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The Arro turbidites (Eocene San Vicente Formation) were deposited as part of the infill of the Ainsa basin during the foredeep stage of basin development. Their maximum thickness is 180 m (590 ft) with a preserved length of 16 km (10 mi) and width of 4 km (2.5 mi). Net-to-gross is approximately 40%. The Arro turbidites have been interpreted as a canyon-mouth sheet system that was deposited in a base-of-slope setting. The system is elongate with deposition occurring in the axis of the foredeep basin. Flanking the deposits was an active margin slope. The Arro turbidites have been correlated updip to a canyon fill that is incised in shelf deposits. The Los Molinos road outcrop is a partial section of the Arro turbidites. This section is 180 m (590 ft) long, transverse to the northwest-directed paleoflow. It is located approximately 4.2 km (2.6 mi) from the canyon-fill locality. Here, the Arro turbidites rest on top of a mudstone succession and reach their maximum thickness (180 m [590 ft]). Four classes of architectural elements, ranging in thickness from 1–20 m (3–66 ft), are present in the outcrop. These include 1) mudstone-rich, thin-bed elements (TM) with net-to-gross up to 30%, 2) sandstone-rich, thin-bed elements (TS), with variable net- to-gross (30–70%) and common erosive bedding, 3) thick-bed elements (C), mostly channel forms, with net-to-gross up to 90%, and 4) slump-deformed, mudstone-dominated units (SM). The lower interval of the studied succession (lower two-thirds of exposure) contains abundant slumps and thin beds. channel forms are rare, and where present,

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