The animated model on the right represents the sequence by sequence depositional history from the Leonardian 7 HFS through Guadalupian 28 HFS. Composite sequences (CS 9 through 14) are shown along the horizontal bar, with their transgressive (TST), highstand (HST), and lowstand (LST-yellow) components indicated by color.	Sequence Stratigraphic Models

The sequence stratigraphic model of the Guadalupe region is the third major component of the site. Through this stratigraphic model a record of the "time" or evolution of the stratigraphic history of the Permian region is illustrated. This model cross section has been compiled from various sources and encapsulates the main elements and scales of the classic example of mixed clastic-carbonate platform to basin profile. Stepping through the stratigraphic model one sequence at a time provides in minutes an understanding of the chronostratigraphic evolution of this system and its relation to the lithostratigraphic nomenclature that otherwise takes days to months of intensive literature review. The reciprocal nature of the clastic to carbonate alternations and the gradual evolution of the platform from ramp to rimmed shelf become readily apparent as the sequences are stacked one on the other in the html environment. The links between high-frequency sequences and composite sequences help in presenting the stratigraphy in a hierarchical context. The sequence stratigraphic model presented in the site describes the uppermost Leonardian through Guadalupian stratigraphy of the Guadalupe Mountain region in terms of 2 Leonardian (L7-L8) and 28 Guadalupian high-frequency sequences (HFS), making up six composite sequences (CS 9 through 14). The model attempts to accurately depict the main lithofacies assemblages as distributed in each sequence, but it does not differentiate systems tracts within each HFS's. Each of the HFS is thought to represent one relative sea-level cycle at approximate third-order frequency, though age dating does not adequately constrain this interpretation. Sets of lowstand, transgressive, and highstand-prone high-frequency sequences are then grouped into sets that build composite sequences. The composite sequence level is thought to be comparable to the original "depositional sequence" as described by Vail (1987). Descriptions of the individual HFS's or sets of HFS's are given in the sequence-by-sequence module, providing a short summary of key relationships. References to more detailed local studies are presented throughout both the stratigraphic model discussions and the accompanying photomosaic panels.