Ludman, Allan, John Aleinikoff, Henry N. Berry IV, and John T. Hopeck. “SHRIMP U–Pb Zircon Evidence for Age, Provenance, and Tectonic History of Early Paleozoic Ganderian Rocks, East-Central Maine, USA”. Atlantic Geology 540 (October 26, 2018): 335 - 387. Accessed April 1, 2020. https://journals.lib.unb.ca/index.php/ag/article/view/25868.