Fifty-four 2D seismic profiles and 13 boreholes were used to describe pre-impact and post-impact deposits in the Yucatán Shelf. Previous work has identified a pre-impact basin in the northwest portion of the Chicxulub structure. The geometry of seismic reflectors associated with the Mesozoic Era shows that this pre-impact depression, here named Yucatán Trough, extends from the southern part of the Yucatán Peninsula to the northern face of the Campeche Escarpment. Stratigraphic data from boreholes of the Yucatán Platform suggest that the main sedimentary fills of the Yucatán Trough are a thin series of Upper Jurassic-Lower Cretaceous red beds, followed by the evaporite-dominated Lower Cretaceous and the carbonate-dominated Upper Cretaceous sedimentary successions. Mapping of the Cretaceous-Paleogene (K/Pg) deposits allowed us to observe the morphology of the Yucatán Shelf by the time of the Chicxulub impact event. The two-way seismic time K/Pg deposits map in conjunction with the free-air gravity anomaly map of the northern Yucatán Block reveals that, before the impact, the carbonate platform was divided into two blocks by a ~ 95–205 km wide and ~ 470-km long trough-shaped depression, probably a rift-basin with a north-south orientation, in which the central structure of Chicxulub impact crater is contained. The seismic reflectors overlying the top of the K/Pg deposits show that, during the Cenozoic Era, both the Yucatán Trough and impact basin were filled by progradational sequences which flattened the surface completely until the current block of the Yucatán Platform was configured.

54 个二维地震剖面和 13 个钻孔被用来描述尤卡坦大陆架的冲击前和冲击后沉积物。先前的工作已经在希克苏鲁伯构造的西北部确定了一个撞击前盆地。与中生代相关的地震反射体的几何形状表明，这个撞击前的凹陷，这里称为尤卡坦海槽，从尤卡坦半岛的南部延伸到坎佩切悬崖的北面。尤卡坦平台钻孔的地层数据表明，尤卡坦海槽的主要沉积填充物是一系列上侏罗统-下白垩统的薄红层，其次是蒸发岩为主的下白垩统和碳酸盐为主的上白垩统沉积层序。白垩纪-古近纪 (K/Pg) 沉积物的测绘使我们能够在希克苏鲁伯撞击事件发生时观察尤卡坦大陆架的形态。双向地震时 K/Pg 沉积图结合尤卡坦地块北部的自由空气重力异常图显示，在撞击前，碳酸盐台地被约 95-205 km 宽和~ 470 公里长的槽状凹陷，可能是一个南北向的裂谷盆地，其中包含希克苏鲁伯撞击坑的中央结构。覆盖在 K/Pg 矿床顶部的地震反射层表明，在新生代期间，尤卡坦海槽和撞击盆地都被前积序列填充，这使得地表完全变平，直到尤卡坦平台的当前区块被构造。