2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36489A surface theoretic view of non-perturbative quantum gravity as "spin-foams" was proposed by Baez. A possibility of constructing such a model was studied some time ago based on (2+1) dimensional general relativity as a reformulation of the Ponzano-Regge model in Riemannian spacetime. In the present work, a model based on (3+1) dimensional general relativity in Riemannian spacetime is presented. The construction is explicit and calculable in details. For a physical application, a computation formula for spacetime volume density correlations is presented. Remarks for further investigations are made.Latex, 14 pages, No figure; Appendices added, References updatedGeneral Relativity and Quantum Cosmologytext