The classes of districts and certain combinations thereof as designated in Article 2, and the regulations pertaining thereto are hereby applied to the land areas of the city, as delineated on the "Zoning Map of the City of Colusa," attached hereto and made a part of this ordinance and the land areas designated thereon shall be subject to the provisions and regulations of this ordinance. Said Zoning Map, together with all notations, references and other information shown thereon shall be as much a part of this ordinance as if the matters and information set forth by said map were all fully described herein.

Where uncertainty exists as to the boundaries of any of the aforesaid districts on the Zoning Map, the following rules shall apply:

(a)

Lands not included within the boundaries of any districts on the Zoning Map shall constitute R-1 Districts, and lands hereafter annexed to the city shall constitute R-1 Districts unless or until classified otherwise by interim ordinance or by amendment of the Zoning Map.

(b)

Where district boundaries are indicated as approximately following street and alley lines, such street and alley lines shall be construed to be such boundaries.

(c)

Where district boundaries are indicated as approximately following lot lines, such lot lines shall be construed to be such boundaries.

(d)

In case further uncertainly exists, the planning director, upon written application, or upon his/her initiative, shall determine the location of such boundaries.

Amendments to the City of Colusa Zoning Map referred to in this article shall be consecutively numbered subsections hereof.