Femdom chat rooms no sign ups - Relative dating of the pennsylvanian period
Coconino Sandstone in Grand Canyon looks similar to the 160 m.y Navajo Sandstone in southern Utah) [see Photos 6a&b].
Lithology is also a poor basis for correlation because different rock types can be deposited at the same time in adjacent areas because of different environments.
Grand Canyon contains many important geologic resources, including a vast fossil record ranging from Precambrian stromatolites to Ice Age mammal bones and dung found in caves; a potentially active volcanic field in the western Grand Canyon; a geologic history ranging more than 1.7 billion years; and the canyon landscape itself as the greatest example of arid land erosion.
There are two major categories of geologic dating techniques: relative dating and absolute age determinations .
Relative dating determines the order in which a sequence of past events occurred, but does not determine exactly when the geologic events happened.