References

Prof :  Alzien ahmed,      Dean of Indimi Faculty of Minerals and Petroleum – International University of Africa, Mobile: +249122180073. zein67624@yahoo.com/  zein67624@hotmail.com

Dr. Noralah Mohammed Eltilib, Department of geology – International University of Africa, Mobile: +249912651631.

.Dr. Mohammed Mohammed Ahmed Amlas. Faculty of Pure and Applied Sciences .The International University of Africa. Khartoum.