Table Mesa and Rattlesnake Fields are located on the Four Corners Platform, New Mexico, between the Paradox Basin to the north and San Juan Basin to the south. Diagenesis is extensive and includes partial dissolution and replacement of ooids, partial silicification of allochems and matrix, and filling of pore space with large, blocky calcite. Pore types include interparticle, intraparticle, and vuggy, with much porosity lost to late cementation. Porosity is greatest in cycles interpreted as regressive deposits with meteoric and burial diagenesis being most significant to porosity enhancement. Sea level and depositional history are shown to be significantly useful in predicting patterns of porosity development and destruction. These results are directly applicable to other economically important carbonate platforms.