Overview

dating methods

Return to overview »

You are looking at 1-13 of 13 entries

View:

absolute age

absolute age  

The age of a geologic phenomenon measured in present Earth years, rather than its age relative to other geologic phenomena (compare relative age). The term ‘absolute age’ has been considered rather ...
climate change

climate change  

Reference type:
Overview Page
Subject:
History
The change in world climate patterns over time. Such change has always occurred, both on a large scale since the formation of the earth and on a smaller scale within the span of human history. For ...
Climate Reconstruction

Climate Reconstruction  

Our knowledge of climate history prior to the availability of instrumental records comes from two main sources: (1) historical observations, where information on past climatic conditions is contained ...
Dating Methods

Dating Methods   Reference library

Encyclopedia of Global Change

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Environmental Science, Social sciences, Environment
Length:
4,077 words
Illustration(s):
4

The reconstruction of past climates depends heavily on highly refined stratigraphy and dating methods. Paleoclimatology, the study of ancient climates,

Dating Methods

Dating Methods   Reference library

The Oxford Companion to Global Change

Reference type:
Subject Reference
Current Version:
2009
Subject:
Science and technology, Environmental Science, Social sciences, Environment
Length:
3,524 words
Illustration(s):
1

The reconstruction of past climates (paleoclimatology) depends on highly refined stratigraphy and dating methods. [See Paleoclimate.] Stratigraphy includes

Desert Dunes in a Warmer World

Desert Dunes in a Warmer World  

Desert sand dunes, because of the crucial relationships between vegetation cover and sand movement, are highly susceptible to the effects of changes of climate. Some areas, such as the southwestern ...
geochronology

geochronology  

The chronology of the Earth generated from geological information; the science of the absolute and relative dating of geological formations and events.
geochronometry

geochronometry  

The determination of the length of time intervals. Geochronometric resolutions for zonations based on different organisms may be calculated by dividing the time-span of a series by the number of ...
geologic time-scale

geologic time-scale  

A twofold scale that subdivides all the time since the Earth first came into being into named units of abstract time, and subdivides all the rocks formed since the Earth came into being into the ...
isotopic dating

isotopic dating  

Means of determining the age of certain materials by reference to the relative abundances of the parent isotope (which is radioactive) and the daughter isotope (which may or may not be radioactive). ...
paleoclimate

paleoclimate  

The climate of a particular period in the geological past, before historical records or instrumental observations. Palaeoclimatology uses evidence from glaciers and ice sheets, geology, sediments, ...
Proxy Data for Environmental Change

Proxy Data for Environmental Change  

Land-based proxy data for past environmental changes include records from peat bogs, growth patterns of trees with seasonal rings (dendroclimatological data), the orientation of desert dunes, the ...
relative age

relative age  

The position within a time sequence (in the Earth sciences usually the stratigraphic time-scale) held by an event, fossil, mineral, or rock, compared with others of its kind, e.g. ‘an early Cambrian ...

View: