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Fourth sloth discovered

Greg McDonald is here  cataloging Megalonyx bones from the site.  He found  a right fifth metacarpal of a Paramylodon harlani that we had misidentified as a Megalonyx metatarsal.  This is the first confirmed record of a Paramylodon in Iowa.  

The bone was found by the landowner, Bob Athen, in 2006 on a gravel bar about 200 feet downstream from where we are currently digging. We assumed it had been transported there by the 1993 flood that exposed the original deposit.  That may still be true.  The bone is in excellent condition and retains all of its muscle scars, etc.  It did not roll far.  An analysis of the rare earth elements in the bone may tell us if the animal died about the same time as our sloth family.

Harlan’s ground sloth was the second largest of North America’s four Ice Age ground sloth species, weighing in at approximately 3,070 lbs.–about  20% more than Jefferson’s sloth (McDonald, 2005).  P. harlani was a grazer, or perhaps more properly a browser-grazer (Naples, 1989) and widespread on North America’s grasslands.  M. jeffersonii is believed to have been a browser. . . . Dave

References

McDonald, H.G. 2005.  Paleoecology of extinct Xenarthrans and the Great American Biotic Interchange.  Bulletin of the Florida Museum of Natural History 45: 313-333.

Naples, V.L. 1989.  The feeding mechanism in the Pleistocene ground sloth, Glossotherium.  Contributions in Science, Natural History Museum of Los Angeles County 415: 1-23.

  1. Pete Eyheralde’s avatar

    Hmmm… Valley of the Sloths… Any plans for a Harlan’s dig downstream?

  2. David’s avatar

    Hi Pete, We found it downstream, but that doesn’t mean the rest of the bones, if any, aren’t upstream. I think we’ll rely on Bob to do some preliminary scouting first. He’s got some ideas about where to start looking and should have a report for us when we are out there for the program at the Greater Shenandoah Historical Museum May 30.

  3. David’s avatar

    Link to an interesting article (with a photo) about a Paramylodon trackway inside the Nevada State Penitentiary

  4. Robert’s avatar

    WOW! That is an impressive find. Given all my work on Paramylodon, I wish I’d heard about this sooner.

  5. David’s avatar

    Hi Rob, We’re planning to dig at the site again next week. Join us! Did you ever CT scan any of the bones? This one has an interesting cavity on the distal end.

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