SGI : Standardized Growth Index calculated using (Schöne, 2013 http://dx.doi.org/10.1016/j.gloplacha.2013.09.013) formula Anatomical parts codes: ce (external layer), ch (chondrophore) and re (resilium) These data are discussed in Poitevin et al. 2018 submitted to Plos One SGI values are valid to 2 decimal places Shells collected in Saint-Pierre and Miquelon : by scuba diving along the southeastern shore of Miquelon-Langlade sandy isthmus (46°54'20"N; 56°18'58"W) in November 2015 This work was supported by the EC2CO program MATISSE of the CNRS INSU, the Cluster of Excellence LabexMER, and the LIA BeBEST CNRS INEE. This research was carried out as part of the Ph.D. thesis of Pierre Poitevin for the University of Western Brittany with a French Ministry of Higher Education and Research grant.

Datatset associated to PlosOne submission : PONE-D-18-04457R1 Title : Ligament, hinge, and shell cross-sections of the Atlantic surfclam (Spisula solidissima): Promising marine environmental archives in NE North America Authors : Pierre Poitevin, Julien Thébault, Bernd Reinhard Schöne, Aurélie Jolivet, Pascal Lazure, Laurent Chauvaud