Which of the following sets of lines is NOT a main set of base and meridian lines in California?

The correct response highlights that "Meridian Valley" is not recognized as one of the main sets of base and meridian lines in California. The primary base lines and meridians that are used for land surveying and mapping in California are well-established and include the Mt. Diablo meridian and the San Bernardino meridian, among others.

Each of these systems serves as a framework for determining land boundaries and property lines, which is crucial for real estate transactions, land development, and governmental planning. The Mt. Diablo meridian, for example, is particularly significant and covers a large portion of Northern California. The San Bernardino meridian is another key reference point for the southern regions.

In contrast, "Meridian Valley" does not correspond to any established system within California's land surveying framework. This distinction highlights the importance of knowing which meridian lines are operational and recognized for legal and survey purposes. Understanding these distinctions is vital for anyone working in real estate or land development in California, as it ensures they can reference and utilize the correct systems in their work.