Lacustrine and Playa Facies in the Early Jurassic East Berlin Formation Exposed in the Dinosaur State Park Core, Hartford Basin, Connecticut
The DSP core can be correlated to an outcrop exposed in Cromwell, Connecticut, located 3.2 km further into the basin. The stratigraphic interval preserved in the DSP core thins by two meters over that distance, and contains more numerous (and thicker) cross-bedded sandstone beds. The sandstone facies is independent of other facies in the core, but only occurs within the playa and alluvial plain facies in the Cromwell outcrop. During arid climatic periods, sand is transported into the center of the basin through unconfined flows. During humid climates, sand is trapped adjacent to the basin's edge as a result of increased subaqueous accommodation associated with expanding perennial lakes. In addition, the DSP core contains perennial lake facies in four stratigraphic parasequences, while the outcrop has lake facies in only two parasequences, indicating that the core location adjacent to the Eastern Border Fault provides a more complete depositional record of the perennial lake environment.