Sedimentary Petrology and Strontium Isotope Stratigraphy Within the Corozal Basin, Northern Belize

Gill, Karena K.; King, David T.

doi:10.1130/abs/2017am-295600

Cited by 1 publication

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“…Previous work on the Cretaceous part of the Yucatán’s target stratigraphy, based on outcrop studies in both México 24 and in adjacent northern Belize 36 , 37 , indicated that shallow-water carbonate facies of the target Yucatán Group show similarities with the limestone clasts in the suevite (see Ormö et al 28 , for a recent analysis). The sedimentary, (upper) target carbonates could be further subdivided into two main groups for more information of their provenance, the ‘upper target I’ and the ‘upper target II’ carbonates 28 .…”

Section: Geological Setting: Sedimentology and Paleoenvironmentmentioning

confidence: 98%

Life before impact in the Chicxulub area: unique marine ichnological signatures preserved in crater suevite

Rodrı́guez-Tovar

Kaskes

Ormö

et al. 2022

Sci Rep

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To fully assess the resilience and recovery of life in response to the Cretaceous–Paleogene (K-Pg) boundary mass extinction ~ 66 million years ago, it is paramount to understand biodiversity prior to the Chicxulub impact event. The peak ring of the Chicxulub impact structure offshore the Yucatán Peninsula (México) was recently drilled and extracted a ~ 100 m thick impact-generated, melt-bearing, polymict breccia (crater suevite), which preserved carbonate clasts with common biogenic structures. We pieced this information to reproduce for the first time the macrobenthic tracemaker community and marine paleoenvironment prior to a large impact event at the crater area by combining paleoichnology with micropaleontology. A variable macrobenthic tracemaker community was present prior to the impact (Cenomanian–Maastrichtian), which included soft bodied organisms such as annelids, crustaceans and bivalves, mainly colonizing softgrounds in marine oxygenated, nutrient rich, conditions. Trace fossil assemblage from these upper Cretaceous core lithologies, with dominant Planolites and frequent Chondrites, corresponds well with that in the overlying post-impact Paleogene sediments. This reveals that the K-Pg impact event had no significant effects (i.e., extinction) on the composition of the macroinvertebrate tracemaker community in the Chicxulub region.

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