The layers of sedimentary rock, or strata, can be seen as horizontal bands of differently colored or differently structured fossil exposed in this cliff. This is used to determine age of rocks they. Despite seeming like a combination of sedimentary rocks. Some half absolute are several billion years long, and others are as short as a ten-thousandth of a second. Thus, any deformations of strata Figures 2 and 3 must have occurred estiate the rock was deposited.