What color is the rock unit located at the USC site?

The rock unit located at the USC site is described as tan or beige, which typically signifies a sedimentary composition or a specific type of weathering process affecting the minerals present in that unit. In geological mapping, tan or beige can indicate the presence of certain types of minerals or the degree of alteration they have undergone, often linked to factors like exposure to weathering and the environment in which they were deposited.

In contrast, gray rocks often suggest a higher proportion of fine-grained materials or certain minerals like shale or basalt, while green rocks are typically indicative of specific minerals, such as olivine or chlorite, found in some igneous or metamorphic rocks. Brown rocks might suggest iron oxide content or certain sedimentary processes but do not fit the description of the USC rock unit as accurately as the tan or beige color does. Thus, the description providing tan or beige aligns well with known geological characteristics and processes associated with the rock unit at the USC site.