What is the limitation of relative dating in biology

10-Mar-2015 09:42

The layers of sedimentary rock, or strata, can be seen as horizontal bands of differently colored or differently structured materials exposed in this cliff.The deeper layers are older than the layers found at the top, which aids in determining the relative age of fossils found within the strata. Such index fossils must be distinctive, globally distributed, and occupy a short time range to be useful.Paleontology seeks to map out how life evolved across geologic time.

Strata are differentiated from each other by their different colors or compositions and are exposed in cliffs, quarries, and river banks.These rocks normally form relatively horizontal, parallel layers, with younger layers forming on top.