Fig 1.
(A) Geographic location of the AS2 site. (B) Digital Elevation Model (DEM) of the knoll and location of the excavation units (S1 Fig). (C) Photograph of central excavation units and trench.
Fig 2.
Generalized stratigraphic profile of the AS2 site.
Fig 3.
Geological context of the Arroyo Seco 2 site.
(A) Stratigraphic profile from excavation Unit 70 (south wall). (B) Calcium carbonate (CaCO3) and organic material percentages.
Fig 4.
Vertical distribution of extinct Pleistocene fauna and lithic artifacts from the AS2 site.
Calculated using the total number of tridimensional plotted remains from the excavation units 21–71.
Fig 5.
Example of the spatial association between bone, lithic artifacts, and human burials at the AS2 site.
(A) Horizontal distribution map of central excavation units 36, 37, 40 to 46 (see S1 Table for map references). (B) Lutita artifact with detail of flaked edges. (C) Oval shaped cobble (rhyolite) with detail of fracture and rounded edge. Note: All material was recovered from the lower part of stratigraphic Unit Y with the exception of Skeleton # 14 (a single individual adult primary skeleton located in the lower stratigraphic Unit Z).
Table 1.
List of extinct mammal radiocarbon dates at the AS2 site.
Fig 6.
Sample of the lithic artifacts found in the levels associated with extinct fauna.
(a) side scraper, quartzite; (b) retouched flake, quartzite; (c) retouched flake, quartzite; (d-e) scrapers made on coastal rounded cobbles; (f) bipolar cobble. All material recovered from the lower part of Unit Y, Unit S, and the upper part of Unit Z. Photograph modified from Leipus and Landini [27].
Table 2.
Quantification of anatomical units in the extinct Pleistocene mammal assemblage.
Fig 7.
Skeletal representation of the extinct horse assemblage at AS2.
Horse image modified from https://commons.wikimedia.org/wiki/File%3AHorseanatomy.png.
Fig 8.
Radius of Equus neogeus dated 12,170 ± 45 14C yrs B.P. (UCIAMS-142842).
(A) Three views with location of impact. (B) A detailed view of notches and flake-scars; dotted lines illustrate the maximum depth and breadth of notches and flake-scars.
Table 3.
Measurements on notch shapes and platform angles from the radius of Equus neogeus dated 12,170 ± 45 14C yrs B.P. (UCIAMS-142842).