One layer is a silicic Katla tephra layer, with the composition and location in the stratigraphy resembling that of the SILK N-1 tephra, which was deposited around 5800 cal BP.
Á meðal Kötlulaganna var eitt með dasítsamsetningu, sem líklegast er hið ̴ 5800 ára SILK N-1 gjóskulag.