This zone is established for the following purposes: 1) to protect undeveloped land located outside the present limits of urban services from indiscriminate development until urban services can be extended, enabling growth to be preplanned in a coordinated and efficient manner, 2) to extend protection from urban encroachment to active agricultural enterprises and areas particularly suitable for open space and recreational use until required for urban expansion needs or public acquisition in the case of those areas possessing distinctive geologic and/or scenic values.