Explain the geological layers in 'Рисунок 2'.

According to the legend, 'Рисунок 2' illustrates geological strata. The uppermost layer is a 'базальтовый слой' (basalt layer), represented by 'v' shapes and small triangles. Beneath that is a 'гранитный слой' (granite layer), shown with a dotted pattern. The bottommost layer is an 'осадочный слой' (sedimentary layer), depicted with horizontal dashes.