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.

Follow


1988

PDF

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

PDF

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

PDF

Dalton Quadrangle, Morrill and Cheyenne Counties, Nebraska, Robert F. Diffendal Jr.

PDF

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

PDF

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

PDF

Lawrence Fork / Potter 2 NE Quadrangle, Nebraska—Banner, Morril, and Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Lisco NW Quadrangle, Nebraska—Garden, Morrill, and Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Mud Springs Quadrangle, Nebraska—Morrill and Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Redington Quadrangle, Nebraska—Banner and Morrill Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

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

PDF

Singleton Ranch Quadrangle, Nebraska—Banner, Kimball, and Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

1987

PDF

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

PDF

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

1985

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

1984

PDF

Armored Mud Balls and Friable Sand Megaclasts from a Complex Early Pleistoceme Alluvial Fill, Southwestern Morrill County, Nebraska, Robert F. Diffendal Jr.

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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.

PDF

Megaclasts in Alluvial Fills from the Ogallala Group (Miocene), Banner, Kimball, and Morrill Counties, Nebraska, Robert F. Diffendal Jr.

PDF

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

1982

PDF

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

PDF

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

PDF

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

PDF

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

1981

PDF

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.

PDF

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

PDF

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

PDF

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

1980

PDF

Ash Hollow Historical Park, R. F. Diffendal Jr.

PDF

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

PDF

Ash Hollow Historical Park, Robert F. Diffendal Jr.

PDF

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

1979

PDF

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

PDF

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

PDF

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

1978

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

Martin Quadrangle, Nebraska—Keith County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Maxwell Quadrangle, Nebraska—Lincoln County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Nevens Quadrangle, Nebraska—Keith County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Ogallala SW Quadrangle, Nebraska—Keith and Perkins Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Paxton North Quadrangle, Nebraska—Keith and Lincoln Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Sutherland Reservoir NW Quadrangle, Nebraska—Lincoln County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

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

1977

PDF

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

PDF

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

PDF

Lisco Quadrangle, Nebraska—Garden and Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Lisco SE Quadrangle, Nebraska—Garden and Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Oshkosh Quadrangle, Nebraska—Garden County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Oshkosh SW, Nebraska—Garden County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

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

PDF

Twin Buttes Quadrangle, Nebraska—Garden County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

1976

PDF

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

PDF

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

PDF

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

PDF

Lewellen Quadrangle, Nebraska--Garden County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

Ruthton Quadrangle, Nebraska—Garden and Keith Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

1975

PDF

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

PDF

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

PDF

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

PDF

Lemoyne Quadrangle, Nebraska--Keith County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

PDF

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

PDF

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

1974

PDF

Microfossils from the Upper Severy Shale (Pennsylvanian) Near Dubois, Nebraska, Robert F. Diffendal Jr.

1972

PDF

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

1971

PDF

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

PDF

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

1964

PDF

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

PDF

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