ABSTRACTThis paper carried out a chemical investigation of archaeological ceramic artifacts found in archaeological sites with Black Earth (ABE) in the Lower Amazon Region at Cachoeira-Porteira, State of Pará, Brazil. The ceramic artifacts, mostly of daily use, belong to Konduri culture (from 900 to 400 years BP). They are constituted of SiO 2 , Al 2 O 3 , Fe 2 O 3 , Na 2 O and P 2 O 5 ; SiO 2 and Al 2 O 3 together add up to 80 % and indicate influence of acid rocks, transformed into clay minerals basically k…
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