Regional correlation of Early Jurassic strata in eastern North America based on the geochemistry of the lava-flow units and the depth ranks of lacustrine sedimentary rocks Click on the image to see a larger version. Note in particular the close correspondence between the stratigraphy of the lower Feltville, Midland, and Shuttle Meadow formations as well as the middle and upper Towaco, East Berlin, and Turners Falls formations. Modified from Olsen et al. (1996).