Objective: Provide a frame of reference for the recognition and interpretation of bezoars recovered from archeological and paleontological sites.
Materials: 49 bezoars from extant guanaco (Lama guanicoe) were analyzed and compared with five objects previously identified as bezoars, recovered from Holocene archeological sites of the Argentine Pampas.
Methods: Size, shape, weight, external and internal features, and mineralogical composition were evaluated in both modern and archeological bezoars using nondestructive and destructive methods.
Results: Modern and archeological bezoars are formed by calcium phosphate and display great morphological variability linked to ante-mortem processes, taphonomic alterations, and anthropic activity.
Conclusions: Morphometry, along with external and internal features and mineral composition, are useful tools for the identification and interpretation of bezoars in the fossil record.
Significance: This study offers new information on the etiology, mechanisms of formation, and means of interpreting the presence of bezoars, a common pathology in South American camelids, in the fossil record.
Limitations: The features of fossil bezoars do not provide accurate identification of the animal that produced them.
Suggestions for further research: Further analyses on modern bezoars belonging to other species of mammals are needed in order to enhance the interpretation of bezoars in the fossil record.
Keywords: Argentina; Artiodactyla; Holocene; Patho-gastroliths; Ruminant.
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