**Author details**

The second evolutionary stage of the foreland basin (15–10 Ma) featured a new restructur‐ ing of the broken foreland basin with the development of thick sedimentary deposits in the Calchaquí basin area that thin toward the eastern basin margin. The same pattern in sedimen‐ tation and development is observed in the Metán Subgroup basin to the east (**Figure 14c**).

The contact between the Los Colorados and Angastaco formations is a paraconformity grad‐ ing into an unconformity. Tectonics and subsidence were the fundamental controls on the evolution of the fluvial style, the deposit thickness, and the paleocurrent variability. The red sandstone clasts (Lumbrera Formation) and gray sandstone clasts (Maíz Gordo Formation) in the Tonco Valley, which are associated with easterly paleocurrents, suggest that the Sierra

The Metán Subgroup deposits are interpreted to have accumulated at ∼14.9 Ma in an arid paleoenvironment characterized by a sandy ephemeral fluvial system associated with dune fields and playa lake deposits, with sand flats, mud flats, an ephemeral saline lake, and a per‐ manent saline lake and sporadic marine incursions from the south‐east (**Figure 14c**). At ∼12 Ma, a new basin restructuring event began and the Metán Subgroup deposits began to be eroded. During the third stage of evolution in the foreland basin (∼10–5 Ma), the western part of the basin experienced at least three episodes of tectonic reactivation, which are reflected in varia‐ tions in the rate of sedimentation in the Palo Pintado Formation. Paleocurrents from the south and south‐east indicate tectonic reactivation of the depositional area from the Sierra León

The Guanaco Formation is characterized by alluvial fans deposits dominated by flowing streams and a braided fluvial system. The sedimentary paleoenvironment, provenance, and paleocurrent data suggest that the foreland basin evolved at a different time and rhythm than the Calchaquí basin, with the connection of first‐ and second‐order river systems transported material from the eastern edge of the Puna and the area of the El Toro Lineament (**Figure 14d**). The San Felipe Formation is characterized by braided fluvial fan and a shallow gravel‐braided fluvial system. The provenance and abundant clasts in different levels of the Salta Group and the association with paleocurrents from the north‐east, east, and south‐east suggest a reactivation of the Sierra León Muerto and the Sierra Los Colorados in the depositional area (**Figure 14e**). The Piquete Formation lies in marked unconformity over the deposits of the Guanaco Formation or older deposits. They accumulated as a series of alluvial fans of limited dimensions and are distributed on the flanks of structural depressions and dominated by debris flows. The compo‐ sition of the clasts of conglomerates from the Piquete Formation suggests that between ∼5 and

2 Ma, the basin was isolated from the basin of the San Felipe Formation (**Figure 14d**).

Georesources: The Andean foreland basin of Argentina (StRaTEGy).

This research was funded by the projects: AGENCIA (PICT‐2012‐1984, PICT 2014‐3654), UNJu (SECTER 08/E036 and 08/E037), UNSa (CI‐UNSa 2287), and SuRfAce processes, TEctonics and

León Muerto to the east of the Angastaco basin was uplifted (**Figure 14c**).

150 Seismic and Sequence Stratigraphy and Integrated Stratigraphy - New Insights and Contributions

Muerto‐Sierra Los Colorados (**Figure 14d**).

**Acknowledgements**

Claudia Inés Galli1,3\*, Ricardo Narciso Alonso<sup>2</sup> and Lidia Beatriz Coira3

\*Address all correspondence to: claudiagalli@fibertel.com.ar

1 INECOA‐Facultad de Ingeniería, Universidad Nacional de Jujuy, Facultad de Ciencias Naturales, Universidad Nacional de Salta, Argentina

