Results 181 to 190 of about 28,382 (212)
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AAPG Bulletin, 1988
Abundant evidence from the rock record indicates that volcanism, active faulting, and sedimentary-basin development were widespread and nearly synchronous in west-central California during the late Oligocene and early Miocene. Volcanic activity occurred about 24-22 Ma at more than 20 eruptive centers in a northwest-trending belt, extending from Point ...
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Abundant evidence from the rock record indicates that volcanism, active faulting, and sedimentary-basin development were widespread and nearly synchronous in west-central California during the late Oligocene and early Miocene. Volcanic activity occurred about 24-22 Ma at more than 20 eruptive centers in a northwest-trending belt, extending from Point ...
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Tectonophysics, 1996
Abstract We present a mineralogical and isotopic study of Early Miocene turbidites from the Bengal Fan, which are the oldest sediments recovered during ODP Leg 116. Clay fractions are dominated by illite and chlorite and have low δ18O (11–16‰). The clays are dominantly derived from a metamorphic precursor by physical erosion, and have undergone only ...
Galy, Albert +2 more
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Abstract We present a mineralogical and isotopic study of Early Miocene turbidites from the Bengal Fan, which are the oldest sediments recovered during ODP Leg 116. Clay fractions are dominated by illite and chlorite and have low δ18O (11–16‰). The clays are dominantly derived from a metamorphic precursor by physical erosion, and have undergone only ...
Galy, Albert +2 more
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Vegetation history of the central Tibetan region during the late Oligocene–Early Miocene
Journal of Systematics and EvolutionAbstractUnderstanding the Cenozoic vegetation history of what is now the Qinghai–Tibetan Plateau is crucial for elucidating the co‐evolutionary dynamics between plateau development, its environment, and the organisms it hosts. In this study, we conduct a comprehensive analysis of phytoliths within the late Oligocene–Early Miocene lacustrine sedimentary
Xin‐Wen Zhang +7 more
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Late Oligocene–early Miocene glacial record of the Ross Sea, Antarctica: Evidence from DSDP Site 270
Geology, 1983Foraminifera from Deep Sea Drilling Project Site 270, Ross Sea, Antarctica, are used to trace an early phase of glaciation during the late Oligocene–early Miocene. The central Ross Sea underwent significant bathymetric and oceanographic evolution with the inception of glaciomarine sedimentation, resulting in the sequential development of four ...
R. Mark Leckie, Peter-Noel Webb
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SEPM Journal of Sedimentary Research, 1981
ABSTRACT Sediments deposited in and around a closed, shallow, perennial lake (Lake Passamari) constitute the late Oligocene-early Miocene Passamari Member of the Renova Formation. Three sedimentary facies are recognized: 1) lacustrine-nearshore and open lacustrine environments; 2) marginal lacustrine-deltaic and fluvial-lacustrine environments; and 3 ...
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ABSTRACT Sediments deposited in and around a closed, shallow, perennial lake (Lake Passamari) constitute the late Oligocene-early Miocene Passamari Member of the Renova Formation. Three sedimentary facies are recognized: 1) lacustrine-nearshore and open lacustrine environments; 2) marginal lacustrine-deltaic and fluvial-lacustrine environments; and 3 ...
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Journal of Vertebrate Paleontology, 2006
(2006). Discovery of Deseadan fossils in the upper Moquegua Formation (late Oligocene—?early Miocene) of southern Peru. Journal of Vertebrate Paleontology: Vol. 26, No. 1, pp. 205-208.
Bruce J. Shockey +8 more
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(2006). Discovery of Deseadan fossils in the upper Moquegua Formation (late Oligocene—?early Miocene) of southern Peru. Journal of Vertebrate Paleontology: Vol. 26, No. 1, pp. 205-208.
Bruce J. Shockey +8 more
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Tectonophysics, 1982
Abstract Eight lithofacies representing a westward trending, deep sea fan, dominantly deposited from mass flow mechanisms, are recognised in geologic sections in the lower part of the Sarava Formation, of Late Oligocene/Early Miocene age, on Maewo Island, Vanuatu, New Hebrides.
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Abstract Eight lithofacies representing a westward trending, deep sea fan, dominantly deposited from mass flow mechanisms, are recognised in geologic sections in the lower part of the Sarava Formation, of Late Oligocene/Early Miocene age, on Maewo Island, Vanuatu, New Hebrides.
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Health insurance status and cancer stage at diagnosis and survival in the United States
Ca-A Cancer Journal for Clinicians, 2022Jingxuan Zhao +2 more
exaly
1994
The Old Church Formation contains the only presently known exposed Oligocene sediments in the North American mid-Atlantic Coastal Plain. Some ambiguity concerning the exact age of the Old Church Formation exists because it may include both Oligocene and Miocene sediments. Two outcrops and four cores containing the Old Church Formation were examined for
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The Old Church Formation contains the only presently known exposed Oligocene sediments in the North American mid-Atlantic Coastal Plain. Some ambiguity concerning the exact age of the Old Church Formation exists because it may include both Oligocene and Miocene sediments. Two outcrops and four cores containing the Old Church Formation were examined for
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