After marking the first core, take a second straw and repeat steps 2 and 3 in a second location. Continue until you have drilled, located, and measured 20 cores. Based on the location of the cores and the clay layers in each one, see if you can reconstruct a three-dimensional model of the geology in the shoe box. When you think you have done it, peel away the sides of the box and see how close you came. Go to a local museum or planetarium and check out some meteorite exhibits.
Meteorite impact is only one theory used to explain the extinction of the dinosaurs.
Do a little research and see what other extinction theories are being offered. Hold a debate with your friends and discuss these theories. While the Chicxulub crater is a large one, it's not the only impact site on Earth. Research other impact sites in the United States and the world. Try making a model meteorite bombing range by using marbles of different sizes and a large baking dish filled with about an inch of flour.