Showing papers in "Palaeogeography, Palaeoclimatology, Palaeoecology in 1984"

TL;DR: In this paper, the global distribution of climatically significant criteria is surveyed for six successive time intervals: Hettangian-Toarcian, Aalenian-Callovian, Oxfordian-Tithonian, Berriasian-Barremian and Turonian-Maastrichtian.

TL;DR: In the Purbeck Formation of Dorset, a paradoxical association of evaporites and fossil forest vegetation is found, representing well-developed gymnosperm forests which grew on the borders of the shallow, hypersaline Purbeck lagoon which covered southern England during the late Jurassic as mentioned in this paper.

TL;DR: In this article, extensive overturn of deep toxic or biologically unconditioned water, at the beginning of climatic change, is suggested as a possible contributing factor to mass extinction events in the oceans.

TL;DR: In this article, the history of salinity and water-level changes in Didwana Lake, Thar Desert, India, has been reconstructed by using clastic sediment texture, mineralogy of both evaporites formed at the surface and precipitates formed below the lake floor, and relative chemical activities of the major dissolved components of the chemical precipitates.

TL;DR: A correlation diagram relates the numbered oxygen isotope stages of Shackleton and Opdyke's ODE curve for core V28-239, as extended by Gardner, to Nukumaruan, Castlecliffian and younger sedimentary cycles in Hawke's Bay, southern Wairarapa, and Wanganui districts as mentioned in this paper.

TL;DR: In this paper, a lower tilt to the Earth's axis is invoked to provide greater warmth and light in polar regions to account for these fossil records. But the existence of these occurrences seem explicable by the nature of the thermal environments in polar areas and by the physiological responses of plants and animals allied to those that lived there.

TL;DR: In this article, live specimens of benthic foraminifera have been analyzed from surface sediment samples collected from 108 to 1134 m depth in the Southern California Borderland, and the species analyzed break down into four groups which reflect the influence of mineralogy (aragonite vs. calcite), biological fractionation, and microhabitat effects on isotopic composition.

TL;DR: In this paper, the authors investigated the Plio-Pleistocene sediments of Bed I and Lower Bed II of Olduvai and provided an analysis using bovid tribes as habitat indicators.

TL;DR: Using finite rotations of the Pacific/Australian plate pair, a sequence of reconstructions of the relative positions of the plates is presented in this paper, which involves essentially the same structural elements as today but with large clockwise changes in their trend with time.

TL;DR: In this article, the authors used associations of different microfacies to define facies, which form reasonably well-defined sequences, which they infer, from analogies with recent and ancient carbonate environments, to have been deposited in a shelf environment characterized by small-scale topographic differentiation into shoal, slope and basinal environments.

TL;DR: In this article, a series of deep-sea box cores were collected over a broad latitudinal range (35°N to 30°S) and bathymetric range (1.4 to 5.7 km) in the central Atlantic Ocean.

TL;DR: A series of maps depicting changes in inferred boundaries of predominant airmasses during the late Quaternary are based upon paleoclimatic interpretation of paleovegetation maps for eastern North America, and CLIMAP maps of winter sea-surface temperatures for the western North Atlantic Ocean as discussed by the authors.

TL;DR: A large number of tests of three species of planktonic foraminifera, Globigerinoides sacculifer, Orbulina universa, and Pulleniatina obliquiloculata, were analyzed for stable oxygen and carbon isotopes in a western equatorial Pacific box core.

TL;DR: A prominent clastic wedge of latest Permian to early Triassic age (Katberg Sandstone) prograded northwestwards into the main Karoo Basin from a southerly source area as a sedimentary response to renewed tectonism associated with the Cape Fold Belt as discussed by the authors.

TL;DR: Paleontologic and paleomagnetic investigations were conducted on several hundred Pliocene and Pleistocene marine samples from five regions of the Atlantic Coastal Plain: (1) the Delmarva Peninsula, (2) eastern Virginia, (3) central and northern North Carolina, (4) southern North Carolina and northeastern South Carolina, and (5) the Charleston area, South Carolina.

TL;DR: In this paper, four types of dinosaur eggshell are distinguished among samples of fossil eggshell from Late Cretaceous deposits of southern France, based on shell microstructure, porosity, and shell thickness.

TL;DR: In this article, an adaptive structural theory is explored to test morphologic changes that reflect faunal submergence in thermospheric oceans such as existed in the Atlantic before about 40 m.y.p.

TL;DR: In this paper, a provisional synthesis of the bovid biogeographical history is provided, supported by the study of Miocene bovids, mainly from the Indian Subcontinent, the Arabian Peninsula and Africa.

TL;DR: The Upper Jurassic of Milne Land, Greenland, is a transgressive-regressive sequence ranging from offshore shallow sandbar complexes in the Late Oxfordian to outer shelf muds in the Kimmeridgian and Early to Middle Volgian as discussed by the authors.

TL;DR: In this paper, an analysis of the microfaunal distribution, bio-facies and sedimentary and tectonic history is made for reconstruction of the palaeoenvironmental conditions and palaeogeography of the Bengal Basin relating to the post-Eocene regressive phase of evolution.

TL;DR: A cedar swamp on Manitoulin Island, Ontario, Canada was chosen for a paleoecological study of pollen, macrofossils and Cladocera as discussed by the authors.

TL;DR: In this article, the authors investigated the differences between the arenaceous faunas from diatomaceous sediments west of the Kerguelen Plateau and glacial marine sediments from the slope of the Antarctic continent and found that the main differences are primarily induced by the overall situation of an oceanic area rather than by depth or oceanographic factors like temperature or salinity.

TL;DR: In this paper, a comparison of the palaeogeographical distributions of brachiopods and ammonites in western Algeria and its constituent basins give evidence of the control played by physiological differentiation.

TL;DR: In this paper, a description and interpretation of marine, fragment-bearing arenaceous shales occuring near the Ordovician/Silurian boundary in northeast Spain is given.

TL;DR: In this paper, the authors reconstructed the biotopes of the fossil Sus strozzii and the modern Sus scrofa using Fleming's ecological diagrams in the Andrews et al. version, slightly modified by us.

TL;DR: A survey of the records of the remains of Miocene land mammals from nearshore marine deposits on the Atlantic and Gulf Coastal Plains of the United States reveals a number of occurrences where the relationship between mammalian and invertebrate biochronologies can be directly compared.

TL;DR: In this article, a reassessment of the timing and pattern of changing sea levels and climates in the eastern Gulf Coastal Plain of the U.S.A., based on calcareous nannoplankton, is presented.