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Figure 13--Outcrop photograph from the Potrero Garcia locality in northern Mexico showing the expression of the 112 Ma sequence boundary of Goldhammer et al. (1991) within the Sligo equivalent platform. View is of the east wall just north of the entrance; bedding is vertical due to structural tilting with stratigraphic up to the right. The sequence boundary is the prominent notch along the ridge line in the middle of the photograph. The left half of the photograph shows the well-bedded nature of the Cupido (Sligo) platform. The sequence boundary is marked by a prominent solution collapse breccia within peritidal cyclic facies of the uppermost Cupido (Goldhammer et al., 1991) that weathers recessively on the skyline. Transgressive deposits of the Cupidito (uppermost Sligo equivalent), which immediately overlie the sequence boundary, are overlain by recessive shale and mudstones of the La Pena (Pearsall equivalent).