River terraces around Tell Ghanem al-Ali, Raqqa, Syria

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  • シリア・ラッカ県，Tell Ghanem al-Ali 周辺に発達する河成段丘
  • シリア ラッカ ケン Tell Ghanem al Ali シュウヘン ニ ハッタツ スル カセイ ダンキュウ

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Abstract

River terraces around Tell Ghanem al-Ali, Raqqa, Syria, were studied to clarify geological and environmental settings of the tell. Five levels of terraces are recognizable on the basis of available topographic maps and field observation: terraces I (250 m a.s.l.), II (242–245 m), III (237–240 m), IV (233–234 m) and V (ca. 230 m) in descending order. Tell Ghanem al-Ali is located on the terrace V (lowermost terrace), which is 1–2 m higher than the flood plain of Euphrates. Sediments around the tell are divided into five units: channel and flood plain deposits of modern Euphrates, sediments of the lowermost terrace and Units 1–3. Stratigraphic relationship among them suggests that Unit 1, Unit 2 and sediment of the lowermost terrace were deposited in the depositional phase of this area, and that terraces I–IV were formed in the erosional phase. Stratigraphy of the Tell Ghanem al-Ali and the lowermost terrace, and available 14C dating data indicate that settlement of the tell began during the formation of the lowermost terrace at ca. 3000 cal y BC.

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