Showing papers in "Palaeogeography, Palaeoclimatology, Palaeoecology in 1972"

TL;DR: A careful survey of the dinosaur footprints and trackways (identified as Eubrontes, Anchisauripus and Grallator) at the Mt. Tom site north of Holyoke, Massachusetts, and plots of their orientations reveal that an improbable percentage (70%) of the tracks are oriented in a near-parallel course as discussed by the authors.

TL;DR: Growth rates of three marine bivalves -mytilus edulis, Serripes groenlandicum and Clinocardium ciliatum-are used to elucidate Late-Quaternary marine conditions in the Canadian Arctic and Subarctic as discussed by the authors.

TL;DR: In this paper, the geographic distribution of 31 species of Late Campanian to Early Maestrichtian planktonic foraminifers from Baja California to Alaska define four faunal provinces (Tethyan, Central, Intermediate, and Boreal).

TL;DR: Crustacean burrows are common in Recent sediments associated with fringing reefs around Mahe, Seychelles as discussed by the authors, and the distribution of morphotypes shows only general correspondence to recognised biofacies zones, and well-preserved burrows from Pleistocene limestones on Aldabra demonstrate that, while providing useful corroborative evidence, burrow are of limited value as primary zone indicators.

TL;DR: In this article, the authors examined 26 alluvial fans situated to the southeast of Tehran and found a direct relationship between the fan area and the drainage basin area and an inverse relationship between fan areas and the mean slope of the fan.

TL;DR: The London Clay flora is not thought to represent a true Tropical Rain Forest climate, but a climatic type not represented at the present day as mentioned in this paper, and it is suggested that the extra-tropical plants from the London Clay were truly contemporaneous with the tropical forms, and they grew further away from these bodies of water under less humid conditions, though not in higher altitudes.

TL;DR: In this article, the mean monthly composite patterns of surface weather anomalies and 700 mbar height anomalies are determined for snowy winters and cool summers in both Keewatin and Labrador-Ungava and also for different positions of the mean 700mbar trough over eastern Canada.

TL;DR: Lower Lias sediments from the Danish island of Bornholm exhibit many sedimentary indications of tidal influence during their deposition, such as a regressive tidal flat with supratidal salt-marsh (coals and rootlet-beds), tidal flat (flaser-and wavy-bedded clays and sands), tidal creeks, storm scours and sand sheets, large scale metaripples and subtidal sand bars as discussed by the authors.

TL;DR: Pleistocene climatic fluctuations as determined by means of oxygen isotope ratios from the pelagic sedimentary record of the Caribbean can be recognized also by changes included in the calcareous nannoplankton as mentioned in this paper.

TL;DR: In the Upper Cretaceous of southeastern France, the development of rudist formations occured between the Upper Albian and the Senonian as mentioned in this paper, and the diversity of biocoenoses is such that a detailed palaeoecological study is possible, of which the principal character is as follows: 1) Conditions of development.

TL;DR: Piston core P6603-49 from the eastern edge of the Blake Plateau reveals increasing sediment starvation and sorting, and increasing ocean surface temperatures, beginning 5.7 million years ago.

TL;DR: A detailed study of drill cores from the Ndola area shows erosional basal contacts, slump structures, fabric and correlatable pebble-size variations, indicative of a mode of deposition by mudflows as discussed by the authors.

TL;DR: In this paper, an autochthonous lower Miocene limstone is shown to be autochTHonous and a mechanism is proposed to explain the development of the Lower Miocene auto-fatus, which relates their origin partly to lateral facies changes in the LowerMiocene and partly to their subsequent mode of erosion by the emplacement of the Bobonaro olistostrome.

TL;DR: The Bembridge Marls accumulated during a short-lived brackish transgression and the rather longer regressive period which followed as mentioned in this paper, and the fossil assemblages have been placed in four faunal associations, which are thought to reflect the former existence of: ( 1) an estuary; ( 2 ) bracky lagoons; ( 3 ) coastal lakes, subject to occasional flooding by more saline waters; ( 4 ) flood plain lakes, sometimes incorporated into sluggish river systems.

TL;DR: In this paper, the authors used the Experimental Mohole to correlate Riedel's "warm" time-indices with selected "cold" time indices from the Antarctic and southern California.

TL;DR: The Planktonic biostratigraphy of the Lomita-Timms Point complex is less than 1 m.y. in age in contrast to glauconite K-A ages of about 3m.y.

TL;DR: In this article, the authors analyzed transported assemblages of Mactra corallina from Aberdeen beach and showed that the samples consist of two components, freshly-killed shells and exhumed dead shells.

TL;DR: Trial application of the concept of recurring groups and systems to interpretation of other Quaternary spore-pollen assemblages suggests that this method is useful and may lead to a more critical paleoecologic evaluation of palynologic data.

TL;DR: In this article, an unusual level of the "stromatolite series" is found in the Atar Group on the northern border of the syneclise of Taoudenni (Mauritania, western Sahara).

TL;DR: In this paper, Calcareous nannoplankton and planktonic Foraminifera were recovered from samples of the Tyee Formation, the “siltstone of Alsea” and the Nye Mudstone.

TL;DR: In this article, Brachiopod biotopes are recognized in the Early Jurassic rocks of Bulgaria and the geographical distribution of these is plotted for each of the stratigraphical zones determined earlier on the basis of brachiopods.

TL;DR: In this article, an oozy core sampled on the top of an abyssal hill in the Ligurian Sea, and characterized by a very regular sedimentary process, was studied by means of three paleoclimatological analyses founded on Foraminifera, oxygen isotopes 18O/16O and clay minerals.

TL;DR: An abundant and diverse chrysomonad-cyst flora is present in the Marca Shale Member of the Moreno Formation of California as mentioned in this paper, associated with the siliceous cysts are diatoms, silicoflagellates, radiolarians, and rarely Foraminifera.