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Mosasaur special issue + marine reptile stuff

Ben Creisler

A few items that may be of interest.

The new issue of Netherlands Journal of Geosciences is out online and
is devoted to the 4th Triennial Mosasaur Meeting from 2013. I posted
these papers in advance form with abstracts. They're now published.



Netherlands Journal of Geosciences 94(1): 1-1
doi: 10.1017/njg.2015.10
Michael J. Polcyn and Anne S. Schulp (2015)
Introduction: Proceedings of the 4th Triennial Mosasaur Meeting.
Dallas, Texas, May 20-25, 2013.
Netherlands Journal of Geosciences 94(1): 3-4
doi: 10.1017/njg.2015.9
Sven Sachs, Jahn J. Hornung and Mike Reich (2015)
Mosasaurs from Germany – a brief history of the first 100 years of research.
Netherlands Journal of Geosciences 94(1): 5-18
doi: 10.1017/njg.2014.16
A.S. Schulp and J.W.M. Jagt (2015)
New material of Prognathodon (Squamata, Mosasauridae) from the type
Maastrichtian of the Netherlands.
Netherlands Journal of Geosciences 94(1): 19-21
doi: 10.1017/njg.2014.15
T.L. Harrell and J.E. Martin (2015)
A mosasaur from the Maastrichtian Fox Hills Formation of the northern
Western Interior Seaway of the United States and the synonymy of
Mosasaurus maximus with Mosasaurus hoffmanni (Reptilia: Mosasauridae).
Netherlands Journal of Geosciences 94(1): 23-37
doi: 10.1017/njg.2014.27
T. Ikejiri and S.G. Lucas (2015)
Osteology and taxonomy of Mosasaurus conodon Cope 1881 from the Late
Cretaceous of North America.
Netherlands Journal of Geosciences 94(1): 39-54
doi: 10.1017/njg.2014.28
J.J. Hornung and M. Reich (2015)
Tylosaurine mosasaurs (Squamata) from the Late Cretaceous of northern Germany
Netherlands Journal of Geosciences 94(1): 55-71
doi: 10.1017/njg.2014.31
R. Rabinovich, H. Ginat, M. Schudack, U. Schudack, S.
Ashckenazi-Polivoda and G. Rogolsky (2015)
A late Cretaceous elasmosaurid of the Tethys Sea margins (southern
Negev, Israel), and its palaeogeographic reconstruction.
Netherlands Journal of Geosciences 94(1): 73-86
doi: 10.1017/njg.2014.26
W.B. Gallagher (2015)
Greensand mosasaurs of New Jersey and the Cretaceous–Paleogene
transition of marine vertebrates.
Netherlands Journal of Geosciences 94(1): 87-91
doi: 10.1017/njg.2014.30
R. Araújo, M.J. Polcyn, J. Lindgren, L.L. Jacobs, A.S. Schulp, O.
Mateus, A. Olímpio Gonçalves and M.-L. Morais (2015)
New aristonectine elasmosaurid plesiosaur specimens from the Early
Maastrichtian of Angola and comments on paedomorphism in plesiosaurs.
Netherlands Journal of Geosciences 94(1): 93-108
doi: 10.1017/njg.2014.43
R. Araújo, M.J. Polcyn, A.S. Schulp, O. Mateus, L.L. Jacobs, A.
Olímpio Gonçalves, M.-L. orais (2015)
A new elasmosaurid from the early Maastrichtian of Angola and the
implications of girdle morphology on swimming style in plesiosaurs.
Netherlands Journal of Geosciences 94(1): 109-120
doi: 10.1017/njg.2014.44


The abstract for the Rhomaleosaurus monograph (already mentioned) is
now online as well:

No pdf available:

Smith, Adam S. & Benson, Roger B.J. 2014.
Osteology of Rhomaleosaurus thorntoni (Sauropterygia:
Rhomaleosauridae) from the Lower Jurassic (Toarcian) of
Northamptonshire, England.
Monograph of the Palaeontographical Society London 168(642): 1–40; Plates 1–35

This paper describes the holotype of Rhomaleosaurus thorntoni (NHMUK
PV R4853) from the upper part of the Whitby Mudstone Formation
(Toarcian) of Kingsthorpe Hollow, Northamptonshire, England.
Rhomaleosaurus thorntoni possesses the following autapomorphies: (1)
dorsomedian foramen with mediolaterally narrow slit-like morphology
situated well anterior to the external nares; (2) humerus long
relative to skull length and body length; (3) distal end of humerus
greatly expanded both preaxially and postaxially. Several other
characters present in Rhomaleosaurus thorntoni cannot be determined in
other Rhomaleosaurus species, so these may also be autapomorphies of
R. thorntoni. A summary of previous phylogenetic analyses of
Plesiosauria shows that the relationships among the three main clades
(Rhomaleosauridae, Pliosauridae, Plesiosauroidea) are unclear and
further investigation is required to understand the evolution of early

See as well:



A recent paper for Corosaurus not yet mentioned:

David M. Lovelace & Amalia C. Doebbert (2015)
A new age constraint for the Early Triassic Alcova Limestone
(Chugwater Group), Wyoming.
Palaeogeography, Palaeoclimatology, Palaeoecology 424: 1-5


The 87Sr/86Sr ratios are consistent with global late–Early Triassic
marine rocks.
The basal pistosaurid Corosaurus can now be temporally constrained.
A depositional age of late Olenekian to earliest Anisian (Aegean) is assigned.


The Alcova Limestone is a widely exposed but poorly studied Triassic
unit found throughout Wyoming. Although it is used as a regional
lithostratigraphic marker bed, the age of the limestone is not well
constrained and contention regarding its depositional nature (marine
vs. non-marine saline lake) has not been adequately resolved, although
the marine hypothesis is more widely accepted. Currently, its age is
based on the occurrence of a single basal pistosaurid, Corosaurus

We provide the first 87Sr/86Sr analysis of the Alcova Limestone. The
data strongly support a marine origin for this unit. Furthermore, the
data provide an age range, based on their placement on the marine
strontium curve, that limits the deposition of the Alcova Limestone to
the latest Olenekian to earliest Anisian (Early Triassic–Middle
Triassic boundary). This placement is consistent with the timing of
the Spathian regression recorded in other transitional marine to
non-marine strata of the western USA.