The Grey Skorba phase (4500-4100 BCE) follows the Early Neolithic Għar Dalam phase (5200-4500 BCE) in Malta's prehistory. It is marked by a distinctive grey pottery, without decoration. Other remains from the period include seashells, bone ornaments and implements, stone tools and number of sling stones possibly used for hunting. Flakes of obsidian and flint were found, probably imported from Sicily. The Grey Skorba phase evolved into the Red Skorba phase (4400-4100 BCE).
The prehistoric site at Skorba was first noted during the early years of the twentieth century. At the time, a conspicuous megalith was recorded as a menhir; however in 1937 Captain Charles Zammit, curator of archaeology, established the presence of other megaliths in the immediate vicinity and the site was fully excavated by David Trump between 1961-1963.