The Paper

As usual now for my papers, this is open access and freely available to the world.

Foster, J.R., and Wedel, M.J. 2014. Haplocanthosaurus (Saurischia: Sauropoda) from the lower Morrison Formation (Upper Jurassic) near Snowmass, Colorado. Volumina Jurassica 12(2): 197–210. DOI: 10.5604/17313708 .1130144

SV-POW! posts

Coverage elsewhere

High-resolution figures

Foster and Wedel 2014 fig 1 - locality map

Fig. 1. Gordon-Bramson-Brothers Quarry locality map

Thick line indicates outcrops of the Morrison Formation; quarry indicated by star.

Foster and Wedel 2014 fig 2 - quarry map section and photo

Fig. 2. Gordon-Bramson-Brothers Quarry

A. Quarry map showing association of anterior caudal and posterior dorsal vertebrae around the sacrum. B. Stratigraphic section showing position of the quarry within the Morrison Formation. C. Dragging field jacket containing the sacrum, one caudal, and two dorsal centra in September 2009. View looking north.

Foster and Wedel 2014 fig 3 - dorsals

Fig. 3. MWC 8028, Haplocanthosaurus dorsal vertebrae.

A. Lateral view of dorsal centrum with bottom edge of lateral pneumatic fossa preserved. B. Dorsal view of same centrum as in A, showing the median septum between the paired lateral fossae. C. Lateral view of dorsal centrum with smaller segment of the lateral pneumatic fossa margin preserved. D. Dorsal view of same centrum as in C, again showing the median septum and paired lateral fossae. E. Lateral view of dorsal centrum with partial pleurocoel preserved. F. Cross-sectional (posterior) view of same dorsal as in E. G. Dorsal neural spines in lateral (top) and anterior or posterior (center, bottom) views. Scale bars = 10 cm.

Foster and Wedel 2014 fig 4 - sacrum

Fig. 4. Sacra of Haplocanthosaurus

A. MWC 8028, sacrum in right lateral view. B. MWC 8028, close-up of S4 and S5 centra highlighting pneumatic fossae. C. MWC 8028 with divisions between the vertebrae overlaid. D. CM 879, sacrum in right lateral view with divisions between the vertebrae overlaid. E. CM 572 in right lateral view, after Hatcher (1903c: plate 4). B–E are not shown at the same scale, scale bar for A = 20 cm. Note that the neural arches in CM 572 were restored during preparation, and the sacral neural spines as shown here are probably lower than they would have been in life.

Foster and Wedel 2014 fig 5 - caudals

 Fig. 5. MWC 8028, Haplocanthosaurus, caudal elements

A. Caudal 1(?) in anterior view. B. Caudal 1(?) in posterior view. C. Caudal 1(?) in right lateral view. D. Caudal 1(?), close-up of neural canal in posterior view with the ventral excavation highlighted by the arrow. E. Caudal 2(?) in anterior view. F. Caudal 2(?) in posterior view. G. Caudal 2(?) in left lateral view. H. Caudal 2(?), close-up of neural canal in posterior view with the ventral excavation highlighted by the arrow. I. Caudal 3 or 4 in anterior view. J. Caudal 4 or 5 in anterior view. K. Caudal 4 or 5 in posterior view. L. Chevron in posterodorsal view. Scale bars = 10 cm.

Foster and Wedel 2014 fig 6 - ribs

Fig. 6. MWC 8028, Haplocanthosaurus, ribs

A. Fragments of posterior ribs; the three pieces shown here do not belong to the same rib. B. The most complete posterior rib. C. Cross-section of Camarasaurus torso at the fourth dorsal vertebra (after Osborn, Mook, 1921: fig. 72), with the rib from B overlaid. D. Cross-section of Diplodocus torso at the seventh dorsal vertebra (after Holland, 1910: fig. 17), with the rib from B overlaid. Scale bar = 20 cm.

Foster and Wedel 2014 fig 7 - CTs

 Fig. 7. CT scan image cross-sections of dorsal vertebral centra in MWC 8028 (referred to Haplocanthosaurus; A and B) and in a juvenile Camarasaurus grandis (MWC 2538; C and D)

Interpretive outlines of bone in each centrum below the CT scans. Dorsal centum diameters in all four vertebrae are approximately 15–16 cm. Note procamerate condition of centra in A and B; lower halves of the centra are solid and fossae are shallow. In C and D, the centra are camerate and the arrows point to the contact between the lower and upper edges of the camerae and the infilling matrix. These images contrast the much more pneumatic condition of the dorsal centra of even a juvenile Camarasaurus (C and D) with the more solid construction of the centra of MWC 8028. In CM 572 (H. priscus), the ventral half of each dorsal centrum is solid, as in MWC 8028 (Wedel, 2003, fig. 8; Wedel, 2009, fig. 6).


4 Responses to “Foster and Wedel (2014) on the Snowmass Haplocanthosaurus

  1. […] Second, the figure resolution in the PDF of the Haplocanthosaurus paper is not stellar, so as is the case with almost all of our papers, the full-color, high-resolution figures are available at the paper’s page on the sidebar. […]

  2. […] sacrum, and some surprisingly interesting caudals, it puts me strongly in mind of MWC 8028, the Snowmass Haplocanthosaurus (another John Foster joint: see Foster and Wedel […]

  3. […] and trying to get paleontologists interested. In time she got in touch with John Foster, and the rest is history. Jessica lives in California now, and thanks to John’s efforts we were able to invite her to […]

  4. […] Foster and I described Museum of Western Colorado (MWC) specimen 8028, a partial skeleton of Haplocanthosaurus from […]

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: