Dictionary relative dating
The image is an oblique aerial photo of the Banning Fault in the northern portion of the Coachella Valley of California.An area of rock that has numerous fractures of similar trend and dip.
Once the variations in a particular object have been classified by typology, it can often be shown that they fall into a developmental series, sometimes in a single line, sometimes in branching lines more as in a family tree.
The order produced is theoretically chronological, but will need archaeological assessment.
When used in date ranges, circa is applied before each approximate date, while dates without circa immediately preceding them are generally assumed to be known with certainty.
Circa should only be used for dates that have occurred in the past.
a) The characteristics of a rock or sediment unit that reflect its environment of deposition and allow it to be distinguished from rock or sediment deposited in an adjacent environment.