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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1985

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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

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Megaclasts in alluvial fills from the Ogallala Group (Miocene), Banner, Kimball, and Morrill counties, Nebraska, Robert Diffendal Jr.

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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Ash Hollow Historical Park, Robert 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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Martin Quadrangle, Nebraska—Keith Co., Robert Diffendal

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Maxwell Quadrangle, Nebraska—Lincoln Co., Robert Diffendal

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Nevens Quadrangle, Nebraska—Keith Co., Robert Diffendal

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Ogallala SW Quadrangle, Nebraska—Keith Co.--Perkins Co., Robert Diffendal

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Paxton North Quadrangle, Nebraska—Keith & Lincoln Co. 7.5 minute series (topographic), Robert Diffendal

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Sutherland Reservoir NW Quadrangle, Nebraska— Lincoln Co. 7.5 minute series (topographic), Robert Diffendal

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

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

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Oshkosh Quadrangle, Nebraska—Garden Co. 7.5 minute series (topographic), Robert Diffendal

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Oshkosh SW, Nebraska—Garden Co. 7.5 minute series (topographic), Robert Diffendal

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Twin Buttes Quadrangle, Nebraska— Garden Co. 7.5 minute series (topographic), Robert Diffendal

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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.

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

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Lewellen Quadrangle, Nebraska--Garden Co., Robert Diffendal

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Ruthton Quadrangle, Nebraska— Garden & Keith Co. 7.5 minute series (topographic), Robert Diffendal

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Keystone Quadrangle, Keith County, Nebraska, Robert F. Diffendal

1975

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Belmar Quadrangle, Keith County, Nebraska, Robert Diffendal Jr.

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Lemoyne Quadrangle, Nebraska--Keith Co., Robert Diffendal

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Brule NE Quadrangle, Keith County, Nebraska, Robert F. Diffendal

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Brule NW Quadrangle, Keith County, Nebraska, Robert F. Diffendal

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Microfossils from the Big Springs Limestone (Pennsylvanian) in Nebraska, Robert F. Diffendal

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Ogallala Quadrangle, Nebraska-Keith Co. 7.5 Minute Series (Topographic) [Annotated], Robert F. Diffendal Jr.

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

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The Biostratigraphy of the Delaware Limestone (Middle Devonian) of Southwestern Ontario, Robert F. Diffendal

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

1964

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Paleoecology of Pseudozaphentoides verticillatus (Barbour) in the Plattsmouth Limestone (Pennsylvanian), Robert Francis Diffendal Jr.