The readme file was generated on 202103-16 and updated on 2021-04027 by Melissa Pardi For data relating to "Dietary plasticity of North American herbivores: A synthesis of stable isotope data over the past 7 million years" DOI 10.1098/rspb.2021.0121 GENERAL INFORMATION Title of dataset: "Raw isotope values from fossil herbivore enamel from sites located below 37° latitude within the contiguous United States" 20210316_Stable Isotope Analyses of Fossil Mammal Enamel.xlsx Author Information: Melissa I. Pardi Department of Biological Sciences, Vanderbilt University Nashville, TN, 37235, USA Department of Earth and Environmental Sciences, Vanderbilt University Nashville, TN, 37235, USA *Current affiliation Illinois State Museum 1011 E Ash St, Springfield, IL 62703 Email: melissa.pardi@illinois.gov Co-author Information: Larisa R. G. DeSantis Department of Biological Sciences, Vanderbilt University Nashville, TN, 37235, USA Department of Earth and Environmental Sciences, Vanderbilt University Nashville, TN, 37235, USA Email: larisa.desantis@vanderbilt.edu Date of data collection: Approximately 2018 through 2020 Geographic location of data: United States of America, below 37° latitude Information about funding sources that supported the collection of the data: National Science Foundation grant EAR 1725154 DATA OVERVIEW "d13C[VPDB, ‰]" Raw δ13C isotopic values from fossil herbivore (Proboscidean, Artiodactyl, Perissodactyl) enamel from sites located below 37° latitude within the contiguous United States. δ13C values are in units of per million (per mil), δ13C values are given relative to the VPDB calibration standard. Data precision is 0.1 per mil. δ13C values in dataset range from 3.2 per mil to -15.9 per mil. δ13C values from the literature span data published from 1994 through 2020. Hypsodonty index ("HI") is as described in the main text, with specific references given in Supplemental Table S1. HI is categorical: "highly" (highly hypsodont), "hypsodont", "mesodont", "brachydont". “Type” indicates whether the δ13C value presented is from a bulk sample or the mean from serial samples. “NALMA” indicates the North American Land Mammal age used in this study. NALMA is categorical: "Hemphillian", "Blancan", "Late Blancan/Rancholabrean" (omitted in NALMA-specific analyses), "Pleistocene" (omitted in NALMA-specific analyses), "Irvingtonian", "Rancholeabrean", "Latest Quaternary". “Relative Age” indicates the relative age of a site as reported in the publication the data were obtained from and, if provided, additional details on the age (Age Details) and radiocarbon dates (Age 14C). "Site" is based on "Site Detailed", the latter which may include additional descriptors in a given publication. “Museum” specifies the repository where specimens are located, if known: AZ-Arizona State Museum, AZBO-undesignated in original publication, BDM-Blackwater Draw Site Museum, CIT-undesignated in original publication, ETMNH-East Tennessee Museum of Natural History, GIL-undesignated in original publication, LACM-Los Angeles County Museum of Natural History, MCPC-Madera County Paleontology Collection, MSU-Department of Biology, Midwestern State University, NMMNH-New Mexico Museum of Natural History and Science, NSM-Nevada State Museum, SBCM-San Bernardino County Museum, SCSM-South Carolina State Museum, SMNH-Strecker Museum of Natural History, SMP-Shuler Museum of Paleontology, Southern Methodist University, TMM-Texas Memorial Museum, UA-University of Arizona, UALP-University of Arizona Laboratory of Paleontology, UCMP-University of California Museum of Paleontology, UCR-University of California, Riverside, UF-University of Florida, UF/FGS-Florida Geological Survey, UF/TRO-Timberlane Research Organization, UOK-University of Oklahoma, USNM-Smithsonian National Museum of National History, UTEP-University of Texas, El Paso. Reference details are in the Supplementary Information for DOI 10.1098/rspb.2021.0121 Details of serially sampled data are also provided in DOI 10.1098/rspb.2021.0121 18 variables 1316 records "No values" are given as blanks