🇦🇷 Argentina · Earthwork
Sierra de las Quijadas — Potrero Northern Wall Avenue and Causeway (Potrero Norte)
Contested Holocene ambiguous — historic to pre-Hispanic hypothesis · Contested Comechingón / Huarpe (?) or natural cuesta (unvalidated)
Northern rim avenue 900 m causeway 1.2 m with bastions 6 m along Potrero norte — contested Huarpe causeway vs cuesta bedding.