MagNetZ With Paula Iglesia Llanos (2023/10/11) - Refining the Jurassic-Cretaceous boundary
Channel: MagNetZ
Date: 2023-10-28

Refining the Jurassic-Cretaceous boundary: integrated bio, magneto and cyclostratigraphy of the Vaca Muerta Formation, Argentina

The video is also available for download at: https://earthref.org/ERDA/2724/
and can be referenced with the doi: 10.7288/V4/ERDA/2724

Title: Refining the Jurassic-Cretaceous boundary: integrated bio, magneto and cyclostratigraphy of the Vaca Muerta Formation, Argentina
Author: Paula Iglesia Llanos from the Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales

In contrast to most geological systems, the Jurassic-Cretaceous transition is characterized by the absence of a significant faunal turnover, or physical/chemical events within the boundary interval. The Jurassic-Cretaceous boundary working group recommended that the boundary should be determined by integrating magnetic polarities, ammonite and calpionellid zones. In Argentina, it is placed within the Vaca Muerta Formation, a carbonate-ramp system bearing ammonites. Systematic studies in this geological unit have been long carried out, including magnetostratigraphy, biostratigraphy (ammonites, calpionellids) and sedimentology. Regional magnetostratigraphic and cyclostratigraphyc scales were constructed to be correlated with the corresponding global scales. Hence on the one hand, the somewhat uncertain ammonites calibration between the Andean and Tethyan Realms was significantly refined. On the other, minimum time durations of biozones and Stages were calculated.


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00:00 - Intro
01:06 - Presentation
32:47 - Questions