Chicxulub crater stratigraphy

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The Chicxulub crater is a subsurface basin, 180 km in diameter on the northwestern Yucatan Peninsula of Mexico. It is thought to be the result of an asteroid impact approximately 66 Ma., dating at approximately the same time as the Cretaceous-Paleogene (K/T) extinction event. The impact crater formed a basin that allowed sediment deposition and digenesis to occur throughout the Cenozoic Era. Seismic images describe the crater as a circle of peak rings and annular troughs within a large depression of underlying melt and impact breccias. Tektites, shocked quartz and high traces of iridium have also been found along the K/T boundary in areas surrounding the basin.

Post-impact deposition

Horizons along the Chicxulub basin

During the Paleocene immediately following the impact, shallow-water deposition of pelagic sediment began to infill the basin. A prograding shelf sequence

See Also


  1. Barton, P.J., Christeson, G.L., Grieve, R.A.F., Gulick, S.P.S., Morgan, J.V., Urrutia-Fucugauchi, J. (2013) Geophysical characterization of the Chicxulub impact crater. Retrieved from
  2. Bell, C., Hampson, G.J., Morgan, J.V., Trudgill, B. (2004) Stratigraphic and sedimentological observations from seismic data across the Chicxulub impact basin. Retrieved from
  3. Lefticariu, L., Lefticariu, M., Perry, E.C., Ward, W.C. (2006) Post-Chicxulub depositional and diagenetic history of the northwestern Yucatan Peninsula, Mexico. Retrieved from

External links