LSED · Chapter 12 · Appendix · Section 2| Phase-Transition Dispersal and Peripheral Boundaries

This section is Section 2 of LSED Appendix I, a working hypothesis and peripheral-boundary review that produces no judgment-layer input. It examines three directional questions:(1)the Dazhushan site (OSL 65.7–52.9 ka) provides positive evidence for traces of human activity to the east within the transition window, assigned to the outward-trace category of Segment A in Section 1 (an indirect trace); the site is a secondary, water-transported deposit with no human bone or hearth found, and the attribution to modern humans is inferred from the lithic assemblage, pending confirmation in the formal report;(2)the southern corridor within the 71–57 ka window shows no continuity (graded ?), microblades postdate the window, their origin is disputed among three schools, and the recent southward pressure is a pulse rather than an expansion; (3) under the western-line filter hypothesis, westward continuity is graded ?, with the Altai as the farthest registered endpoint; the African MIS 4–2 ancient-DNA vacuum is registered as a chronological fact, not a claim of preservation bias. No conclusion here conflicts with any passage of Section 1.