09 May 2011
The canid fauna of the Juntura Formation (Late Clarendonian), Oregon.' It's far from groundbreaking work, as most of it is a redescription of misidentified specimens, but it does have its noteworthy elements. It includes the description of a jaw of the giant dog Epicyon saevus found during our lab's field work in 2008. It provides information on the postcrania of the even more giant E. haydeni and the much smaller (but previously unknown from the Northwest) Carpocyon. Perhaps most importantly, it's the first publication to come out of the Hopkins Lab's Juntura Project. The Juntura Basin east of Burns in southeast Oregon was the research focus of the pioneering paleoecologist J. Arnold Shotwell (also of the U of O) until the 1970s, but has been largely neglected since Shotwell left the field. Our lab's field work in the area has been the first concerted research project there in nearly forty years, and if nothing else my paper stands as the first fruits of what will hopefully (and presumably) be a very fruitful paleontological endeavor.
02 May 2011
fossil beds of the John Day country are some of the best continuous exposures of Oligo-Miocene sediments in the world, and have yielded everything from tiny "worm-lizards" to gomphotheres. One of my favorite animals from the area, though, is the entelodont Archaeotherium from the Late Oligocene Turtle Cove Member of the John Day Formation (in the picture at left, Archaeotherium can be seen in the foreground, while the background is Sheep Rock, the most spectacular of the Turtle Cove outcrops). Entelodonts have been popularly termed 'terminator pigs' or 'hell pigs,' and with good reason. Opinions are split on whether or not entelodonts were particularly closely related to pigs (they may have been closer relatives of hippos), but they certainly would have been hellish things to encounter. Their large, flat teeth are similar to those of bears, pigs, and humans (though on a much larger scale than the latter two), and like all these animals they were almost certainly omnivorous, making them some of the only artiodactyls to include meat as a major part of their diet. The skulls of entelodonts, including Archaeotherium, are generally long and characterized by strange protuberances at the back of the jaw that may have served as anchors for muscles or, perhaps more likely, may have played a role in display or competition for mates. Archaeotherium was a mid-sized entelodont, but members of the family could grow to huge sizes: the giant Daeodon (once known by the fantastic name Dinohyus, or 'Terrible Pig') grew to the size of a rhinoceros.