Cal Orck'o

19°00′18″S 65°14′08″W / 19.004884781743645°S 65.23566559723122°W / -19.004884781743645; -65.23566559723122

Cal Orck’o is a fossil bed in Bolivia. It is located in a quarry approximately 4.4 km northwest of Sucre (Chuquisaca Department, Bolivia) in the Altiplano/Cordillera Oriental, within the El Molino Formation (Middle Maastrichtian).

The bed is composed of oolitic fossiliferous limestone, associated with large, freshwater stromatolites. It documents an open lacustrine environment and contains nine levels of dinosaur tracks (trace fossils).

The main track-bearing level is almost vertical with a surface area of approximately 65,000 m2. High-resolution mapping of the site from 1998 to 2015 revealed a total of 12,092 individual dinosaur tracks in 465 trackways. Nine different morphotypes of dinosaur tracks have been documented, including several trackways of theropods, ornithopods, ankylosaurs, and sauropods, with the latter group accounting for 26% of the trackways.

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