UGA Stratigraphy Lab

The data is in the strata

Sequence Stratigraphy of the Jurassic Sundance Seaway

Although some of this work is still in review, we recognize eight unconformity-bounded depositional sequences in the marine Jurassic of Wyoming. Coupled with regional facies changes, these sequences, which locally have sandy facies in their late highstand and locally have sandy incised valley fills, have generated quite a bit of confusion in the lithostratigraphy, as previous workers sought laterally continuous horizons for correlation.

The chart below summarizes our current understanding of the sequence stratigraphic architecture in the Bighorn Basin. We are working to expand this framework across Wyoming.

sequence stratigraphic framework

Sequence stratigraphic framework in north-central Wyoming
Adapted from McMullen et al., 2014