What is a characteristic of the Salinian Block?

The Salinian Block is a geological formation primarily composed of granitic rocks. This characterization is significant because the granitic composition indicates a geological history involving the uplift and exposure of these rocks, which are typical of continental crust. The granites are often associated with the intrusive processes that occur in regions where tectonic plates interact.

In contrast to other options, the Salinian Block is not predominantly composed of limestone, as limestone is typically associated with marine environments and sedimentary processes rather than the granitic formations that characterize this block. Furthermore, the Salinian Block is not located within the Sierra Nevada mountain range; it is instead positioned along the California coastline, west of the Sierra Nevada. Although it does relate to tectonic features such as the San Andreas Fault, it is specifically situated west of this fault line, making 'east of the San Andreas Fault' an inaccurate description. Therefore, the correct choice highlights the distinctive granitic composition that defines the Salinian Block within the state's geology.