Before the approval of a plat by any city, borough or township authority having the power of approval of plats, such authority shall transmit a copy of the proposed plat to the County Planning Commission and the commission shall make a report thereon to such local authority. Pending the receipt and consideration of such report, such local authority shall defer action thereon, but if such report is not received by the local authority within twenty days from the submission of the plat to the County Planning Commission, or within such further time as may be agreed upon by the local authorities, such local authority may proceed to final action thereon.
16 P.S. § 5208