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If a geologist claims to be 45 years old, that is an absolute age.
Superposition: The most basic concept used in relative dating is the law of superposition.
Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in.
The age of formations is marked on a geologic calendar known as the geologic time scale.
Underlying assumptions are 1) that Faunal Succession is based on the observation that animals and animal communities that are preserved in sedimentary rocks change noticeably as geologic time passes (evolution).
It was first recognized by William Smith, a British Surveyor, who while working on open cuts of canals, railroads, and roads, noticed that the fossils change systematically from the older towards the younger rocks.
Scientific detective work and modern radiometric technology have only recently unlocked the clues that reveal the ancient age of our planet.What would the geologist be able to deduce about the world we live in, based on what was left in the strata?Stratigraphy started to become a formal science due to the work of a man who published under the name Nicolaus Steno in the 17th century.Ask yourself how the things that are happening in the world today might end up being recorded in the sediments that are now or soon will be deposited.How would today's sediments appear to a geologist millions of years in the future examining outcrops of sedimentary rock that originated in our time?