Relative age dating sequence
(dark brown) Flat lying sedimentary rocks were eventually precipitated.
Time factors of millions and billions of years is difficult even for adults to comprehend.Relative age-dating methods determine when an event happened compared to another event. Geologic time scale Relative age-dating involves comparing a rock layer or rock structure with other near-by layers or structures. Roadcut in Wise County showing the principle of superposition (Photograph by Stan Johnson) Flat-lying sedimentary layers from the Appalachian Plateaus province of southwestern Virginia illustrate the principle of superposition. Absolute age-dating tells how long ago an event occurred. These rocks are tilted due to deposition on the non-horizontal surfaces of primitive rocks.This aspect of Werner's model was useful for explaining the origin of tilted sedimentary rocks.