# Which of the following principles are key to relative dating blackdivine dating

*31-Mar-2020 01:49*

The contact between the granite and the conglomerate is irregular, similar to how the present-day surface of the land is irregular.

The diagram below is a simplified representation of the stratigraphy of the Grand Canyon.

You can use principles of relative geologic age to determine sequences of geologic events, including rock formations, intervals of erosion, tilting, folding, and faulting like those represented in the block diagrams and cross-sections below.

Be sure to review the principles of relative geologic age on the Geologic Time Basics page .

By the definition of a half-life, the amount of parent isotope at each half-life is half of what it was before the half-life elapsed.

As the amount of parent isotope decreases by radioactive decay, the amount of the daughter isotope increases commensurately.

The mathematical formula can be used to determine exactly how much time has elapsed, for any fraction of parent/daughter isotope, without having to make a visual estimate from a graph.

The mathematical formula is expressed as follows: where age is the absolute age (typically using years as the time unit), ln is the natural logarithm, D is the amount of daughter isotope, and P is the amount of parent isotope.

Consistent with the principle of superposition, the deeper in the Canyon you go, the older the rocks are.

Note that unconformities, which on the diagram above are symbolized by the irregular lines, are indicated by dashed lines in the column below.

Also, the formations that appear on the simplified stratrigraphy diagram above are marked in the table with the number that corresponds to the diagram.

There is a definite mathematical relationship between the ratio of the amount of daughter product isotope to the amount of radioactive parent isotope, and the number of half-lives that have elapsed.

The relationship is non-linear, involving a logarithmic function.

The Paleozoic strata do not include the Temple Butte Limestone and Surprise Canyon Formation, which are not widespread in the Grand Canyon.