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'''How do we know the age of the rocks?'''<br>
[[File:Africa_Hgcl_Envs.png|frameless| right|300px| ]]
'''Africa Groundwater Atlas'''<br>


[[Image:P785797.jpg|thumb|200px| ]]
This Atlas provides a summary of the hydrogeology and groundwater resources of 51 African countries, and a gateway to further information. The aim of the Atlas is to improve the availability and accessibility of high quality information on groundwater in Africa, to support the safe and sustainable development and use of groundwater resources.


Some originated as layers of sediment on the sea bed or lake floors (so they are called sedimentary rocks) and may contain the fossilised remains of animals or plants. These fossils can give a relative indication of age, with different fossil assemblages appearing in vertical succession (oldest at the bottom, youngest at the top) and each one having a lateral correlation with the same assemblage in other areas. Absolute, or numerical, age determinations are obtained by careful measurement of the proportions of minor radioactive components in igneous rocks (that were once molten), or metamorphic rocks (those much changed by great heat and high pressure). These proportions are ‘frozen-in’ when the molten or reheated rock cools and solidifies, and thereafter the radioactive elements decay steadily at a known rate. By integrating both kinds of evidence (Figure P785797) we can build up an accurate timetable of when things happened.<br>[[Bedrock Geology UK South: Introduction | '''(Read the full article...)''']]
As well as information on individual countries, Atlas provides links to further information, including through the Africa Groundwater Literature Archive, and also provides supporting information on many groundwater-related issues that affect sustainable groundwater development, management and use.
 
The Atlas provides groundwater information and maps at a national scale, not local, site-specific groundwater information. For site-specific groundwater assessments, such as siting new water boreholes, more detailed information is needed. [[Africa_Groundwater_Atlas_Home | '''(Go to Africa Groundwater Atlas ...)''']]

Latest revision as of 10:02, 21 October 2026

Africa Groundwater Atlas

This Atlas provides a summary of the hydrogeology and groundwater resources of 51 African countries, and a gateway to further information. The aim of the Atlas is to improve the availability and accessibility of high quality information on groundwater in Africa, to support the safe and sustainable development and use of groundwater resources.

As well as information on individual countries, Atlas provides links to further information, including through the Africa Groundwater Literature Archive, and also provides supporting information on many groundwater-related issues that affect sustainable groundwater development, management and use.

The Atlas provides groundwater information and maps at a national scale, not local, site-specific groundwater information. For site-specific groundwater assessments, such as siting new water boreholes, more detailed information is needed. (Go to Africa Groundwater Atlas ...)

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