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.
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Showing 1 to 20 of 85 for “"Late Miocene"”.
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Eurasian Middle and Late Miocene Hominoid Paleobiogeography and the Geographic Origins of the Homininae
… and paleogeographic patterns in the Eurasian Miocene; a time period and geographic expanse rich in evidence of lineage origins and dispersals of numerous mammalian lineages, including apes. Traditionally, the geographic origin of the African ape and human lineage is considered to have occurred …
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Orbital Forcing of Late Miocene-Pleistocene Environmental Change in the Zhada Basin, SW Tibetan Plateau
… of Indian Summer Monsoon precipitation from late Miocene–early Pleistocene (~9.0-2.2 Ma) fluvio-lacustrine sediments in the Zhada Basin, southwestern Tibetan Plateau. The Zhada Basin lies near the northern extent of modern ISM precipitation where moisture-bearing ISM air masses mix with dry …
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BIOSTRATIGRAPHIC AND PALEOCEANOGRAPHIC RECONSTRUCTION OF THE LATE MIOCENE IN BAJA CALIFORNIA AND TRES MARIAS ISLANDS, MEXICO
A reconnaissance of sediments containing radiolarians was performed for localities along Baja California and Tres Marias Islands. Only seven land-base sections (El Cien, Tortugas, Arroyo Tiburon, Cabo San Lucas-La Paz, San Felipe, Arroyo Hondo and Maria Cleofas) together with Experimental Mohole …
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LATE MIOCENE AND PLIOCENE PALEOCEANOGRAPHY OF THE LOW LATITUDE NORTHERN HEMISPHERE AND ITS IMPLICATIONS FOR FUTURE CLIMATE CHANGE
The late Neogene represents an exceptionally dynamic period in Earth history during which the Northern Hemisphere has transitioned from a warmer, more equable climate to a cooler, more transient state characterized by waxing and waning continental ice sheets. While geographical distal, the tropical …
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A New Species of Teleoceras from the Late Miocene Gray Fossil Site, with Comparisons to Other North American Hemphillian Species
… of a browsing <em>Teleoceras</em> and, as a late Hemphillian locality, represents one of the youngest populations. Linear measurements of post-cranial elements indicate proportional differences between <em>Teleoceras</em> from the Gray Fossil Site and those from other Hemphillian localities. …
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Rapid Middle to Late Miocene Slip Along the Zanskar Normal Fault, Greater Himalayan Range, NW, India: Constraints from Low-Temperature Thermochronometry
… to the ZF, provide constraints on the middle Miocene to present exhumation history of the footwall. The overlap of these elevation invariant mean ZHe, AFT, and AHe thermochronometric ages, indicate rapid cooling between ~14-10 Ma. Inverse modeling of ZHe, AHe, and AFT thermochronometric data …
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New Zealand late miocene biostratigraphy and biochronology: Studies of planktic foraminifers and bolboforms at oceanic sites 593 and 1123, and selected onland sections
… New Zealand, this study documents for the late Miocene interval (about 11.6 to 5.2 million years ago) the nature and abundance of planktic foraminifers in these uncomplicated and virtually uninterrupted oceanic sequences. The discovery and documentation of bolboforms at both sites - an …
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Influence of climate and the expansion of C4 grasses on sequence-scale cyclicity and landscape development during the late Miocene to Pleistocene of West Texas.
… sedimentary and soil forming processes. The late Miocene to Pleistocene Fort Hancock and Camp Rice Formations from two adjacent isolated basins, southeast Hueco Bolson and northwest Eagle Flat Draw, were analyzed to determine whether changing climate and concomitant C₄ grass expansion …
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The Dynamics of the Late Neogene Antarctic Ice Sheets in the Central Ross Sea using a Multianalytical Approach
… sheet history in the central Ross Sea since the late Miocene, the provenance of glacial till from IODP expedition 374 site U1522 was assessed using a suite of three analyses. A total of 3,869 zircons, between 250-63 microns in size, from sixteen different cores were measured for U-Pb isotopes via …
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The Occurrence of an Abdominal Fauna in an Articulated Tapir (<em>Tapirus polkensis</em>) Recovered from the Miocene Gray Fossil Site Northeast Tennessee.
… recovered from the abdominal area of an articulated tapir from the Late Miocene (4.5-7 million bp) Gray Fossil Site, revealed a rich palyno-fauna comprised of about 94% egg/oocyst-like structures and 6% pollen and other palynomorphs. In addition, a tight grouping of six hickory nuts …
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Sequence Stratigraphy and Depositional Controls on Oligocene-Miocene Caribbean Carbonate-Dominated Systems, Puerto Rico and the Dominican Republic
… mean ages for selected Oligocene-Miocene carbonate and siliciclastic units in Puerto Rico and the Dominican Republic. Results indicate ages of middle-late Oligocene to late Miocene (ca. 29.78–5.88 Ma) and show some significant modifications to previous chronostratigraphic studies. …
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The orogenic evolution of the Central Kyrgyz Tien Shan
… of tectonic forces associated with distant plate collisions. In general, each mountain belt has a distinctive morphology and orogenic evolution that is highly dependent on the unique distribution and geometries of inherited structures and other crustal weaknesses. In this thesis, I have …
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Submarine channelforms and fans in the Miocene Moki and Mount Messenger formations, Taranaki Basin, New Zealand
Taranaki Basin (New Zealand) contains a Late Cretaceous – Cenozoic sedimentary succession up to 9 kilometres thick. Neogene strata are volumetrically a significant part of the basin fill. During the late-Middle Miocene a new sediment source, arising from the onset of uplift and erosion of the …
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Structural Controls of the San Emidio Geothermal System, Northwestern Nevada
… The San Emidio area is dominated by middle to late Miocene Pyramid sequence volcanic rocks and late Miocene to recent sedimentary rocks, all overlying Mesozoic metasedimentary rocks. Currently, a small geothermal power plant produces 3.6 MWe from a 152°C reservoir at 520 m depth at the south …
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Neogene paleomagnetism and geodynamics of the Hikurangi margin, East Coast, New Zealand
… of Neogene deformation in the New Zealand plate boundary region, and potentially offer fundamental insights into the rheology of continental crust. Extensive paleomagnetic sampling along the Hikurangi margin, on the East Coast of the North Island, has provided new insights into the patterns, …
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REVISED STRATIGRAPHIC AND TECTONIC EVOLUTION OF THE SAN FRANCISCO RIDGE; AN EMERGING PUSH-UP STRUCTURE IN THE NORTHEAST DOMINICAN REPUBLIC
"The San Francisco Ridge is bounded by left-lateral strike-slip faults associated with the Septentrional Fault System. In this regard, the Septentrional Fault represents a major fracture in the northeast of the Hispaniola Island and separates an uplifted oceanic crust represented by the Cordillera …
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Regional Deformation and Dynamic Processes of the Southern Puna Plateau, Central Andes
The southern Puna Plateau of the central Andes offers an excellent opportunity to (1) advance our understanding in orogenic models for non-collisional mountain belts, (2) test Earth’s upper-crustal responses to lower lithospheric processes, and (3) explore uses of low-temperature thermochronology …
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Eocene to Miocene geology of southwest Viti Levu, Fiji
… unconformity by the Upper Oligocene to Middle Miocene Wainimala Group which includes volcaniclastic turbidites, hemipelagic carbonates and vitric tuffs deposited in the Sigatoka sedimentary basin, and further south volcaniclastic rudites, intrusive/extrusive dacites and andesites, and minor …
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