Abstract:
For years, extra-terrestrial impact cratering was esoteric. However, impacts have become very important, mainly
because they have been identified as the likely immediate cause of dinosaur extinction. Impact cratering by
extra-terrestrial bodies including asteroids comets and meteorites is an important geologic process, not only for
the minerals that it forms, but also because of the knowledge that it is dangerous to mankind and life on earth.
There is also the fact that extra-terrestrial impact crater building is a continuous process that may be going on
even this very minute, somewhere in the universe. Consequently, the earth, just like other members of the solar
system is targeted by extra-terrestrial falling objects. The purpose of this study was to assess the effects of
impact cratering on Kenya’s environment, with focus on Silali basin. Silali basin is a depression that is found to
the north of Lake Baringo; around Kapedo town. It is suspected to be an Extra –Terrestrial Impact Crater
(ETIC). One objective of the study was to map out and characterize the Silali basin and provide evidence on the
nature of its formation. To attain this objective, remote sensing was utilized to map the Silali basin. Satellite
images were used to identify the nature of the crater and characterize it, since most large terrestrial impact craters
are not identifiable from the surface of the earth. The images provided critical information that was used to map
out the morphological aspects of the crater, some of which have long been buried by forces of denudation,
together with tectonic and anthropogenic forces. Analysis of satellite images and ground pictures were
supplemented by other research methods, including interviews, observation and sampling of various rocks.
Information gathered has been presented in the form of analyzed satellite images, ground pictures, tables, Digital
Elevation Models (DEMs), cross sections, aerial photographs, maps and discussions. This study has
characterized the Silali basin as a possible ETIC and explained the nature of its formation.
Key words : basin, plate, cratons, meteorite and target rocks.
