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David F. Ufnar
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Journal Article

Recognizing the Albian-Cenomanian (OAE1d) sequence boundary using plant carbon isotopes: Dakota Formation, Western Interior Basin, USA Available to Purchase

Darren R. Gröcke, Gregory A. Ludvigson, Brian L. Witzke, Stuart A. Robinson, R.M. Joeckel, David F. Ufnar, Robert L. Ravn
Journal: Geology
Published: 01 March 2006
Geology (2006) 34 (3): 193–196.
DOI: https://doi.org/10.1130/G21998.1
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View PDF for article title, Recognizing the Albian-Cenomanian (OAE1d) sequence boundary using plant carbon isotopes: Dakota Formation, Western Interior Basin, USA
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Journal Article

Reconstructing a Mid-Cretaceous Landscape from Paleosols in Western Canada Available to Purchase

David F. Ufnar, Luis A. González, Greg A. Ludvigson, Robert L. Brenner, Brian J. Witzke, Dale Leckie
Published: 01 November 2005
Journal of Sedimentary Research (2005) 75 (6): 984–996.
DOI: https://doi.org/10.2110/jsr.2005.074
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Journal Article

High latitude meteoric δ 18 O compositions: Paleosol siderite in the Middle Cretaceous Nanushuk Formation, North Slope, Alaska Available to Purchase

David F. Ufnar, Greg A. Ludvigson, Luis A. González, Robert L. Brenner, Brian J. Witzke
Journal: GSA Bulletin
Published: 01 March 2004
GSA Bulletin (2004) 116 (3-4): 463–473.
DOI: https://doi.org/10.1130/B25289.1
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View PDF for article title, High latitude meteoric δ 18 O compositions: Paleosol siderite in the Middle Cretaceous Nanushuk Formation, North Slope, Alaska
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Journal Article

Stratigraphic Implications of Meteoric Sphaerosiderite δ 18 O Values in Paleosols of the Cretaceous (Albian) Boulder Creek Formation, NE British Columbia Foothills, Canada Available to Purchase

David F. Ufnar, Luis A. González, Greg A. Ludvigson, Robert L. Brenner, Brian J. Witzke
Published: 01 November 2001
Journal of Sedimentary Research (2001) 71 (6): 1017–1028.
DOI: https://doi.org/10.1306/042601711017
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View PDF for article title, Stratigraphic Implications of Meteoric Sphaerosiderite δ 18 O Values in Paleosols of the Cretaceous (Albian) Boulder Creek Formation, NE British Columbia Foothills, Canada
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Journal Article

Preservation potential of ultrabasic volcanic sand in an arid intracontinental setting; will the Hopi Buttes maar-diatreme field be preserved in the rock record? Available to Purchase

David F. Ufnar, Douglas P. Smith, James D. L. White
Published: 02 January 1995
Journal of Sedimentary Research (1995) 65 (1a): 99–104.
DOI: https://doi.org/10.1306/D4268036-2B26-11D7-8648000102C1865D
View PDF for article title, Preservation potential of ultrabasic volcanic sand in an arid intracontinental setting; will the Hopi Buttes maar-diatreme field be preserved in the rock record?
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