Palaeoenvironmental research at Hawelti–Melazo (Tigray, northern Ethiopia) – insights from sedimentological and geomorphological analyses

Abstract. The sites of Hawelti–Melazo in the Tigray region of the northern Ethiopian Highlands is an archaeological hotspot related to the D'mt kingdom (ca. 800–400 BCE). The existence of several monumental buildings, which have been excavated since the 1950s, underline the importance of this area in the Ethio-Sabaean period. We investigated the geomorphological and geological characteristics of the site and its surroundings and carried out sedimentological analyses, as well as direct (luminescence) and indirect (radiocarbon) sediment dating, to reconstruct the palaeoenvironmental conditions, which we integrated into the wider context of Tigray. Luminescence dating of feldspar grains from the May Agazin catchment indicate enhanced fluvial activity in the late Pleistocene, likely connected to the re-occurring monsoon after the Last Glacial Maximum (LGM). The abundance of trap basalt on the Melazo plateau, which provides the basis for the development of fertile soils, and the presumably higher groundwater level during the Ethio-Sabaean Period, provided favourable settlement conditions. The peninsula-like shape of the Melazo plateau was easily accessible only from the east and northeast, while relatively steep scarps enclose the other edges of the plateau. This adds a possible natural protective function to this site.

[1]  B. Schütt,et al.  Footpaths: Pedogenic and geomorphological long-term effects of human trampling , 2022, CATENA.

[2]  J. Poesen,et al.  Sunken lanes - Development and functions in landscapes , 2021 .

[3]  Brigitta Schütt,et al.  Modeling Gully Erosion Susceptibility to Evaluate Human Impact on a Local Landscape System in Tigray, Ethiopia , 2021, Remote. Sens..

[4]  B. Schütt,et al.  Human movement and gully erosion: Investigating feedback mechanisms using Frequency Ratio and Least Cost Path analysis in Tigray, Ethiopia , 2021, PloS one.

[5]  Martha C. Anderson,et al.  Water, Geography, and Aksumite Civilization: The Southern Red Sea Archaeological Histories (SRSAH) Project Survey (2009–2016) , 2020 .

[6]  E. Bard,et al.  Timing and stepwise transitions of the African Humid Period from geochemical proxies in the Nile deep-sea fan sediments , 2020, Quaternary Science Reviews.

[7]  M. Harrower,et al.  Beta Samati: discovery and excavation of an Aksumite town , 2019, Antiquity.

[8]  P. Migoń,et al.  Escarpment retreat in sedimentary tablelands and cuesta landscapes – Landforms, mechanisms and patterns , 2019, Earth-Science Reviews.

[9]  D. Lague,et al.  Landscape dynamics revealed by luminescence signals of feldspars from fluvial terraces , 2019, Scientific Reports.

[10]  I. Finkelstein,et al.  Chronology of an ancient water reservoir and the history of human activity in the Negev Highlands, Israel , 2018, Geoarchaeology.

[11]  H. Lamb,et al.  150,000-year palaeoclimate record from northern Ethiopia supports early, multiple dispersals of modern humans from Africa , 2018, Scientific Reports.

[12]  M. Fiebig,et al.  Geochronological investigations using a combination of luminescence and cosmogenic nuclide burial dating of drill cores from the Vienna Basin , 2017 .

[13]  M. Fiebig,et al.  Luminescence dating of the Rissian type section in southern Germany as a base for correlation , 2016, Quaternary International.

[14]  J. Nyssen,et al.  The Late-Holocene geomorphic history of the Ethiopian Highlands: Supportive evidence from May Tsimble , 2015 .

[15]  E. Rhodes,et al.  Downstream MET-IRSL single-grain distributions in the Mojave River, southern California: Testing assumptions of a virtual velocity model , 2015 .

[16]  N. Drake,et al.  West African monsoon dynamics inferred from abrupt fluctuations of Lake Mega-Chad , 2015, Proceedings of the National Academy of Sciences.

[17]  J. Poesen,et al.  Environmental conditions and human drivers for changes to north Ethiopian mountain landscapes over 145 years. , 2014, The Science of the total environment.

[18]  J. Poesen,et al.  Gully head retreat rates in the semi-arid highlands of Northern Ethiopia , 2012 .

[19]  J. Rethemeyer,et al.  Climatic change recorded in the sediments of the Chew Bahir basin, southern Ethiopia, during the last 45,000 years , 2012 .

[20]  Edward J. Rhodes,et al.  Optically Stimulated Luminescence Dating of Sediments over the Past 200,000 Years , 2011 .

[21]  R. Fattovich.  The Development of Ancient States in the Northern Horn of Africa, c. 3000 BC–AD 1000: An Archaeological Outline , 2010 .

[22]  S. Zaragosi,et al.  100,000 Years of African monsoon variability recorded in sediments of the Nile margin , 2010 .

[23]  K. Thomsen,et al.  Review of optically stimulated luminescence (OSL) instrumental developments for retrospective dosimetry , 2010 .

[24]  R. Chiverrell,et al.  Luminescence dating of glaciofluvial deposits: A review , 2009 .

[25]  M. Madella,et al.  New geoarchaeological investigations of the valley systems in the Aksum area of northern Ethiopia. , 2009 .

[26]  Michael H. Marshall,et al.  Climatic change in northern Ethiopia during the past 17,000 years: a diatom and stable isotope record from Lake Ashenge , 2009 .

[27]  M. Williams,et al.  Climatic patterns in equatorial and southern Africa from 30,000 to 10,000 years ago reconstructed from terrestrial and near-shore proxy data , 2008 .

[28]  J. Poesen,et al.  Soils and land use in the Tigray highlands (Northern Ethiopia) , 2008 .

[29]  Mauro Coltorti,et al.  Planation surfaces in Northern Ethiopia , 2007 .

[30]  R. Telford,et al.  Oxygen and carbon isotope composition of authigenic carbonate from an Ethiopian lake: a climate record of the last 2000 years , 2007 .

[31]  Sarah J. Davies,et al.  Late Pleistocene desiccation of Lake Tana, source of the Blue Nile , 2007 .

[32]  J. Poesen,et al.  Processes and rates of rock fragment displacement on cliffs and scree slopes in an amba landscape, Ethiopia , 2006 .

[33]  M. Williams,et al.  Abrupt return of the summer monsoon 15,000 years ago: new supporting evidence from the lower White Nile valley and Lake Albert , 2006 .

[34]  J. Poesen,et al.  Assessment of gully erosion rates through interviews and measurements: a case study from northern Ethiopia , 2006 .

[35]  J. Poesen,et al.  Age and backfill/overfill stratigraphy of two tufa dams, Tigray Highlands, Ethiopia: Evidence for Late Pleistocene and Holocene wet conditions , 2006 .

[36]  D. Cremeens,et al.  Guidelines for analysis and description of soil and regolith thin sections , 2004 .

[37]  M. Haile,et al.  Holocene climate phases from buried soils in Tigray (northern Ethiopia): comparison with lake level fluctuations in the Main Ethiopian Rift , 2003, Quaternary Research.

[38]  H. Lamb,et al.  Forest clearance and regrowth in northern Ethiopia during the last 3000 years , 2003 .

[39]  J. Poesen,et al.  Argillipedoturbation and the development of rock fragment covers on Vertisols in the Ethiopian Highlands , 2002 .

[40]  M. Lamothe,et al.  Ubiquity of anomalous fading in K-feldspars and the measurement and correction for it in optical dating , 2001 .

[41]  G. Laslett,et al.  OPTICAL DATING OF SINGLE AND MULTIPLE GRAINS OF QUARTZ FROM JINMIUM ROCK SHELTER, NORTHERN AUSTRALIA: PART I, EXPERIMENTAL DESIGN AND STATISTICAL MODELS* , 1999 .

[42]  G. Benito,et al.  Paleoenvironmental Changes during the Last 4000 yr in the Tigray, Northern Ethiopia , 1998, Quaternary Research.

[43]  R. Pik,et al.  Timing of the Ethiopian flood basalt event and implications for plume birth and global change , 1997, Nature.

[44]  J. Prescott,et al.  Cosmic ray contributions to dose rates for luminescence and ESR dating: Large depths and long-term time variations , 1994 .

[45]  R. Green,et al.  Thermoluminescence Dating of Pacific Island Pottery: Successes and Failures , 1982 .

[46]  V. Mejdahl.  THERMOLUMINESCENCE DATING: BETA‐DOSE ATTENUATION IN QUARTZ GRAINS , 1979 .

[47]  C. Buck,et al.  IntCal13 and Marine13 Radiocarbon Age Calibration Curves 0–50,000 Years cal BP , 2013, Radiocarbon.

[48]  A. Miall.  The Geology of Fluvial Deposits , 2006 .

[49]  H. D. Contenson.  Les fouilles de Haoulti en 1959. — Rapport préliminaire , 1963 .

[50]  H. D. Contenson.  Les fouilles à Haoulti-Melazo en 1958 , 1961 .

[51]  J. Leclant.  Haoulti-Melazo (1955-1956) , 1959 .