151 - 175 of 213
Number of results to display per page
151 Senator Moss reconsiders and returns the prescious stone to the Quarry.Image
152 Size extremes of premaxillae, unguals, and distal caudals of Allosaurus.Image
153 Small crowd gathering around the "fox-hole" opened up by Bob Randolph, Russ Peterson, and Jack Winkler.Image
154 Some fossil bones from the C-LDQ, such as this left premaxilla of Allosaurus, require minimal or no special preparation in the laboratory, but such is the exception rather than the rule.Image
155 Southerly view of quarry ca. 1961(?).Image
156 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.Image
157 Stokesosaurus, a recently discovered and described Utah dinosaur, to date known only from the Cleveland-Lloyd Quarry, has a peculiar ilium (hip bone) that exhibits a small, vertical ridge at midlength of the outer surface. Sometimes a single character, such as this, is the only clue to the identity of a particular dinosaur, which allows scientists to separate it from other similar types.Image
158 Students of Foothill Junior College near San Jose, CA. 1976.Image
159 Tail spike(?), Stegosaurus.Image
160 Test holes were carefully dug by hand to determine the vertical and lateral dimension of the fossiliferous unit in the Quarry. Subsequently, drill holes confirmed the suspicion that the bones do not extend very far beyond the confines of the metal buildings that now cover and protect the Quarry. The buildings are an absolute necessity to protect the exposed fossils from both vandalism, the harsh winter weather of east-central Utah, and theft.Image
161 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.Image
162 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.Image
163 Theropod tooth, Allosaurus.Image
164 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.Image
165 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)Image
166 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.Image
167 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.Image
168 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)Image
169 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.Image
170 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)Image
171 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.Image
172 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.Image
173 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.Image
174 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.Image
175 This is a close-up photograph of a sample from the locality, where dinosaur "stomach contents" were described over three decades ago. Scientists now re-examining the site suspect that it may be a fairly large mat of fossilized vegetation, including wood fragments and seeds, and containing the bones of the sauropod dinosaur, Camarasaurus.Image
151 - 175 of 213