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The Leonean Orogeny 3.5 to 2.9 billion years ago and the Liberian Orogeny 2.9 to 2.5 billion years ago both influenced the Archean rocks.. Greenstone belts, sequences of metamorphic and volcanic rocks associated with cratons and used by geologists to study early tectonics are found in south-central Liberia, dating to 2.1 billion years ago.
American Association of Petroleum Geologists (AAPG) – Professional geological association American Crystallographic Association American Gem Society ( AGS ), also known as American Gemological Society – American trade association
A Liberian tropical forest. Environmental issues in Liberia include the deforestation of tropical rainforest , the hunting of endangered species for bushmeat , the pollution of rivers and coastal waters from industrial run-off and raw sewage, and the burning and dumping of household waste.
Seventeen sections, including two outside the United States, were recognized by 1973. On the occasion of the association's twenty-fifth year, twenty-two sections formed the regional units of the association. In 1964, AEG was accepted as a member society of the American Geological Institute. Membership is presently located in 15 countries.
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The Mano River Union (MRU) is an international association initially established between Liberia and Sierra Leone by the 3 October 1973 Mano River Declaration. [1] It is named for the Mano River which begins in the Guinea highlands and forms a border between Liberia and Sierra Leone. On 25 October 1980, Guinea joined the union. [2]
The purposes and goals of the association were defined as follows: Article 1: "The scope of engineering geology covers the applications of earth sciences to engineering, planning, construction, prospecting, testing and processing of related materials"; Article 2: "The aims of the IAEG are to encourage research, training and dissemination of ...
The Geological Society of America (GSA) [a] is a nonprofit organization dedicated to the advancement of the geosciences.. The Geological Society of America building in Boulder, Colorado, U.S., from above, c. 2013 Geological field excursion to Harpers Ferry, West Virginia, April 30, 1897, following the George Huntington Williams Memorial Lectures delivered by Sir Archibald Geikie at Johns ...