The Boquillas formation is the outcrop or updip equivalent to the Eagle Ford section in the subsurface. The overall succession is similar, while the facies are slightly different \. From the Buda up to the overlying Austin, the facies in outcrop near Del Rio show much more evidence of being in a proximal location.

Most notably, there is bioturbation throughout the entire section. TOC is high and there are indeed mudrock intervals that were deposited in anoxic conditions. But, conditions must have been shallow enough to support a robust epifaunal community capable of bioturbation and shallow enough for reworking of sediment. The subsurface equivalent sections are much more dominated by anoxic strata, with very little evidence of bioturbation if any at all (it may be cryptic).The outcrop also allows the viewer to examine the lateral continuity of different structures, such as the cemented/replaced beds as well as the nodular beds. In core, these intervals seem to be unusual and perhaps a solitary feature, whereas in the outcrop, they are fairly continuous, indicating they beds represent some sort of regional environmental condition.

Comparison of the outcrop and core allows a better understanding of the sequence stratigraphy during this time period