SHRIMP U-Pb evidence for a Late Silurian age of metasedimentary rocks in the Merrimack and Putnam-Nashoba terranes, eastern New England - Wintsch, R. P.; Aleinikoff, J.; Walsh, G. J.; Bothner, Wallace; Hussey, A. M.; Fanning, C.M. (American Journal of Science, 2007)