Lava dating com psychology tactics dating
The walls of the canyon are mostly cut into horizontal rock layers of Paleozoic age (green in Figure 1, above).
There is an angular unconformity at the bottom of the Paleozoic layers.
As discussed above, whole-rock samples of multiple flows yields the time since their common source was isotopically homogeneous.
It also be the age of the flows, but it does not have to be.
An angular unconformity is the result of tilting and eroding of the lower layers before the upper ones are deposited.