If a tract of land to be defined by a single description extends from one zone into another of the coordinate zones, the positions of all points on its boundaries may be referred to by either of the zones, the zone which is used being specifically named in the description.
Tex. Nat. Res. Code § 21.079
LAND IN MORE THAN ONE ZONE
Acts 1977, 65th Leg., p. 2360, ch. 871, art
Official source: Texas Constitution and Statutes. Reproduced from public-domain Texas statutes; confirm against the official source for the current text. Not legal advice.