Stratigraphy of the Lower Pierre Shale (Campanian): Implications for the Tectonic and Eustatic Controls on Facies Distributions

Figure 1

3-dimensional reconstruction of the western interior seaway during the Baculites obtusus ammonite range zone. Colors indicate approximate elevations during this time. Blue is below sea level, green is above sea level. The darkest blue indicates the areas of deepest water. Red lines are modern state boundaries for reference.