Pre-impact, all quiet, (but not for long.......). Ammonites are peacefully swimming, worms dig the muddy seafloor, calcareous plankton thrives and forms the basis of the foodchain, as it has been for the preceding 3 milion years.

Impact at Chicxulub, 1200km south. Earthquakes shake the ground and cause normal faulting. Extensive soft sediment deformation and slumping occurs near the faults A few minutes later ejecta fall down on the seafloor. One hour later the first tsunamiwaves arrive.

Faulting continues during waxing and waning of tsunami waves. Movements along those faults drag layers of backwash sediments in vertical position.Ejecta are washed into opening pockets near faults

Against some faults, small wedge-shapes basins are filled with subsequent backwash sediments. Much later (>100kyr), lowstand channels are incised in slumps

Still later (>300kyr), a heavily bored transgressive surface develops on top of all preceding units, some of the impact-triggered faults continue to be active

Cartoon of the sequence of events at Moscow Landing, on the westbank of the Tombigbee River in Alabama, during the Chicxulub impactr event

Topographic map of the Moscow Landing area