Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 28 for “"trace fossils"”.
-
Ichnotaxonomic assessment of Mazon Creek area trace fossils, Illinois, USA
… organisms preserved within siderite concretions. Trace fossils, though less well known, also occur in concretions. Several hundred trace-fossil-bearing concretions were examined from collections at The Field Museum, Chicago, and The University of Kansas Natural History Museum, Lawrence. …
-
Investigating Microbial Trace-fossils and Abiotic Alteration in Hydrovolcanic Tuffs of the Fort Rock Volcanic Field, Oregon
Microbial ichnofossils in volcanic rocks provide a significant record of subsurface microbes and potentially extraterrestrial biosignatures. Here, the textures, mineralogy, and geochemistry of two continental basaltic hydrovolcanic deposits - Reed Rocks and Black Hills - in the Fort Rock Volcanic …
-
Revision and description of Keuper (Middle Ladinian to Rhaetian) invertebrate trace fossils from the southern part of the Germanic Basin and studies of related material
The invertebrate trace fossils from the Keuper (Upper Triassic) of the southern part of the Germanic Basin are revised. The Keuper sediments of the Germanic Basin are predominantly composed of rocks representing various nonmarine environments dominated by red-bed facies. The Würzburg Formation, the …
-
SEDIMENTOLOGY, ICHNOLOGY, AND SEQUENCE STRATIGRAPHY OF THE MIOCENE OFICINA FORMATION, ORINOCO OIL BELT, EASTERN VENEZUELA BASIN
… aspects. Sedimentary facies, trace fossils, depositional environments, stratal stacking patterns and surfaces of sequence stratigraphic significance have been analyzed in the Junín and Boyacá areas. The Oficina Formation is subdivided here into three members: Lower, Middle, and …
-
THE ICHNOLOGICAL AND DEPOSITIONAL CONTEXT OF BIOERODED TRICERATOPS BONES FROM THE MAASTRICTHIAN FRENCHMAN FORMATION OF SOUTHERN SASKATCHEWAN, CANADA
Previous studies on osteic bioerosion trace fossils on dinosaur bones have contributed to our understanding of Mesozoic terrestrial paleoecology and depositional environments. In many cases, body fossils of the inferred tracemaker are either exceedingly rare or absent from the fossil record due to …
-
Stratigraphy and depositional environments of the Fox Hills Formation (Upper Cretaceous), Bowman County, North Dakota
<p> The sedimentary structures, trace fossils, and lithology of the Upper Cretaceous Fox Hills Formation in Bowman County, North Dakota, were studied during the summer of 1979 and the spring of 1983. Twenty-three stratigraphic sections were measured and described and lithologic samples were …
-
Geology of the Flathead Formation (Middle Cambrian) on the perimeter of the Bighorn Basin, Beartooth Mountains, and Little Belt Mountains in Wyoming and Montana
… parallel-bedded, quartz sandstone. </p><p> Trace fossils are present in the middle and upper intervals. Skclithos, Monocraterion, and Rusophycus have been identified. Horizontal tubes on bedding planes are the most common trace fossils. Large vertical tubes containing smaller Skolithos tubes …
-
A Uintan (Late Middle Eocene) Flora and Fauna from the Uinta Basin, Utah
… collection of plant, invertebrate, and vertebrae fossils from the Uinta Formation in the Uinta Basin, south of Myton, Utah, USA, provides evidence of environmental change. Paleobotanical specimens are preserved in late stage Uinta Lake sediments and coarse-grained fluvial sediments which are …
-
NEOICHNOLOGY OF BATS: MORPHOLOGICAL, ECOLOGICAL, AND PHYLOGENETIC INFLUENCES ON TERRESTRIAL BEHAVIOR AND TRACKMAKING ABILITY WITHIN THE CHIROPTERA
… to establish criteria for identification of bat trace fossils in the geologic record, and eventually used for comparisons to pterosaur trace fossils to better understand their locomotor behaviors. As the only extant quadruped capable of powered flight, bats are likely the closest living analog …
-
Ichnology and sedimentology of large tetrapod burrows in the latest Early Triassic Katberg Formation, south-eastern main Karoo Basin, South Africa
Trace fossils in the form of large (~11 cm diameter and up to 2 m in length) burrows were studied at three localities in the Early Triassic Katberg Formation in the south-eastern and central parts of the main Karoo Basin, Eastern Cape, South Africa. The most interesting site, Hobbs Hill, northwest …
-
An investigation of terrestrial arthropod herbivory in Pennsylvanian peat forests revealed by coprolites from coal balls
… past. By situating coprolites as integrative trace fossils, this work advances our understanding of the structure and function of Pennsylvanian peat swamp ecosystems.
-
Tidal sedimentation in the mid-Pennsylvanian Breathitt Group, eastern Kentucky
… and mudstone. Primary sedimentary structures, trace fossils, vertical successions of facies, and sediment body geometries suggest that these sediments were deposited in a delta-front/distributary-mouth-bar setting. Within the study area, the Magoffin Member ranges in thickness from 20 to 40 m. …
-
Carbonate ramp to deeper shale-shelf transitions of an Upper Cambrian (Dresbachian) shelf embayment, Nolichucky Formation, southwest Virginia
… deposits); and shaly packstone/wackestone with trace fossils, glauconite horizons, hardgrounds, and erosion/truncation surfaces. A 15 m thick tongue of cyclic carbonates within the shale package contains subtidal calcareous algal, digitate "stromatolite” bioherms and ooid packstones which …
-
The Lungfish Gnathorhiza and Its Burrows From the Permian of Kansas
Gnathorhiza is represented by both trace and body fossils in the Kansan Lower Permian (Speiser Shale). At the Junction City locality, burrows allow a refinement of the interpretation of the behavior and life habits of the lungfish Gnathorhiza. Gnathorhiza withdrew from adverse environmental …
-
From grains to tracks: high-resolution sedimentology of track-bearing Stormberg strata, southern Africa
… main Karoo Basin of southern Africa, diverse trace fossils, primarily comprising Upper Triassic– Lower Jurassic dinosaur tracks, are preserved. Extensive studies have been carried out to document these individual tracksites and to examine the variations between sites and through time, with …
-
Redefining the Treptichnus pedum zone at the Global Boundary Stratotype Section and Point (GSSP): A critical reassessment of the Ediacaran-Cambrian boundary.
… Due to the paucity of the body-fossil record, trace fossils often offer the only available insight into these evolutionary milestones, representing a continuous record through the late Ediacaran-early Cambrian. The Chapel Island Formation (CIF) of the Burin Peninsula, Newfoundland, provides an …
-
Sedimentology, Stratigraphy and Reservoir Characterization of the Middle Jurassic Upper Shaunavon Member in Southwestern Saskatchewan
… are indicated by low-diversity, diminutive trace fossils as well as synaresis cracks. Facies Association 2 was deposited in inner shelf fully marine wave dominated conditions indicated by Cruziana Ichnofacies. Facies Association 3 formed as the result of a base level drop, resulting in …
-
Paleontology and stratigraphy of the Niobrara Formation (Upper Cretaceous) of eastern North Dakota with emphasis on the calcareous nannoplankton
… age of the strata, and early diagenesis. Macrofossils include Lingula, ammonites, and four bivalve taxa, including the abundant oyster, Pseudoperna congesta, and fragments and prisms of inoceramids. Trace fossils include non-pyritized burrows (Chondrites) and pyritized burrows (Planolites …
-
Paleosol evolution in a sequence stratigraphic framework, Cretaceous Ferron Notom Delta, south central Utah, U.S.A.
… coals and carbonaceous strata. Associated marine trace fossils above coal beds suggest marine transgression due to compactional subsidence or eustatic sea-level rise. The similarity in the scale of cyclicity in fluvial aggradation cycle sets (10Ka) and marine parasequences of the Ferron Notom …
Page 1 of 2