148


Journal of Paleontology 90(1):147–153 Geospatial geologic data from these sources were compiled


within ArcGIS 10.1 geographic information systems software for spatial analyses and correlations. From the data compiled, the most age-equivalent units (most temporally equivalent to the fossiliferous deposit discussed herein) were identified. An estimated paleoshoreline was created by digitizing a best-fit line from the inland-most edge of the identified shallow marine deposits. For areas such as the Albemarle Embayment and the Cape Fear Arch, corrections were made for post-depositional tectonic uplift or downwarping that may have affected vertical- lateral placement. Deltas, rivers, and barrier islands are not included because more detailed stratigraphic data are needed to complete an accurate placement of these coastal features.


Systematic paleontology


Suborder Anguimorpha Fürbinger, 1900 Family Anguidae Gray, 1825


Subfamily Glyptosaurinae McDowel and Bogert, 1954 Genus and species indeterminate


Figure 1. Paleogeographic map of the eastern United States showing the reconstructed late Thanetian (late Paleocene) shoreline. White area represents exposed landmass; gray portion is ocean. Collecting site is indicated by a closed circle. The estimated shoreline is based on stratigraphic correlations of time-equivalent shallow marine deposits identified from geologic maps and subsurface data, with some structural corrections. See the Methods section of this report for references used to reconstruct this shoreline.


Optical Adhesive 61. The slide was scanned under cross- polarized light using a Zeiss Axioplan 2 petrographic micro- scope at x1250 magnification. Calcareous nannofossils were identified to the species level and assigned to the biozonation scheme of Martini (1971), as augmented by Aubry (1999), and correlated to the timescale of Vandenberghe et al. (2012). Calcareous nannofossils are common and exhibit good pre- servation throughout. To create the regional late Paleocene shoreline shown in


Figure 1, state geologic map, core, lithostratigraphic, and biostra- tigraphic data from Alabama, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, and New Jersey were compiled. Geospatial data for Alabama and Georgia are based on Lawton et al. (1976) and Szabo et al. (1988). Information for the Atlantic Coastal Plain (Georgia to NewJersey) includes data from Gildersleeve (1942), Gohn et al. (1977), Hazel et al. (1977), Scholle (1979), Van Niewenhuise (1982), Houser (1985), Ward (1986), Colquhoun and Muthig (1991), Harris and Zullo (1991), Nystrom et al. (1991), Harris et al. (1993), Miller et al. (1997), Baldwin et al. (2004), Weems and Edwards (2007), and Weems et al. (2010). Geologic map data for the Atlantic Coastal Plain states are based on Spoljaric and Jordan (1966), Cleaves et al. (1968), Lawton et al. (1976),Rhodes and Conrad (1985),Virginia Division ofMineralResources (1993),Drake et al. (1996),Horton and Dicken (2001), and Newell et al. (2007).


Material examined.—Specimens discussed in this report are housed at the South Carolina State Museum (SC) in Columbia. SC 2014.30.1, incomplete body osteoderm (Fig. 2.1); SC 2014.30.2, partial body osteoderm (Fig. 2.2); SC 2014.30.3, partial polygonal osteoderm (Fig. 2.3); SC 2014.30.4, partial body osteoderm (Fig. 2.4).


Occurrence.—Late Thanetian (late Paleocene, subzone NP9a), Chicora Member of the Williamsburg Formation. Martin Mar- ietta Aggregates quarry, approximately 4.8km southeast of Jamestown (33.279496 N; -79.64374 W), Berkeley County, South Carolina.


Description.—The most complete osteoderm in our sample is shown in Figure 2.1. It lacks the anterior edge, and some of the posterior end is missing. The osteoderm has a slightly curved rectangular outline and measures 5.2mm long (as preserved) and slightly over 3mm in width. The bone is thickest near the anterior end (0.8mm) but tapers posteriorly, resulting in a wedge shape in lateral view. The anterior-most 1.5mm of the exterior surface is smooth (gliding surface), with the remaining portion being ornamented with numerous tubercles and bearing an indistinct medial longitudinal ridge that extends to the broken posterior margin. The tubercles appear to be arranged in long- itudinal rows that are subparallel to the medial ridge. Lateral surfaces are both beveled, and the bevels are somewhat concave and weakly rugose. The interior surface is smooth and concave. Both exterior and interior surfaces are perforated by several tiny foramina. Figures 2.2, 2.4 shows two partial body osteoderms that


measure approximately 3mm in length (as preserved) and 0.7mm in maximum thickness. An anterior gliding surface is visible on the exterior surface of both specimens (Fig. 2.2a, 2.4), and the area posterior to this surface is ornamented with a random tuberculated texture and pierced by tiny foramina. The specimen seen in Figure 2.2 tapers to a sharp edge anteriorly (Fig. 2.2c), and the one preserved lateral surface is beveled like


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