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Many creeks in Summerville, SC have multiple formations present, so finding a fossil ex-situ often makes identifying the specific formation difficult, especially for those fossils that spanned multiple epochs. Since Acanthocybium solandri were present in the area beginning in the Oligocene, the following formations are possible: Oligocene: Chandler Bridge Formation and Ashley Formation Pliocene: Goose Creek Limestone (early-mid Pliocene), which contains un-reworked Miocene-Pliocene fossils Pleistocene: Ten Mile Hill Formation, which is a mid-Pleistocene lag deposit that can be found overlying older formations in the area. While many Pleistocene fossils in the area are from land mammals, Miocene-Pliocene fossils have been found in the base of the Ten Mile Hill Formation. ID references: 1. Collette, B.B., & Russo, J.L. (1984). Morphology, systematics, and biology of the Spanish mackerels (Scomberomorus, Scombridae). Fishery Bulletin, 82, 545-692. 2. Godfrey, Stephen J. (2018). The Geology and Vertebrate Paleontology of Calvert Cliffs, Maryland, USA. Smithsonian Contributions to Paleobiology. Book. https://doi.org/10.5479/si.1943-6688.100 3. Ray, Clayton E. and Bohaska, David J. 2001. Geology and Paleontology of the Lee Creek Mine, North Carolina, III. Washington, D.C.: Smithsonian Institution. https://doi.org/10.5479/si.00810266.90.1 Stratigraphy information references: 1. Boessenecker, R. (2008, May 13). The Ashley Phosphate Beds: the Reconstruction Era, Vertebrate Paleontology, Fossil Preservation, and Stratigraphic Confusion in Charleston, South Carolina. The Coastal Paleontologist. https://coastalpaleo.blogspot.com/2018/05/the-ashley-phosphate-beds.html. 2. Sanders, A. E., Weems, R. E., & Albright III, L. B. (2009). Formalization of the Middle Pleistocene ‘Ten Mile Hill Beds’ in South Carolina with evidence for placement of the Irvingtonian-Rancholabrean boundary. Papers on Geology, Vertebrate Paleontology, and Biostratigraphy in Honor of Michael O. Woodburne, 363-370.