Question: Are both Arthur Isiko and Domingos Soares Ferreira Penna from the same country?
Sentence (from "Domingos Soares Ferreira Penna"): About 100 years later, Taperinha and several other fluvial shellmounds with pottery in the Lower Amazon were shown through radiocarbon dating and luminescence dating to be early Holocene in age, c. 9.000 to 7,000 BP calibrated, making them the earliest pottery sites yet known in the Americas and among the earliest in the world.
Relevant evidence: No