Supplemental Materials: Early Miocene land mammals and chronology of the Belgrade Formation, eastern North Carolina

Early Miocene land mammals from eastern North America are exceedingly rare. Over the past several decades, a small but significant vertebrate fauna has been recovered by paleontologists and citizen scientists from the Belgrade Formation at the Martin Marietta Belgrade Quarry in eastern North Carolina. This assemblage has 12 land mammal taxa, including beaver (Castoridae), stem lagomorph, carnivorans (Mustelidae, Ailuridae), horses (Equidae), rhinoceros (Rhinocerotidae), tapir (Tapiridae), peccary (Tayassuidae), anthracothere (Anthracotheriidae), entelodont (Entelodontidae), and protoceratid (Protoceratidae). Taken together, the biochronology of this Maysville Local Fauna indicates a late Arikareean (Ar3/Ar4) to early Hemingfordian (He1) North American Land Mammal Age (NALMA). This interval, which includes the Runningwater Chronofauna, documents numerous important Holarctic immigrants, including Amphictis, Craterogale, and cf. Menoceras found at this locality. Strontium isotope stratigra..., This dataset contains the individual analyses for the strontium-ratio age determinations using treated sample powders taken from Oligocene oysters and Miocene shark teeth collected from the Martin Marietta Belgrade Quarry in eastern North Carolina. It also includes the statistical tests and relevant R code that were used for the statistics.
, , # Supplemental Materials: Early Miocene land mammals and chronology of the Belgrade Formation, eastern North Carolina

[https://doi.org/10.5061/dryad.7h44j103k](https://doi.org/10.5061/dryad.7h44j103k)

## Description of the data and file structure

These files contain the original data and analyses used for the interpretation of the strontium-ratio age determinations of Oligocene oysters and Miocene land mammals collected from the Martin Marietta Mine in Eastern North Carolina. These interpretations were based on previous references (cited in the main article) that developed a Neogene age curve based on unique variations in strontium ratios in the oceans at different times in the geological past.

This folder contains three files pertaining to the above-referenced paper:

1\. Belgrade_Supplementary_Materials_Updated_10.10.2025.pdf 

Statistical analyses used for the interpretation of the strontium-ratio age determinations.

2\. Belgrade_R_Script.R

R code used for the statistical analy...,