Jaime Urrutia Fucugauchi

TL;DR: Evidence from a previously uninvestigated core, Yaxcopoil-1, drilled within the Chicxulub crater is reported, indicating that this impact predated the K-T boundary by approximately 300,000 years and thus did not cause the end-Cretaceous mass extinction as commonly believed.

TL;DR: The Chicxulub Scientific Drilling Project (CSDP), Mexico, produced a continuous core of material from depths of 404 to 1511 m in the Yaxcopoil-1 (Yax-1) borehole, revealing (top to bottom) Tertiary marine sediments, polymict breccias, an impact melt unit, and one or more blocks of Cretaceous target sediments that are crosscut with impact-generated dikes, in a region that lies between the peak ring and final crater rim as discussed by the authors.

TL;DR: The magnetic properties of the lake sediments and the associated tephra layers of the last 16500 yr have been studied in this paper, showing that the magnetic properties are very distinctive.

TL;DR: In this paper, an angular standard deviation from the field of an axial dipole of 15.3° with 95% confidence limits of 13.4° and 17.9° was determined from paleomagnetic measurements on 45 independent lava flows ranging in age (14C and K-Ar dates) from 2,500 to 580,000 years B.P.