Simplify the following text for a Grade 12 native English-speaking person.
Original: The Franciscan Assemblage is a term in geology that describes the assemblage of rocks located near the San Franciscan Peninsula .
Simplified: The Franciscan Assemblage is a geological term for an accreted terrane of heterogeneous rocks found on and near the San Francisco Peninsula . It was named by geologist Andrew Lawson who also named the San Andreas Fault which bounds the Franciscan Assemblage .