Types and frequencies observed on the three sampled rocks.

<p>Types and frequencies observed on the three sampled rocks.</p

Rock #3 and the team at work.

<p>Rock #3 and the team at work.</p

Trenching marks: a) vertical b) horizontal (length of scale = 20cm).

<p>Trenching marks: a) vertical b) horizontal (length of scale = 20cm).</p

Quarrying front: note the flat top surface and the non-linear edge.

<p>Quarrying front: note the flat top surface and the non-linear edge.</p

Three views of fractured Meshash Formation flint bedded in the <i>caliche</i> crust (length of scale = 20cm).

<p>Three views of fractured Meshash Formation flint bedded in the <i>caliche</i> crust (length of scale = 20cm).</p

Size of rock surfaces and frequencies of lithic artifacts.

<p>Size of rock surfaces and frequencies of lithic artifacts.</p

Parallel strips (note the arrows) of rock damage caused by a tool with a wide working edge.

<p>Parallel strips (note the arrows) of rock damage caused by a tool with a wide working edge.</p

Flint bifaces.

<p>Flint bifaces.</p

A cluster of cupmarks (length of scale = 20cm).

<p>A cluster of cupmarks (length of scale = 20cm).</p

Aerial view of the Hilltop and the three sampled rock surfaces.

<p>Aerial view of the Hilltop and the three sampled rock surfaces.</p