withdrawing from the area in 1915 after the beginning of World War I.
In 1916, Qatar became a British protectorate and Abdullah Al Thani signed a treaty stipulating that he could only cede territory to the British in return for protection from all aggression by sea and support in case of a land attack. During the 1950s and 1960s, increasing oil revenues brought prosperity, rapid immigration, substantial social progress, and the beginnings of the country's modern history.
There is abundant evidence for an Acheulean occupation from many parts of the Arabian Peninsula.
The archaeological record, however, features a significant gap in SE Arabia.
Results of our study include the documentation of the co-existence of bifacial and core technologies as well as a dominance of scrapers and bifaces in the tool assemblage.
Based on comparisons with stratified and well dated assemblages from Jebel Faya about 50 km south of Suhailah we argue that the occupation of the site likely dates to the late Middle Pleistocene.
Trends of declining groundwater levels were related to trends of increasing aridity (climate change).