As an alternative to the instigation of the formation of a special transit service district by resolutions, a petition may be filed with the secretary of a district signed by voters within the proposed special transit service district equal in number to at least 10 percent of the total vote cast. The boundaries of the proposed special transit service district shall be described in the petition and shall include at least two public agencies or portions thereof. A statement of the name of any public agency constitutes a sufficient and legal description of the territory if the entire area of the agency is included.