Relative dating sequence pairing with people dating sites for men and women
Just as Sherlock Holmes used his power of observation to decipher the clues to a suspect's past actions, we will let the blemishes and behaviors of the rocks tell us their past story. ) Remember that relative dating involves determining "which came first" rather than "exactly when did this happen." The first step to untangling the geologic history of an area is often to figure out what happened first, second and third, etc.
without knowing the absolute ages at which the rocks themselves formed.
Cliffs, road cuts, and non-vegetated landscapes allow us glimpses into geology which is often hidden from view.
Cliffs and road cuts are "side views" or "geologic cross-sections" of the topography which show the relative positions of various rock layers and structures at a given spot.
The sequence dating method allowed the relative date, if not the absolute date, of any given Predynastic Egypt site to be ascertained by examining the handles on pottery, general form of the piece, and the stratigraphic layer it was found in. The assumption was that certain styles of pottery were popular in certain times, and during that time, the popularity would reach a peak and then fade away.
As more evidence of the predynastic period is uncovered, this dating method in relation to the pottery on site aids in determining the relative date of the site. So, if a similar style of pottery was found at a different site, they must be from around the same time period.
Sir Flinders Petrie, the younger contemporary of archaeologist Augustus Pitt-Rivers, was meticulous in his excavations and recorded every artifact and detail on site.
From his work, Petrie was able to bring chronological order to 2,200 pit graves of the Naqada cemetery in Upper Egypt. Created because of artifacts in Mayan sites had been recovered in the 1940s without stratigraphic context.
As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.
A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.
However, by itself a fossil has little meaning unless it is placed within some context.
For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.
By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.