Geologic history- relative dating notes

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Main article: By measuring the amount of of a with a known , geologists can establish the absolute age of the parent material. Certain layers are in the form ofsand bars and gravel banks -- rock debris spread over the land by streams. Observation of modern marine and non-marine sediments in a wide variety of environments supports this generalization although is inclined, the overall orientation of cross-bedded units is horizontal.

Biostratigraphy does not directly provide an absolute age determination of a rock, but merely places it within an interval of time at which that fossil assemblage is known to have coexisted. Those atoms with a variable number of neutrons are known as isotopes.

RELATIVE TIME SCALE - Study for Quiz - Questions 2.