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186-4 The wider influence of the scientific career of Brad Sageman with comment on research regarding the Mid-Cenomanian Event in the Cretaceous Western Interior Basin

Session: Integrated Stratigraphic, Geochemical, and Paleobiologic Perspectives on Earth System Evolution: A Session in Honor of the Contributions of Bradley B. Sageman (Part I)

Presenting Author:

Gregory Ludvigson

Authors:

Ludvigson, Gregory¹, Joeckel, Matt², Suarez, Marina³, Gonzalez, Luis⁴, Diefendorf, Aaron⁵, Andrzejewski, Kate⁶, Kalbas, Jay⁷r> (1) Kansas Geological Survey, University of Kansas, Lawrence, Kansas, USA, (2) CSD School of Natural Resources, University of Nebraska Lincon, Lincoln, Nebraska, USA, (3) Department of Geology, University of Kansas, Lawrence, Kansas, USA, (4) Department of Geology, University of Kansas, Lawrence, Kansas, USA, (5) Department of Geosciences, University of Cincinnati, Cincinnati, Ohio, USA, (6) Kansas Geological Survey, University of Kansas, Lawrence, Kansas, USA, (7) Kansas Geological Survey, University of Kansas, Lawrence, Kansas, USA; Department of Geology, University of Kansas, Lawrence, Kansas, USA,

Abstract:

As friends of Brad Sageman who are not listed as a coauthors on any publication, we wish to point out his influence in steering the research directions of other colleagues involved in Cretaceous paleoclimatic records. A specific example is the year 2000 Sageman Miniconference at Northwestern University where Brad’s feedback on group presentations catalyzed a new focus on Cretaceous stable isotopic records from the tropics (Suarez et al. 2009, doi: 10.1130/B26453.1; Suarez et al., 2010, doi: 10.2110/jsr.2010.048; and Suarez et al., 2011, https://doi.org/10.1016/j.palaeo.2011.05.027). Moreover, colleague interactions at the Sageman Miniconference with the late Mark Pagani led to investigations of integrated oxygen & hydrogen isotopic records from the Cretaceous Arctic (Ross et al, 2020, https://doi.org/10.1144/SP498-2018-134; Ludvigson et al, 2022, https://www.mdpi.com/2076-3263/12/4/143; and Andrzejewski et al., 2023, https://www.mdpi.com/2076-3263/13/9/273). Brad Sageman’s career-long leadership investigating the global-change record of the Cretaceous OAE 2 inspired an effort at the Kansas Geological Survey to carry out carbon isotope chemostratigraphic studies of Albian-Turonian strata in long-line cores in northern Kansas recently culminating in the report of Andrzejewski et al., 2025 (https://doi.org/10.5724/gcs.38.001). That work focused attention on the local expression of the Albian-Cenomanian OAE 1d and the Mid-Cenomanian Event along the cratonic margin of the Cretaceous Western Interior Basin. Continuing studies of these global-change events in newly pulled cores in Nebraska and Kansas are leading to a deeper understanding of that record. One particular outcome involves diagenetic studies of cone-in-cone calcite structures associated with the Mid-Cenomanian Event that indicate formation as offshore fresh-water seeps.

The wider influence of the scientific career of Brad Sageman with comment on research regarding the Mid-Cenomanian Event in the Cretaceous Western Interior Basin

Description

Session Format: Oral

Presentation Date: 10/13/2026

Presentation Start Time: 08:50 AM

Presentation Room: CCC, Bluebird Ballroom 3A

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