Models along where the Laurentide Ice Sheet flowed will be created to show the thickness during different stages of its retreat. This allows our team to predict when the ice sheet retreated from different elevations in the Hudson Valley. The model’s prediction of the timing of the ice sheet retreat can be tested with cosmogenic nuclide surface exposure dating boulder samples taken in the Hudson Valley area. Our models will be refined with cosmogenic beryllium-10 surface exposure dating with rock samples from the lower Hudson Valley. Cosmogenic nuclides like 10Be are isotopes which are created by the explosions of supernovas that release cosmic rays, high-energy particles that are released by supernovas. They are created in a variety of areas, including rocks and soil, when cosmic rays enter the Earth's atmosphere and emit neutrons and protons. Therefore, cosmogenic isotopes can be used to date geomorphological features as well as to comprehend various geological processes.