General Information about Breccia Processes
Sedimentary Rocks in Devonian

When a meteor hits the seafloor, it releases energy that compresses the underlying rock and pushes it outwards. Any fragments that are thrown out of the water become ejecta material. The ejecta is pushed through the air and deposited towards the shore (stage 1).

Stage 1

Fragments that remain in the water are pushed outwards and create a large tsunami moving away from the impact, termed a surge (stage 2 and 3).

Stage 2 Stage 3

After the tsunami hits the coast and deposits the fragmented rocks, water rushes back offshore and creates a resurge of waves towards the crater (stage 4).

Stage 4

These waves pick up and re-deposit the fragmented rocks from the initial tsunami. Several surge and resurge events occur at the same time and collide into one another, reducing the wave energy (stage 5 and 6).

Stage 5 Stage 6

After the waves die out, any fragments suspended in the water settle to the bottom of the sea (stage 7).

Stage 7

All of these events occur during a marine impact, which accounts for the large variety of breccia types (A through D) deposited throughout the Alamo Impact region.

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