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RE: Propanoplosaurus, nodosaur hatchling natural mold from Maryland

A hatchling holotype ... 


  Jaime A. Headden
  The Bite Stuff (site v2)

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)

"Ever since man first left his cave and met a stranger with a
different language and a new way of looking at things, the human race
has had a dream: to kill him, so we don't have to learn his language or
his new way of looking at things." --- Zapp Brannigan (Beast With a Billion 

> Date: Thu, 8 Sep 2011 15:25:12 +0000
> From: bh480@scn.org
> To: dinosaur@usc.edu
> Subject: Propanoplosaurus, nodosaur hatchling natural mold from Maryland
> From: Ben Creisler
> bh480@scn.org
> In the new issue of Journal of Paleontology:
> Ray Stanford, David B. Weishampel and Valerie B. Deleon
> (2011)
> The First Hatchling Dinosaur Reported from the Eastern
> United States: Propanoplosaurus marylandicus (Dinosauria:
> Ankylosauria) from the Early Cretaceous of Maryland,
> U.S.A.
> Journal of Paleontology 85(5):916-924.
> http://www.bioone.org/doi/abs/10.1666/10-113.1
> Abstract
> Abundant and diverse dinosaur footprints have been
> discovered recently on bedding surfaces of the Lower
> Cretaceous Patuxent Formation of Maryland and Virginia.
> Found along with those ichnofossils is a fossil preserved
> partially as natural casts and partially as natural molds
> of a baby nodosaurid ankylosaur so small as to justify
> interpreting it as a hatchling. Despite the rather
> unusual type of preservation, the find is properly termed
> a body fossil and not an ichnite, per se, because it
> records not the action of an organism, but the body form
> and bone structure (including partial articulation) of a
> dinosaur. We here name it Propanoplosaurus marylandicus
> and provide a description of its diagnostic
> characteristics. Although actual skeletal remains
> referable to P. marylandicus have not been found in the
> Patuxent Formation, other nodosaurids recognized from
> skeletal remains are known from both the Lower and Upper
> Cretaceous strata of the Western Interior of North
> America and Europe. P. marylandicus represents the only
> diagnostic nodosaurid from the Early Cretaceous of the
> eastern U.S.A., provides information on growth patterns
> among nodosaurids, and is the first direct evidence of a
> dinosaur hatchling and, deductively, nesting, on the
> entire eastern
> seaboard