Notable research has re-examined the transition between upper Mississippian and lower Pennsylvanian strata using integrated data sets that combine foraminiferal, ammonoid, and conodont evidence [1].

Step 1. Brush a 9x13-inch baking dish with oil. Separate the chard stems from the leaves. Dice the stems and coarsely chop the leaves, keeping them separate.

Bake the strata in the center of the oven for 30 to 35 minutes, until bubbling and browned around the edges. Remove the parchment and turn on the broiler. Broil for about 3 minutes, just until the ...