Carbonate rocks of the Stuart City Formation accumulated at the Lower Cretaceous shelf margin from late Trinitian through middle Washitan. Paleobathymetry controlled facies patterns in and around reef buildups. Following uplift of the San Marcos arch during middle Washitan and consequent exposure of some reefs, fresh water diagenesis produced secondary porosity and permeability in part of the upper Stuart City.

Facies present in cores from the Speary gas field reflect deposition in backreef lagoon and open shelf-margin environments of the Comanche platform. Miliolid wackestones accumulated in protected areas behind the rudist reefs which were fringed by wave and tide-washed grainstones...

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