Relati ve dating of geological strata Youtube sex cam live no card
Remember, deposition of sediments occur in areas of water.
As time passes, the organic components of bone (mostly fat) are lost primarily through bacterial action.When the bones of our early ancestors are found in the same geological strata as those of other animals that are known to have lived only during a specific time period in the past, we assume that these ancestors must also have come from that time.This is referred to as dating by association with they underwent relatively rapid evolutionary changes that are identifiable in their teeth and other skeletal parts.The geologic formation that you may see will be complicated as the illustrations below.Sometimes, geologic layers are missing in sequence. Erosion occurs when land is uplifted and deposition ceases(stop).
However, we must be careful to note whether or not the fossil comes from the mixed strata zone of the filled in hole..