Atlit-Yam is a submerged, single stratum, Pre-Pottery Neolithic C (PPNC) site radiometrically dated to the first half of the 9th millennium cal. BP. The flint assemblages provide a lithic definition for the PPNC and are attributed to a specific, coastal sub-culture of the Ghazalian. Technologically, bidirectional blade production continues, but it is on the decline. Unidirectional blade production is common while bladelets at Atlit-Yam are by-products of blade production although they may be a systematic, and independent PPNC trajectory (e.g., at Beisamoun). Typologically, there are subtypes of Byblos and Amuq points that differ in form and shaping from the former Pre-Pottery Neolithic B (PPNB) types while small Pottery Neolithic (PN) arrowheads make an early appearance. Dominating the assemblage is a typical PPNC type of sickle blade, that differs from both the PPNB and the Pottery Neolithic (PN) Yarmukian sickle blade forms, and shows characteristic shaping of the working edge and denticulation. Type A sickle blades typical of the early PN Yarmukian appear in low, but increasing, frequencies. Bifacials are dominated by axes and show unique subtypes (e.g., flat trapezoidal). An impressive and innovative aspect of Atlit-Yam (and the PPNC) are bifacial knives of elaborate types (daggers) fully shaped by pressure-retouch. The lithic assemblages alone are sufficient for defining the PPNC and negating a PPNB or a PN Yarmukian assignment of the site.