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20 results for “San Juan Basin”
Aerial view of part of the Bisti badlands from an elevation of approximately 8500 feet. Exposed here are the Upper Cretaceous Fruitland and Kirtland Formations. Photograph taken the morning of 13 April 1992. Copyright © Paul L. Sealey. 1992. in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
Aerial view of part of the Bisti badlands from an elevation of approximately 8500 feet. Exposed here are the Upper Cretaceous Fruitland and Kirtland Formations. Photograph taken the morning of 13 April 1992. Copyright © Paul L. Sealey. 1992.
FIGURE 2 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 2. Changing nomenclature of the Fruitland and Kirtland Formations. Note that older authors placed the Naashoibito Member within the Ojo Alamo Sandstone and that the boundary between the Fruitland and Kirtland Formations has been placed at the top of the Bisti Member (Bauer. 1916: Reeside. 1924). at the top of the highest thick coal (Fassett and Hinds, 1971) and herein at the base of the Bisti Member.
Data from: Early Paleocene tropical forest from the Ojo Alamo Sandstone, San Juan Basin, New Mexico, USA
Earliest Paleocene megafloras from North America are hypothesized to be low diversity and dominated by long-lived cosmopolitan species following the Cretaceous-Paleogene (K/Pg) mass extinction. However, megafloras used to develop this hypothesis are from the Northern Great Plains of North America, and relatively little is known about floras from southern basins. Here, we present a quantitative analysis of an earliest Paleocene megaflora (<350 kyr after K/Pg boundary) from the Ojo Alamo Sandstone in the San Juan Basin (SJB), New Mexico. The megaflora, comprised of 53 morphotypes, was dominated by angiosperms, with accessory taxa composed of pteridophytes, lycophytes, and conifers. Diversity analyses indicate a species rich, highly uneven, and laterally heterogeneous flora. Paleoclimate estimates using multivariate and univariate methods indicate warm temperatures and relatively high precipitation consistent with a modern tropical seasonal forest. When compared to contemporaneous floras from the Denver Basin (DB) of Colorado and the Williston Basin (WB) of North Dakota, the SJB flora had significantly higher species richness but lower evenness. Paleoclimate estimates from the SJB were 7-14 °C warmer than the DB and WB, indicating a shift from a temperate forest in the Northern Great Plains to a tropical forest in the SJB. These results demonstrate the presence of a latitudinal floral diversity and paleoclimatic gradient during the earliest Paleocene in western North America. We hypothesize that the warm, wet conditions in the earliest Paleocene SJB drove rapid rates of speciation following the K/Pg boundary resulting in a diverse and heterogenous flora.
Data from: Early Paleocene tropical forest from the Ojo Alamo Sandstone, San Juan Basin, New Mexico, USA
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Data from: Examination of a historic collection of isolated cranial and appendicular hadrosaurid material from the lower Kirtland Formation of the San Juan Basin, New Mexico
The Field Museum of Natural History collection contains several isolated hadrosaurid specimens collected by Charles H. Sternberg from the lower Kirtland Formation of the San Juan Basin, New Mexico, that have been previously overlooked. Cranial elements described herein consist of a dentary and three jugals while appendicular material is limited to two humeri and two pubes. Many of the specimens preserve taxonomically informative characters that show strong affinities with Kritosaurini but are distinct from Kritosaurus navajovius (Brown, 1910) suggesting that the saurolophine-dominated San Juan Basin diversity is greater than currently recognized. Future examination of currently unprepared material will add to our developing understanding of the ambiguous hadrosaurid diversity of the San Juan Basin.
Distribution. Known only from two localities in Loreto Department, NE Peru (Nuevo San Juan and Sierra del Divisor); it might be widely distributed in Amazon Basin. in Phyllostomidae
Distribution. Known only from two localities in Loreto Department, NE Peru (Nuevo San Juan and Sierra del Divisor); it might be widely distributed in Amazon Basin.
Data from: Examination of a historic collection of isolated cranial and appendicular hadrosaurid material from the lower Kirtland Formation of the San Juan Basin, New Mexico
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FIGURE 12 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 12. Representative fossil vertebrates of the Late Cretaceous (Maastrichtian) Alamo Wash local fauna. Naashoibito Member of the Kirtland Formation, San Juan Basin. New Mexico (from Lucas, 1989). A. Baenid turtle Neurankylus eximius, plastron (left) and carapace (right) (after Gaffney). B. Holotype left scapula of sauropod dinosaur Alamosaurus sanjuanensis (after Gilmore). C, Skull of theropod dinosaur Albertosaurus (after Russell), which is represented by fragmentary specimens in the Alamo Wash local fauna. D, Small Pentaceratops-like ceratopsian represented by the holotype skull of Pentaceratops fenestratus and an indeterminate ceratopsian skeleton (after Wiman). E, Left M, of multituberculate mammal Essonodon browni, occlusal (left) and side (right) views (after Lehman). F, Hadrosaurian dinosaur Parasaurolophus represented by the holotype skeleton of P. cyrtocristatus (after Ostrom) from the Fruitland Formation. Parasaurolophus is represented in the Alamo Wash local fauna by the holotype skull of A tubicen. Scale bars are 10 cm for A-B, 0.5 m for C, 1 m for D and F and 2 mm for E.
FIGURE 10 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 10. Comparison of the left ilia of (A) Kritosaurus navajovius (reversed from Parks, 1920) and (B) Hadrosaurus foulki (from Lull and Wright, 1942), illustrating the distinctly different morphology of this element in the two genera,
FIGURE 8. Dinosaur bones from the Fruitland and Kirtland Formations. A in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 8. Dinosaur bones from the Fruitland and Kirtland Formations. A, Chevron of indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in posterior view. B-C, Ribs of indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in medial view with healed fractures D-E, Edmontosaurus saskatchewanenss, right humerus (NMMNH P-1041) from the Naashoibito Member of the Kirtland Formation in posterior (D) and anterior (E) views F, Posterior left tibia and astragalus of indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in posterior view. G Left femur of indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in posterior view. H. Articulated left metatarsals 2 and 3 of an indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in anterior view. I-J, Indeterminate nodosaurid osteoscutes (NMMNH P-1078) from the Naashoibito Member of the Kirtland Formation in dorsal view. K-L, Indeterminate nodosaurid osteoscutes (NMMNH P-20880) from the upper Fruitland Formation in dorsal view. M, Third phalanx of fourth digit of pes of a tyrannosaurid (NMMNH P-20879) from the Naashoibito Member of the Kirtland Formation Scale bars are 10 cm except for G (50 cm) and I (1 cm).
FIGURE 7 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 7. Semiquantitative diagram showing distribution of fossil vertebrate localities in the Fruitland and Kirtland Formations of the Hunter Wash/De-nazin/Willow Wash drainage. Data from Kues et al. (1977), O'Sullivan et al. (1979), Scott et al. (1979). Brown (1982) and NMMNH locality files. Abbreviations are: KKB, Bisti Member of Kirtland Formation; KKD, De-na-zin Member of Kirtland Formation; KKF, Farmington Member of Kirtland Formation; KL. Lewis Shale; KPC, Pictured Cliffs Sandstone; TOA, Ojo Alamo Sandstone; TN, Nacimiento Formation.
FIGURE 9 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 9 Cranial elements of the hadrosaurid Edmontosaurus saskatchewanensis (NMMNH P-1041) from the Naashoibito Member of the Kırtland Formation A-B, Left jugal in medial (A) and lateral (B) views. C-D, Right jugal in lateral (C) and medial (D) views. E-F Dentary tooth with terminal wear facet in occlusal (E) and mesial views. G-H, Dentary tooth and attached fragment of dentary in occlusal (G) and mesial (H) views. I- J Right jugal in posteromedial (I) and anterolateral (J) view. K-L, Left quadrate in posteromedial (K) and anterolateral (L) views. M. Left maxilla in medial view. N, Right maxilla in lateral view. Scale bars are 10 cm except E-H (1 cm).
FIGURE 5 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 5. Aerial view, looking approximately north, of outcrops of the Fruitland Formation (KF). The Bisti member of the Kirtland Formation (KKB), including its type section (KKB(T)) and a portion of the type section of the Hunter Wash Member of the Kirtland Formation (KKH), along Hunter Wash. San Juan County, New Mexico. The upper left of the photograph is in sec. 29. T24N, R13W and the lower right is in sec. 3, T23N, R13W. Dip is to the northeast. Photograph is copyrighted by Paul L. Sealey and is used with permission.
FIGURE 6 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 6. Cross sections across the San Juan Basin from northwest to southeast showing how differing use of nomenclature of Fruitland and Kirtland Formations affects ideas of a pervasive unconformity at the base of the Ojo Alamo sandstone (adapted from Fassett and Hinds. 1971, plate 2). A, Nomenclature of Fassen and Hinds (1971) suggesting angular unconformity at the base of the Ojo Alamo Sandstone because of progressive southwestward truncation of the Farmington and Dena-zin Members of the Kirtland Formation and the Kirtland Formation undivided. B. Nomenclature of this report, indicating that there is no angular unconformity at the base of the Ojo Alamo Sandstone because the Kirtland Formation is continuous across the basin and most depositional thinning is caused by the pinching out of the Farmington Member (after Hunt, 1984, plate 1). Abbreviations are: H. Huerfanito Bentonite Bed; KF. Fruitland Formation; KKB, Bisti Member of Kirtland Formation; KKD, De-na-zin Member of Kirtland Formation; KKF. Farmington Member of Kirtland Formation; KKHW, Hunter Wash member of Kirtland Formation; KKU. Kirtland Formation undivided; KPC, Pictured Cliffs Sandstone.
FIGURE 13 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 13. Representative fossil vertebrates of early Paleocene Puerco fauna. Nacimiento Formation. San Juan Basin. Mew Mexico (fromi Lucas,1989). A, Plastron (left) and carapace (right) of baenid turtle Compsemys victa (after Gaffney). B. Skull of crocodilian Allognathosuchus meeki. dorsal (left) and ventral (right) views (after Enckson).C. Part of lower jaw of anguid lizard Odaxosaurus piger (after Estes). D, Skull of multituberculate mammal Taeniolabis taoensis (after Sloan). E. Skull of periptychine condylarth Ectoconus ditrigonus (after Matthew). F, Skull and lower jaws of arctocyomd and condylarth Loxolophus hyattianus (after Matthew). G. Upper (above) and lower (below) cheek teeth of anisonchine condylarth Hemithlaeus kowalevskianus (after Matthew). Scale bars are 5 cm for A-B, D-F and 5 mm for C and G.
FIGURE 4 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 4. Geophysical log of Standard Oil of Texas Navajo Tribal 9-1 (sec 9, R15W, T27N) showing prominence of Bisti Member of Kirtland Formation (indicated by B). Huerfanito Bentonite Bed is indicated by H.
FIGURE 3 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 3 Type section of the Bisti Member of the Kirtland Formation. Abbreviations KF, Fruitland Formation; KKB, Bisti Member of the Kirtland For mation.
FIGURE 11 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 11. Lithology, nomenclature, distribution of faunas and age of the uppermost Cretaceous and earliest Tertiary strata of the San Juan Basin. The magneto stratigraphic zonation scheme for the Fruitland and Kirtland Formations is obviously in error. Abbreviations: E. Epoch: lma, "land mammal age"; P, Period.
FIGURE 1 in Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico
FIGURE 1. Distribution of the Fruitland and Kirtland Formations in northwestern New Mexico and location of some of the principal dinosaur collecting areas.
Neural network predicted phase arrival times for stations within and around San Juan Basin
<p>Neural network predicted phase arrival times for stations within and around San Juan Basin. This dataset is not manually reviewed and may contain a large number of false positives.</p>
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