- In the
scientific disciplines of
stratigraphy and geology, an
eonothem constitutes the
entirety of rock strata—distinct
layers of sediment, rock, or soil...
-
largest geochronologic time unit and is
equivalent to a
chronostratigraphic eonothem.
There are four
formally defined eons: the Hadean, Archean, Proterozoic...
- The
Phanerozoic eonothem can thus be
divided into Cenozoic, Mesozoic, and
Paleozoic erathems. Similarly, the
Proterozoic eonothem is
divided youngest...
-
usage Global (ICS)
Definition Chronological unit Eon
Stratigraphic unit
Eonothem First proposed by
Preston Cloud, 1972 Time span
formality Formal Lower...
- time, from the
shortest time span
stage to the
largest thickest strata eonothem and time
spans eon.
Concurrent work in
other natural science fields required...
- used ICS Time
Scale Definition Chronological unit Eon
Stratigraphic unit
Eonothem Time span
formality Formal Lower boundary definition Ten
oldest U-Pb zircon...
-
nearly finished with a task
begun in 1974,
subdividing the
Phanerozoic eonothem into
internationally accepted stages using two
types of benchmark. For...
- used ICS Time
Scale Definition Chronological unit Eon
Stratigraphic unit
Eonothem First proposed by
George Halcott Chadwick, 1930 Time span
formality Formal...
- used ICS Time
Scale Definition Chronological unit Eon
Stratigraphic unit
Eonothem Time span
formality Formal Lower boundary definition Defined Chronometrically...
- The
Lantian Formation is a 150-meter-thick
sequence of
rocks deposited in
Xiuning County, An****
Province in
southern China during a 90-million-year epoch...
