Study of the Geologic Facies around
Majma’ah University Area
Saif Al Harbi
Saleh Al Farhood
Salman Mammdoh Al Aslab
Eng. Yahiya Al Jahmany
Civil and Environmental Engineering Department
College of Engineering, Engineering Day
23 April 2013
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Objectives
This study aims to apply a geologic evaluation of
sedimentary facies in the area around Majma’ah
University. Other objectives are:
1- Introduce a geological description the facies at the
study area;
2- Characterize the geological sub-facies in the rock
layers and beds which will reveal a lot of
geologic secrets
about the historical geology
of the study area, and will give an idea about the
ancient environment, the ancient animal and
plant life.
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Significance to KSA
Each country should seek for having its own
database about the detailed geologic studies
for each part of it. It is vital to have its
detailed geologic facies database for each
part of country. Such database would be of
great benefits to studies related to
groundwater exploration, petroleum and gas
researches, and the mining of natural
resources.
As far as the team-work concerns this is the
first study in the selected area.
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Description of the Study Area
• Al Majma’ah governorate lies nearly at longitude
line (Easting 46) and at latitude line (25 Northing)
Fig. (1). The average elevation of the area is about
(720 m) above sea level. It is a flat area penetrated
by (Al Mishqar Valley) in the northern part area.
• Hydrological study of the area indicates a drainage
pattern from (Towaiq Mountains) in the west and
from south towards the east.
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Geology of the Study Area
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Fig. (1) Geologic map of KSA
Field work
In this mini project, field measurements of some
geological features at the study area have been
carried out using simple geological devices in
order to report a geological description of the
facies at the area.
Besides, facies changes with differences in the
conditions of rock formation and compared the
facies changes to the changes that can be observed
on the present-day were detected.
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Results and Summary
The results of this study showed that the
dominant geologic facies in the study area
indicates that limestone strata are the
common geologic bed covering the earth
crust. These beds are composed of
(Khinsar) and (Hiqaqah) formations from
the (Urumah) Group which goes back to the
Upper Cretaceous age, beside the existence
of the recent deposits from the (Cenozoic
Era).
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Thanks for your attentions
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