Fossil record, history of life as documented by fossils, the remains or imprints of the organisms from
earlier geological periods preserved in sedimentary rock.
the analysis of the order and position of layers of archaeological remains. the structure of a particular
set of strata.
Bombardment is an event that occurred approximately 4.1 to 3.8 billion years ago, at a time
corresponding to the Neohadean and Eoarchean eras on Earth.
Layers of the Earth
Geological Time Scale
Absolute dating is the process of determining an age on a specified chronology in archaeology and
geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word
"absolute" implies an unwarranted certainty of accuracy.
Relative dating is the science of determining the relative order of past events (i.e., the age of an object
in comparison to another), without necessarily determining their absolute age, (i.e. estimated age).
geologic time scale is a system of chronological dating that relates geological to time.