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Ogallala Aquifer, Robert F. Diffendal

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Topographic Maps, Robert F. Diffendal

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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

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 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

1997

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Geology, Robert F. Diffendal

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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

1996

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Geologic History of Ash Hollow State Historical Park, Nebraska, Robert 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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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

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

1993

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GEOLOGICAL FIELD GUIDE TO THE CEDAR POINT BIOLOGICAL STATION, KEITH COUNTY, NEBRASKA, Robert F. Diffendal 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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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

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, J. W. Goeke, and Michael R. Voorhies

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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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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, Robert F. Diffendal, Jr.

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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

1982

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

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 Diffendal, Jr.

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

1978

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

1977

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

1975

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MICROFOSSILS FROM THE BIG SPRINGS LIMESTONE (PENNSYLVANIAN) IN NEBRASKA, Robert F. Diffendal

1974

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MICROFOSSILS FROM THE UPPER SEVERY SHALE (PENNSYLVANIAN) NEAR DUBOIS, NEBRASKA, Robert F. Diffendal

1972

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THE DELAWARE LIMESTONE (MIDDLE DEVONIAN) OF SOUTHWESTERN ONTARIO, CANADA, Robert F. Diffendal

1971

THE BIOSTRATIGRAPHY OF THE DELAWARE LIMESTONE (MIDDLE DEVONIAN) OF SOUTHWESTERN ONTARIO, ROBERT FRANCIS DIFFENDAL