The minimum area of any lot or parcel of land in the R1 zone shall be as indicated by the subzone used in conjunction with the R1 zone designation. Subzones are designated by adding a suffix number to the R1 zoning symbol. Such suffix number shall be the minimum lot area for the subzone, stated in thousands of square feet. For example, a subzone of the R1 zone requiring lots or parcels to be a minimum of eight thousand (8,000) square feet would be designated on the zoning map as R1.8. The minimum area of any lot or parcel of land in the R1 zone shall be as indicated below for the subzone in which the lot or parcel is situated.