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TitleCollection Number And NamePhoto Number
151 The forearms are pinned in place after the dorsal ribs have been attached.P1048 James H. Madsen Photograph CollectionP1048n096
152 The fossiliferous unit at the C-LDQ, which consists of poorly stratified to blocky, bentonitic shales, is overlain by a dense, hard, siliceous, freshwater limestone. The surface between the two units shows evidence of channeling as seen here. (June 1961)P1048 James H. Madsen Photograph CollectionP1048n018
153 The fused caudal vertebrae and a chevron of Allosaurus show extensive pathology involving the transverse process of the right side. Traumas to the tails of dinosaurs are among the more common pathologies.P1048 James H. Madsen Photograph CollectionP1048n045
154 The last attempt at housing the C-LDQ field crew was a 16 foot square shack that boasted a gas stove and refrigerator, a table, four chairs, and two folding cots. (June 1962)P1048 James H. Madsen Photograph CollectionP1048n011
155 The last step is the touch-up of any nicks and scrapes sustained during transportation and mounting. (October 1988)P1048 James H. Madsen Photograph CollectionP1048n098
156 The left background may be very close to the original Princeton Quarry outline.P1048 James H. Madsen Photograph CollectionP1048nGS07
157 The most demanding step in the study of dinosaurs takes place in the preparation laboratory, where a single bone may require more than a hundred hours of intense work before it can be analyzed in detail.P1048 James H. Madsen Photograph CollectionP1048n041
158 The neck, ribs, chevrons, and forearms are fastened in place as one of the final steps in the assembly.P1048 James H. Madsen Photograph CollectionP1048n095
159 The premaxillae of Marshosaurus to the left, and Stokesosaurus above, each with four teeth are compared with one of a very small Allosaurus to the right, which has alveoli for five teeth. Although all three of these dinosaurs were carnivorous, notice the difference in the shape of the tooth bearing bones. Similarly, if the teeth of each were present, they could be easily identified, one from another. (April 1972)P1048 James H. Madsen Photograph CollectionP1048n066
160 The sacrum and pelvic elements including the pubes, ischia, and ilia, are assembled first.P1048 James H. Madsen Photograph CollectionP1048n090
161 The steel buildings, assembled over the unexcavated Quarry surface in 1979, were an important addition; because they afforded protection from both vandalism and the weather. They were long overdue improvements making it no longer necessary to re-excavate the quarry at the beginning of the field season and then cover it again at the conclusion of work in the late summer.P1048 James H. Madsen Photograph CollectionP1048n015
162 There is a dramatic size range in the skeletons of the Cleveland-Lloyd Allosaurs. On the left are two claws from the forehand (manus), above on the right are premaxillae, tooth bearing bones of the upper jaw, and below caudal vertebrae from the distal third of the tail. The small vertebra is about two inches (five centimeters) long. The smallest Allosaur in the C-LDQ wasunder ten feet in length, the largest nearly thirty five feet long.P1048 James H. Madsen Photograph CollectionP1048n047
163 There were two episodes of mineral replacement or fossilization recorded in the Cleveland-Lloyd dinosaur bones: the first represented by an inner, white layer of sparry calcite lining the marrow cavity in this specimen and the second a layer of pale, amethyst quartz crystals that grew inward from the walls of cavities as seen in some geodes.P1048 James H. Madsen Photograph CollectionP1048n053
164 Theropod tooth, Allosaurus.P1048 James H. Madsen Photograph CollectionP1048nRES08
165 These are fossil bones as discovered and uncovered in place at the Quarry. To one side are some of the tools used by the paleontologists who collect the fossils.P1048 James H. Madsen Photograph CollectionP1048n022a
166 These are two unrelated bones in place. On the left is an ischium of Barosaurus and on the right an ilium of Allosaurus. (July 1961)P1048 James H. Madsen Photograph CollectionP1048n033
167 These chilly dinosaur models: Ceratosaurus, Stegosaurus, and a juvenile Camarasaurus are near the Main Street or south entrance of the Utah Fieldhouse of Natural History in the Vernal City Park. This is the work of Malin Foster, a Utah sculptor. They were unveiled in the 1950s and have stood well the test of time.P1048 James H. Madsen Photograph CollectionP1048n072
168 These colorful, Morrison Formation exposures are similar to the rock outcrops where dinosaur bones are found in many localities across the Colorado Plateau of Utah, New Mexico, and Colorado.P1048 James H. Madsen Photograph CollectionP1048n004
169 These paired, pelvic bones of a large Allosaur are called pubes. They are shown here to illustrate the size of the circular opening at the top, which represents the maximum dimension of the oviduct or birth canal. It appears in this case to have been somewhat close to the diameter of a softball in size. (July 1961)P1048 James H. Madsen Photograph CollectionP1048n025
170 These students digging at the Quarry in 1976 are from Foothill Junior College near San Jose, California. They are learning first hand about the careful work required in collecting dinosaur bones. The Cleveland- Lloyd Dinosaur Quarry is often an important out-of-doors classroom for teaching the fundamentals of vertebrate paleontology and field collecting techniques.P1048 James H. Madsen Photograph CollectionP1048n036
171 This Allosaurus femur, the upper long bone of the hind leg, as found in place at the Quarry, shows displacement at mid-length. Apparently, this was the result of a small, reverse fault having an approximate displacement of about 12 centimeters. The movement occurred long after the enclosing sediments had become lithified, changed to limestone and shale. (July 1961)P1048 James H. Madsen Photograph CollectionP1048n028
172 This close-up of the rough surface of the bony core of a Stegosaur plate shows some of the numerous channels that indicate a rich blood supply. This is consistent with the belief that this animal was capable of thermoregulation, the control of its own body temperature by regulation of the blood flow through parts of the circulatory system.P1048 James H. Madsen Photograph CollectionP1048n054
173 This composite of a medium-sized Allosaur skull required six months of work to fully prepare the fifty or more separate elements of the skull and mandible (lower jaw). It is now in the vertebrate fossil collections of the Utah Museum of Natural History on the University of Utah campus in Salt Lake City, Utah.P1048 James H. Madsen Photograph CollectionP1048n043
174 This dorsal rib is singularly diagnostic of the presence of the rare theropod, Ceratosaurus in the C-LDQ, however, numerous other bones of this individual were found over the years.P1048 James H. Madsen Photograph CollectionP1048n026
175 This fine mural was commissioned by the B.Y.U. Earth Science Museum and prepared by a noted Texas wildlife artist, Doris Tischler. The scene depicts the composite flora and fauna of Late Jurassic time in Utah as recorded in the sediments of the Morrison Formation from several Colorado Plateau localities.P1048 James H. Madsen Photograph CollectionP1048n081
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