Tag: bone modification

Paleontology Headline: Caiman Bites Sloth

Predation of the giant Miocene caiman Purussaurus on a mylodontid ground sloth 2020. Figure 2:Life reconstruction of the putative attack of a young to sub-adult Purussaurus on the ground sloth Pseudoprepotherium in a swamp of proto-Amazonia. Art: Jorge A. González.

It only took one 13-million-year-old bone for two paleontologists to reconstruct the dramatic encounter pictured above. That bone is a tibia, or lower leg bone, from an extinct ground sloth (not a giant ground sloth, just a 170 pound medium-sized one). The tibia has 46 tooth marks on it, made by the extinct caiman (a close relative of alligators) Purussaurus.

Read the paper by Pujos and Salas-Gismondi to see how, through a detailed taphonomic analysis of a single bone, they were able to infer not only what animal did the biting, but also how old it was. Unresolved: whether the caiman got the whole sloth or just the leg.

Detail of Figure 1: Left tibia of Pseudoprepotherium sp. (MUSM 1587) and mapping of the bite marks, from Pujos and Salas-Gismondi 2020.

Reference:

Predation of the giant Miocene caiman Purussaurus on a mylodontid ground sloth in the wetlands of proto-Amazonia

Pujos F, Salas-Gismondi R. 2020 Predation of the giant Miocene caiman Purussaurus on a mylodontid ground sloth in the wetlands of proto-Amazonia. Biology Letters 16: 20200239. http://dx.doi.org/10.1098/rsbl.2020.0239

Featured image: Detail of Figure 2 from Pujos and Salas-Gismondi. Artwork by Jorge A. González.

Zooarchaeology in Pennsylvania

This 2015 post on This Week in Pennsylvania Archaeology is about zooarchaeology and includes new photos of animal bones and cut marks from the famous Eschelman Site in Lancaster County, which was the subject of one of the earliest systematic analyses of bone modification marks on an American faunal assemblage.

Reference:

Guilday, John E., Paul W. Parmalee and Donald P. Tanner

1962       Aboriginal Butchering Techniques at the Eschelman Site (36LA12), Lancaster County, Pennsylvania. Pennsylvania Archaeologist 32(2):59-83.