Gourt Home::Gourt :: Chronostratigraphy
Chronostratigraphy is the branch of stratigraphy that studies the age of rock strata in relation to time.
Chronostratigraphic units, with examples:
- eonothem - Phanerozoic
- erathem - Paleozoic
- system - Ordovician
- series - Upper Ordovician
- stage - Ashgill
Chronostratigraphic units refers to the rocks in quarries, drill cores, seismographic charts etc. Rocks of the Upper Jurassic Series were formed during the Late Jurassic Epoch
You can write: Tyrannosaurus rex was found in Upper Cretaceous, but
if you write:the T-rex was living in Upper Cretaceous, you mean that the T-rex was living inside the rock !!
Chronostratigraphy is such an important branch of stratigraphy, if not the most important, because the age correlations derived are crucial to drawing accurate cross sections of the spatial organization of rocks and to prepare accurate paleogeographic reconstructions.
See also geochronology
"Chronostratigraphy"