992 resultados para Adventure and Beagle Expedition (1826-1830)


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La Argelia francesa (1830-1962) constituyó un poderoso polo de atracción para los habitantes de las islas Baleares y del sudeste peninsular. En este artículo se analizan las relaciones migratorias y comerciales entre el archipiélago balear y su por entonces próspero vecino del sur. Además, también se estudian los diferentes exilios que vincularon las dos riberas del Mediterráneo. Para realizar este artículo se han combinado tanto fuentes primarias como la bibliografía existente.

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A handwritten letter with suggested subjects from John White Webster, a lecturer of chemistry, mineralogy, and geology at the Harvard Medical College from 1824 until 1827, when he was appointed the Erving Professor of Chemistry (1827-1850).

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Four documents with suggested questions in the hand of Andrews Norton, Dexter Lecturer on Biblical Literature from 1813 to 1830. One of the documents is signed by Norton and addressed to President Kirkland.

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One letter regarding the arrival of James Cooley as American chargé d’affairs in Lima.

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Three letters regarding Buenos Aires news and politics, including his hope that General Juan Lavalle would end up "on a Gibbet." Also includes Ponsonby’s opinion of Manuel Dorrego and his execution.

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Four letters thanking Tudor for his diplomatic reports and various suggestions, and reporting that Tudor’s views on surveys and communications with the Navy’s Pacific Squadron "entirely concur with those of the Executive."

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Expedition 302 of the Integrated Ocean Drilling Program (IODP), also known as the Arctic Coring Expedition (ACEX), successfully penetrated a sequence of Cenozoic sediments draping the crest of the Lomonosov Ridge in the central Arctic Ocean. The cumulative sedimentary record spans the last 57 m.y. and was recovered from three sites located within 15 km of each other. Merging the recovered cores onto a common depth scale that accurately reflects their stratigraphic placement below the seafloor is a fundamental step toward interpreting this unique sedimentary record. However, the lack of overlapping recovery in adjacent holes and intervals of high core disturbance complicated traditional methods of stratigraphic correlation. Here we present a revised composite depth scale for the ACEX sediments, generated in part by performing a regional stratigraphic correlation with sediments recovered from previous expeditions to the Lomonosov Ridge. The revised depth scale also reassesses the offsets for cores in the upper 55 meters below seafloor, where no overlapping recovery was acquired, and proposes modifications to these depths.

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Oligocene to Quaternary sediments were recovered from the Antarctic continental margin in the eastern Weddell Sea during ODP Leg 113 and Polarstern expedition ANT-VI. Clay mineral composition and grain size distribution patterns are useful for distinguishing sediments that have been transported by ocean currents from those that were ice-rafted. This, in turn, has assisted in providing insights about the changing late Paleogene to Neogene sedimentary environment as the cryosphere developed in Antarctica. During the middle Oligocene, increasing glacial conditions on the continent are indicated by the presence of glauconite sands, that are interpreted to have formed on the shelf and then transported down the continental slope by advancing glaciers or as a result of sea-level lowering. The dominance of illite and a relatively high content of chlorite suggest predominantly physical weathering conditions on the continent. The high content of biogenic opal from the late Miocene to the late Pliocene resulted from increased upwelling processes at the continental margin due to increased wind strength related to global cooling. Partial melting of the ice-sheet occurred during an early Pliocene climate optimum as is shown by an increasing supply of predominantly current-derived sediment with a low mean grain size and peak values of smectite. Primary productivity decreased at ~ 3 Ma due to the development of a permanent sea-ice cover close to the continent. Late Pleistocene sediments are characterized by planktonic foraminifers and biogenic opal, concentrated in distinct horizons reflecting climatic cycles. Isotopic analysis of AT. pachyderma produced a stratigraphy which resulted in a calculated sedimentation rate of 1 cm/k.y. during the Pleistocene. Primary productivity was highest during the last three interglacial maxima and decreased during glacial episodes as a result of increasing sea-ice coverage.

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Includes bibliographical references (p. 286-287).

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Vol. 3 has subtitle: Including tours, descriptions, towns, histories and antiquities, surveys, ancient and present state, gardening, etc.

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Colophon: London:/Printed by S. and R. Bentley, Dorset Street.

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Mode of access: Internet.

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Vol. [9-10] have imprint: Prag, In der Schönfeld'schen kaiserl. konigl. Hofbuchdruckerey.