The discovery in Surrey of Baryonyx walkeri in 1983 was a highly significant event that reinvigorated the study of British Dinosaurs. In
the 1990’s isolated vertebrae and teeth plus a phalanx confirmed the presence of spinosaurids on the Isle of Wight. The Island’s Wessex
Formation includes plant debris beds which are the richest dinosaur containing deposits in Europe. Systematic sieving of these beds has
yielded many spinosaurid teeth. However collectors have recently made some highly important finds from a site on the Island’s south-
west coast. These include substantial sections of the crania of at least two individuals. The area is heavily collected and unfortunately
some material has not come to the collection although the majority is now in the care of Dinosaur Isle Museum. Future research will in-
clude a description of the cranial osteology and dental morphology as well as CT scanning to establish the endocranial anatomy and re-
lationship of the trigeminal nerve to the numerous pits on the premaxillae, maxillae and dentaries.
One of the skulls is approximately 10% bigger than the other. The larger is referred to as ‘Bary.1’ and the smaller as ‘Bary.2’. Many of
the skull fragments in the collection are not illustrated here.
TEETH A. ‘Baryonyx’ teeth and skull fragments found on the beach at Chilton Chine on the southwest coast
of the Isle of Wight. B. Apical root profile. C & D IWCMS : 2002.6. C. A basal part of the distal carina to show
tail-like termination. D. Lateral view. E. IWCMS : 2002.7 Juvenile spinosaurid tooth crown in lateral view. F.
IWCMS : 2002.8 Premaxillary or anterior maxillary tooth crown in mesolateral view. D & F from bed L6 c.
250m southeast of Chilton Chine. E from bed L9 exposed at beach level west of Grange Chine.
ABBREVIATIONS: bo basiocciput; bpt basipterygoid process of the basisphenoid; bs basisphenoid; ct cultriform process of the
paraspenoid; la lacrimal; ls lateral sphenoid; f frontal; oc occipital condyle; p parietal; pap paroccipital process; pro prootic; so supraoccipi-
Radley, J. D. & Barker, M.J. 1998. Stratigraphy, Palaeontology and correlation of the Vectis Formation (Wealden Group, Lower Cretaceous)
at Compton Bay, Isle of Wight, Southern England. Proceedings of the Geologist’s Association. 109. 187-195.
Sweetman, S.C. 2011. The Wealden of the Isle of Wight. In: Batten, D.J. (Ed.), English Wealden Fossils. Palaeontological Association, Field
Guides to Fossils Series, 14. 69-71.
The Wealden Group of the Isle of Wight comprises the Barremian Wessex For-
mation and the overlying late Barremian earliest Aptian Vectis Formation. The
former is primarily composed of varicoloured overbank mudstones and siltstones
with interbedded fluvial sandstones. It also incorporates plant debris beds, the
main source of vertebrate fossils (Sweetman 2011). The latter represents deposi-
tion in a shallow coastal lagoon (Radley & Barker1998).
FOSTER SPECIMEN Posterioventral section of the skull and brain case presumed
from Bary.2 and associated with the dorsal section, comprised of parietals and frontals
found a few meters away.
B. Premaxilla left lateral view (Bary.1)
A. Premaxilla ventral view (Bary.1)
C. Premaxilla ventral view (Bary.2)
Reconstruction of ‘Baryonyx’
skull by Andrew Cocks based
principally on Baryonyx walk-
eri and Suchomimus tenerensis.
D. Premaxilla anterior
F. Distal dentary
left lateral view
Near right: Dorsal view of pos-
terior skull of Bary.2.
Far right: Posterior and right
lateral views of the brain case of
Bary.1 (IWCMS 2014.95).
E. Left maxilla in medial view (? Bary.1)
A-F: ICMWS : 2014.95
Scale bar = 50mm
CT Figure 1.: 3D rendering of Bary.1
shown from a posterior right lateral
view with the two blocks virtually fit-
CT Figure 2.: 3D rendering of Bary.1
shown from a direct right lateral view
with the two blocks virtually fitted to-
In both figures the lower block is
shown as a preliminary segmentation
dilated by three voxels, whereas the
upper block is shown in raw state with
a manipulated opacity curve.
CT Figure 1.
CT Figure 2.
University of Southampton µ-VIS X-ray imaging centre.
CT scanning methods.
Four micro-focus X-Ray computed tomography (µ-CT) scans were car-
ried out using the custom 450\225kVp HUTCH CT scanner at the µ-VIS
X-Ray imaging centre to cover both the upper and lower blocks of
‘Bary.1’ . The X-Ray conditions were set to 320kVp and 675µA, with 2
mm of Cu filtration. During each µ-CT scan the specimens were rotated
through 360° whilst 3142 projections were collected averaging 16 frames
per projection with an exposure time of 250 ms. Each resulting volume
has a voxel (cubic pixel) resolution of 135.4 µm. The raw data was pro-
cessed using VGStudio MAX 2.1 (volume graphics GmbH, Germany) to
segment the fossilised bone from the matrix