North Horn
Description
Source: Wikipédia
The North Horn Formation is a widespread non-marine sedimentary unit with extensive outcrops exposed in central and eastern Utah. The formation locally exceeds 3,600 feet (1,100 m) in thickness and is characterized by fluvial, lacustrine, and floodplain dominated systems, representing a terrestrial, high energy, depositional environment. The sediments date from Late Cretaceous (Maastrichtian) to early Paleocene in age and include the K-Pg extinction event boundary; however, this boundary is extremely difficult to locate and there is no strong stratigraphic evidence available that indicates a specific marker bed such as an iridium rich clay layer. Thus far, the only visible evidence is represented in the form of faunal turnover from dinosaur to mammal-dominated fossil assemblages. Taxa from the Cretaceous part of the formation include squamates, testudines, choristoderes, crocodyliforms, sharks, bony fishes, amphibians, mammals, dinosaurs, eggshell fragments, trace fossils, mollusks, plant macrofossils, such as wood fragments, and palynomorphs.
Découvertes
Source: The Paleobiology Database
Site(s) correspondant(s) à cette formation: 15
Lower Coal Sequence (Unit 3, 160 - 199 meters) North Horn Mountain : Utah - Emery 4413 North Horn Mountain (Sections 3, 4, 33, 34, 35, and 36, T.18S and T.19S., R.6E., Salty Lake Base Line and Meridian (SLBM)
Lat. Long. at Joes Valley Reservoir.
- North Horn Mountain : Utah - Emery 1226 13291 82296
- southwest toe, North Horn Mountain : Utah - Emery 12090 14585 63054 65451 SW toe of North Horn Mtn., Manti National Forest, Emery Co., UT
- west side, North Horn Mountain : Utah - Emery 12090 13014 14585 49058 63054 far W side of North Horn Mtn, Emery Co., UT
- Torosaurus utahensis identifié comme ? Arrhinoceratops utahensis n. sp.
- Ceratopsia
- hadrosaur, North Horn Mountain : Utah - Emery 12090 38108 61518 North Horn Mtn, Emery Co., UT
- South Dragon Canyon, "lizard locality" : Utah - Emery 12090 13291 14585 33033 38108 S 1/2, Sec 17, T19S, R6E; South Dragon Valley
- Alamosaurus locality, South Dragon Valley : Utah - Emery 12090 13291 South Dragon Valley, North Horn Mtn, Emery Co., UT; NE 1/4, Sec 12, T19S, R5E
- ceratopsian, west side, North Horn Mountain : Utah - Emery 12090 38108 T18S,R6E,sec36, SW 1/4; W side of North Horn Mtn
- southwest spur, North Horn Mountain : Utah - Emery 12090 13014 49058 SW spur of North Horn Mtn, Emery Co., UT
- North Horn eggshell site, Zone 1 : Utah - ? 14289 27285 33033 53964
- North Horn eggshell site, Zone 2 : Utah - ? 14289 27285 33033 53964
- North Horn eggshell site, Zone 3 : Utah - ? 14289 27285 33033 53964 200 ft in a northwesterly direction from Zones 1 and 2.
- North Horn hadrosaur : Utah - ? 14289 33033
- Cottonwood Creek tracksite : Utah - Emery 31984 vicinity of Cottonwood Creek, 10 miles NW of Castle Dale
- southeast of Flagstaff Peak : Utah - Emery 79241 southeast of Flagstaff Peak, in secs. 29 and 30, T. 20 S., R. 6 E, ca. 10 mi. W of the earlier dinosaur localities on North Horn Mtn.; also indicated on map as locality 1 - highest dinosaur bone, W part of sec. 29
Publication(s)
La base comprend 18 publication(s).
Source: The Paleobiology Database
- ↑1 2 R. Difley and A. A. Ekdale. 1999. Biostratigraphic aspects of the Cretaceous-Tertiary (KT) boundary interval at North Horn Mountain, Emery County, Utah. Utah Geological Survey Miscellaneous Publication 99-(1):389-398
- ↑1 2 R. L. Cifelli, R. L. Nydam, and J. G. Eaton, J. D. Gardner, J. I. Kirkland. 1999. Vertebrate faunas of the North Horn Formation (Upper Cretaceous–Lower Paleocene), Emery and Sanpete counties. Vertebrate Paleontology in Utah. Utah Geological Survey Miscellaneous Publication 99-1:377-388
- ↑1 2 3 E. S. Bray. 1999. Eggs and eggshell from the Upper Cretaceous North Horn Formation, central Utah. Vertebrate Paleontology in Utah, Utah Geological Survey Miscellaneous Publication 99-1
- ↑1 G. S. Paul, W. S. Persons, and J. Van Raalte. 2022. The tyrant lizard king, queen and emperor: multiple lines of morphological and stratigraphic evidence support subtle evolution and probable speciation within the North American genus Tyrannosaurus. Evolutionary Biology 49(2):156-179 (https://doi.org/10.1007/s11692-022-09561-5)
- ↑1 2 Anonymous. 1937. Pasture of giant dinosaurs unearthed in Utah. Science Digest 2(5):65
- ↑1 2 3 4 5 6 7 8 9 C. W. Gilmore. 1946. Reptilian fauna of the North Horn Formation of central Utah. United States Department of the Interior Geological Survey Professional Paper 210-C:29-53 (https://doi.org/10.3133/pp210c)
- ↑1 2 3 4 5 C. W. Gilmore. 1938. Fossil hunting in Utah and Arizona. Explorations and Field-Work of the Smithsonian Institution in 1937 3480:1-4
- ↑1 2 C. W. Gilmore. 1939. A review of recent progress in reptilian paleontology. Bulletin of the Geological Society of America 50:337-348 (https://doi.org/10.1130/gsab-50-337)
- ↑1 2 R. M. Sullivan, A. C. Boere, and S. G. Lucas. 2005. Redescription of the ceratopsid dinosaur Torosaurus utahensis (Gilmore, 1946) and a revision of the genus. Journal of Paleontology 79(3):564-582 (https://doi.org/10.1666/0022-3360(2005)079<0564:rotcdt>2.0.co;2)
- ↑1 2 H. Tyson. 1981. The structure and relationships of the horned dinosaur Arrhinoceratops Parks (Ornithischia: Ceratopsidae). Canadian Journal of Earth Sciences 18(8):1241-1247 (https://doi.org/10.1139/e81-115)
- ↑1 2 3 4 5 C. L. Gazin. 1940. The third expedition to central Utah in search of dinosaurs and extinct mammals. Explorations and Field-Work of the Smithsonian Institution in 1939 3586:5-8
- ↑1 D. B. Weishampel and J. B. Weishampel. 1983. Annotated localities of ornithopod dinosaurs: implications to Mesozoic paleobiogeography. The Mosasaur 1:43-87
- ↑1 2 3 4 5 J. A. Jensen. 1987. New brachiosaur material from the Late Jurassic of Utah and Colorado. Great Britain Naturalist 47(4):592-608
- ↑1 2 3 4 5 6 7 8 J. A. Jensen. 1966. Dinosaur eggs from the Upper Cretaceous North Horn Formation of central Utah. Bringham Young University Geology Studies 13:55-67
- ↑1 2 3 H. K. Erben, J. Hoefs, and K. H. Wedepohl. 1979. Paleobiological and isotopic studies of eggshells from a declining dinosaur species. Palaeontology 5(4):380-414 (https://doi.org/10.1017/s0094837300016900)
- ↑1 2 3 J. A. Jensen. 1969. Discovery of extensive dinosaur egg materials in the Upper and Lower Cretaceous of Utah. Geological Society of America Special Paper 121:607-608
- ↑1 2 M. G. Lockley. 1999. Pterosaur and bird tracks from a new Late Cretaceous locality in Utah. Vertebrate Paleontology in Utah, Utah Geological Survey Miscellaneous Publications 99-1:355-359
- ↑1 2 E. M. Spieker. 1960. The Cretaceous-Tertiary boundary in Utah. International Paleontological Union, International Geological Congress (21st session)
Galerie d'image
Pas d'image.