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All the specimens of Najash come from the LBPA (9), a vast area in the Río Negro province (northern Patagonia, Argentina), northwest of the town of Cerro Policía, which includes within its extension a number of paleontological localities: La Buitrera, Cerro Policía, El Loro, La Escondida, and El Pueblito. The outcrops exposed at the LBPA belong to the upper section of the Candeleros Formation, the basal unit of the Neuquén Group, which is considered to have accumulated during the Cenomanian (32). These deposits underlie the Huincul Formation, dated by fission track analysis of a volcanic tuff unit at about 88 Ma (33). The snake specimens described here have been collected in three of these localities: La Buitrera Locality, Cerro Policía Locality, and El Pueblito Locality. Within each of these localities, snake remains were recovered from a large number of different sublocalities, sites, or one-off quarries (see list in the Supplementary Materials). In general, all the remains have been recovered as single, partially articulated specimens from a sandy succession that is considered to represent the interaction between fluvial and aeolian accumulations on the fringe of a large erg, the Kokorkom Desert (10). Most of the snake specimens have been collected from thick, cross-bedded sandstone beds that are related to the migration of relatively large aeolian dunes, often found associated with paleosols as evidenced by the presence of abundant rhizoliths and burrows.

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