The document discusses the geological research history of Yemen. It presents a new classification that divides the history into four stages. It suggests that documenting the first geologists to work in Yemen and their contributions could be the basis for an informative book. The classification system and a table of lithostratigraphic units are presented as providing a framework for understanding Yemen's geological evolution and addressing inconsistencies in past studies. Mapping of eastern Yemen revealed structures with oil and gas potential. New modeling methods are proposed to aid geological studies. Recommendations include further documentation and research on key periods and locations to advance knowledge of Yemen's geology.