Spatial distribution of the stratigraphic units and correlation between sections.

<p>(A) Map showing the limits and extension of the various stratigraphic units at Ambrona (AS3 to AS6); (B) Proposed correlation among the sections made by the H&F team and those made by the S&PG team. (*) AS6 was removed by power shovel and the 1980s fieldwork. The S&PG team did not find this unit in its own fieldwork, so it is not shown in the sections.</p

Lithostratigraphic sequence of the Ambrona site, defined by the S&PG team (after Pérez-González et al., 2005).

<p>Lithostratigraphic sequence of the Ambrona site, defined by the S&PG team (after Pérez-González et al., 2005).</p

Density maps of the faunal and lithic remains, obtained with Kernel and Jenks algorithm.

<p>The lines mark off the extension of the stratigraphic units (for more information about the limits of the units, see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0167595#pone.0167595.g004" target="_blank">Fig 4</a>). The largest accumulation of lithic items is located in the “belt” containing the AS4 unit.</p

Assessment of Accumulation Processes at the Middle Pleistocene Site of Ambrona (Soria, Spain). Density and Orientation Patterns in Spatial Datasets Derived from Excavations Conducted from the 1960s to the Present - Fig 8

<p><b>Variation of <i>p</i>-values according to the elongation index (a) and length (b) of the faunal remains.</b> The solid line delimitates the Alpha concentration, the broken line indicates the CNAmb concentration.</p

Location of the Pleistocene sites of Ambrona and Torralba in the polje of Conquezuela, in the south of the Soria province.

<p>Location of the Pleistocene sites of Ambrona and Torralba in the polje of Conquezuela, in the south of the Soria province.</p

Circular histograms produced using the D, MBR and PMA methods and showing the distribution of the various accumulations of bones (only items with elongation index > 1.6 and size > 2 cm).

<p>Circular histograms produced using the D, MBR and PMA methods and showing the distribution of the various accumulations of bones (only items with elongation index > 1.6 and size > 2 cm).</p

Density and map of faunal remains distribution.

<p>Circular histograms of the main concentrations show the trend of the assemblages according to their location.</p

Overall view of the Ambrona site faunal remains.

<p>(A) Map of the published and unpublished faunal remains after the maps obtained from the HERC were georeferenced and vectorized; (B) Areas excavated by H&F (blue) and S&PG (red). Location of the sections used to make the stratigraphic correlation.</p

Correlation between the units defined by the H&F and S&PG teams.

<p>Correlation between the units defined by the H&F and S&PG teams.</p

Aerial view of Olduvai Gorge (Tanzania) with the approximate site of SHK indicated.

<p>The inset shows the current excavations at the site.</p