(a) The planning commission shall have the duty of preparing a zoning plan, including both the written provisions of the ordinance and a map or maps showing the district boundaries. The commission may hold such public hearings as it deems necessary concerning the zoning ordinance. It shall certify the zoning ordinance and map to the county commission.
On receipt of a zoning ordinance and map from the county planning commission, the county commission shall hold a public hearing thereon, after which it may adopt the zoning ordinance and map as recommended, adopt it with modifications, or reject it.
(b) The zoning ordinance, including the map or maps, may from time to time be amended, supplemented, changed, modified, or repealed. No amendment shall become effective unless it first is submitted to the county planning commission for its recommendations; failure of the county planning commission to make recommendations for a period of 30 days after the amendment has been referred to it shall constitute a favorable recommendation. No amendment may be adopted until after a public hearing thereon as prescribed above.
(c) A notice of any public hearing required by this section shall be given once a week for two consecutive weeks in a newspaper published in the county or, if there be no newspaper published in the county, by posting such notice at four public places in the county, said notice to be published the first time or posted not less than 15 days prior to the date fixed for said hearing. Said notice of public hearing shall include:
(1) Date of hearing;
(2) Location of hearing;
(3) Location where proposed amendment may be reviewed by the public; and,
(4) Time of public hearing.