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How the Grinch stole the papers



Pascaline Lauters, Yuri L. Bolotsky, Jimmy Van
Itterbeeck, and Pascal Godefroit, 2008. Taphonomy and
age profile of a latest Cretaceoous dinosaur bone bed
in Far Eastern Russia. Palaios 23: 153-162

Abstract : A large dinosaur bone bed has been
investigated in the Udurchukan Formation (?late
Maastrichtian) at Blagoveschensk, Far Eastern Russia.
The observed mixture of unstratified fine and coarse
sediments in the bone bed is typical for
sediment-gravity-flow deposits. It is postulated that
sediment gravity flows, originating from the uplifted
areas at the borders of the Zeya-Bureya Basin,
reworked the dinosaur bones and teeth as a
monodominant bone bed. Fossils of the lambeosaurine
Amurosaurus riabinini form >90% of the recovered
material. The low number of associated skeletal
elements at Blagoveschensk indicates that the
carcasses were disarticulated well before reworking.
Although shed theropod teeth have been found in the
bone bed, <2% of the bones exhibit potential tooth
marks; scavenging activity was therefore limited, or
scavengers had an abundance of prey at hand and did
not have to actively seek out bones for nutrients.
Perthotaxic features are very rare on the bones,
implying that they were not exposed subaerially for
any significant length of time before reworking and
burial. The underrepresentation of light skeletal
elements, the dislocation of the dental batteries, and
the numerous fractured long bones suggest that most of
the fossils were reworked. The random orientation of
the elements might indicate a sudden end to transport
before stability could be reached. The size frequency
distributions of the femur, tibia, humerus, and
dentary elements reveal an overrepresentation of late
juveniles and small subadult specimens, indicative of
an attritional death profile for the Amurosaurus
fossil assemblage. It is tentatively postulated that
the absence of fossils attributable to nestling or
early juvenile individuals indicates that younger
animals were segregated from adults and could join the
herd only when they reached half of the adult size.


      
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