Eritrea on three timescales: Asmara's street plan, a million-year-old cranium and stone tools in a raised reef

UNESCO places Asmara on a highland plateau at the centre of Eritrea, at over 2,000 m above sea level, and describes the protected area as the part of the city that resulted from phases of planning between 1893 and 1941, together with two unplanned neighbourhoods, Arbate Asmera and Abbashawel. The street layout is mainly an orthogonal grid that later took in elements of a radial system; UNESCO adds that the planning applied principles of functional and racial segregation. Named parts of the urban fabric include Harnet and Sematat avenues, Mai Jah Jah park, the post office on Segeneyti Street and five cinemas: Impero, Roma, Odeon, Capitol and Hamasien. The protected area covers 481 ha, with a buffer zone of 1,203 ha. For protection UNESCO cites the Regolamento Edilizio of 1938, issued at the time of what it calls Cafiero's plan, and a moratorium on new construction since 2001; it also notes that some buildings suffer from lack of maintenance and that some late-20th-century buildings are inappropriate in size, scale or character. These are UNESCO's statements, and its property record is the only source this section uses.[1]

In 1998 Abbate and colleagues reported in Nature a well-preserved Homo cranium from the northern Danakil (Afar) Depression, with a mixture of characters typical of H. erectus and H. sapiens. It lay in fluvio-deltaic and lacustrine deposits with a rich mammalian fauna of early to early-middle Pleistocene age. A magnetostratigraphic survey found two reversed and two normal magnetozones; the layer with the cranium is near the top of the lower normal magnetozone, which the authors identify as the Jaramillo subchron, so they date the remains to about 1 million years before present. Macchiarelli and colleagues (2004) place the find in the Dandiero (Buia) Basin at the Uadi Aalad site, where fieldwork between 1995 and 2003 produced the cranium UA-31, two permanent teeth and three pelvic portions; they say these represent a single adult, likely female, and that the cranium blends erectus-like features with more progressive ones that are more common in the Middle Pleistocene. A 2026 review by Beyin and Medin adds that stone tools of the Acheulean complex and fossils of land and semi-aquatic animals come from the same Buia–Dandiero area. Only the abstracts of the two older papers were read for this page.[2][3][5]

In 2000 Walter and colleagues reported in Nature early Middle Stone Age artefacts in an emerged reef terrace on the Red Sea coast of Eritrea, dated to about 125,000 years ago by uranium–thorium mass spectrometry on fossil corals; they conclude that early humans were occupying coastal areas and using near-shore marine food resources in East Africa by then. Beyin and Medin (2026) place the Abdur Reef Limestone on the eastern margins of the Gulf of Zula and describe it as made of brain and branching corals, echinoderms, molluscs and shell fragments, formed in a shallow, calm marine embayment during Marine Isotope Stage 5e (about 130–117 thousand years ago), when they say global sea level stood about 8 m above today's. Flakes are embedded in the reef, and bifaces believed to be Acheulean lie in a basal transgressive lag. A survey begun in 2005 recorded more than a dozen Stone Age sites around the southern edge of the gulf and the Buri Peninsula, most of them still undated. The Buia cranium (about 1 million years, Abbate and colleagues) is about eight times older than the Abdur tools (about 125,000 years, Walter and colleagues); that division is this page's own arithmetic. Only the abstract of the 2000 paper was read.[4][5][2]