New Mexico Statutes Chapter 4. Counties § 4-18-1. Original county boundaries

All that portion of the territory embraced within the following boundaries, to wit: on the north and east by the limits of the territory of New Mexico; on the south by the northern limits of the county of San Miguel; and on the west by the tops of the ridge of mountains which divide the valley of Taos from Mora and Rayado, shall form and constitute a new county, to be known [as] and called the county of Mora.