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The two-layered turbidite “has to be two quakes recorded together”.

Then, at some later point, the northern San Andreas also shook, causing the second turbidite layer to form.

“If you shake the whole lake basin, a lot of sediment along the shoreline will fail and just run to the bottom of the basin and leave what is called a turbidite, which is just a submarine landslide deposit,” Goldfinger said in an interview at OSU’s vast geologic core repository.

Nowadays, the bigger the storm, the bigger the grain size of the resultant turbidite.

So it is curious that turbidite grains laid down during the Younger Dryas had an average diameter of 23 microns whereas those from the subsequent, warmer years averaged 19 microns.