Within the depth-psychology corpus, ‘archaic’ functions as a precise technical designation rather than a mere temporal marker. Jung’s foundational formulation in Psychological Types establishes the term’s operative meaning: archaic qualities are those that exhibit the characteristics of primitive mentality — mythological imagery, participation mystique, concretism of thought and feeling, fusion of psychic functions, and ecstatic or trance states. Crucially, archaism attaches primarily to the products of unconscious fantasy, marking the layer of psyche that predates differentiated consciousness. Freud, by contrast, dismissed such images as useless ‘archaic residues,’ a position Jung systematically opposed by insisting on their vital and living function as organizing centers of psychic life — what he termed the Urbild, or archaic image. The tension between these positions structures much of the subsequent literature. Radin complicates the temporal assumption embedded in the word itself, noting that the archaic no longer stands close to its own origin but may appear closer to breakdown or transition. Kalsched extends the concept developmentally, applying ‘archaic affects’ to the unmediated somatic excitations of infancy. The Jungian post-tradition, through figures such as Plaut (as reported by Samuels), theorizes an ‘archaic ego’ present from birth that persists throughout life. Kerényi employs the term to designate a ritual and cultic residue that survives beneath later, more refined religious forms. Together these usages position ‘archaic’ as depth psychology’s primary marker for the phylogenetically and ontogenetically prior strata of psychic life.