Results 131 to 140 of about 3,019,172 (413)

Challenges in dating blanket peat and implications for understanding its initiation in Ireland

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT Blanket peat is widespread in maritime extra‐tropical environments. Prehistoric land‐use activity was traditionally invoked as the stimulus of blanket peat initiation in the British Isles, but recently, climate has been viewed as the driver of peat formation.
Helen Essell   +2 more
wiley   +1 more source

Sequence Stratigraphy and Microfacies of the Middle Ordovician Yijianfang Formation in the Tarim Basin, NW China [PDF]

open access: yesLithosphere
It is of great significance for further exploration in deep-burial carbonates to clarify the distribution of sedimentary microfacies within the high-precision sequence framework and to analyze how the sequence stratigraphy and lithologic types control ...
Yu Gu, Jun Wu, Tailiang Fan
doaj   +1 more source

The origin of fine scale acoustic stratigraphy in deep-sea carbonates [PDF]

open access: yes, 1979
In this paper we investigate the origin and geologic significance of the closely spaced high-frequency subbottom acoustic reflectors characteristic of pelagic carbonates.
Mayer, Larry A.
core   +2 more sources

On building and fitting a spatio-temporal change-point model for settlement and growth at Bourewa, Fiji Islands [PDF]

open access: yesarXiv, 2010
The Bourewa beach site on the Rove Peninsula of Viti Levu is the earliest known human settlement in the Fiji Islands. How did the settlement at Bourewa develop in space and time? We have radiocarbon dates on sixty specimens, found in association with evidence for human presence, taken from pits across the site.
arxiv  

Late Quaternary population expansion in gray brocket deer [Subulo gouazoubira (G. Fisher, 1814), Cervidae, Mammalia] in Brazil

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT There is little information about the changes in the abundance of mammalian species in South America during the late Quaternary, which is a key parameter to understanding past ecological and evolutionary dynamics. Here, we describe a conspicuous increase in the abundance of the gray brocket deer (Subulo gouazoubira G.
Alex Hubbe   +21 more
wiley   +1 more source

Application of palynological data to the chronology of the Palaeogene lava fields of the British Province: implications for magmatic stratigraphy [PDF]

open access: yes, 1997
New high-precision ages, determined from palynomorph assemblages within intercalated sedimentary deposits, are presented for the Palaeogene lava fields (Skye, Mull and Antrim) of the British Province. These data reveal very rapid averaged eruption rates (
Bell, B.R., Jolley, D.W.
core   +1 more source

Cryptotephra from a ~120 ka Tondano eruption in a sediment core from Lake Towuti (Indonesia)

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT Southeast Asia is one of the most volcanically active regions in the world, yet their long‐term eruptive history has been comparatively little studied. In particular, little work has explored the potential of sedimentary archives to record distal cryptotephra, which may help in identifying some of the region's larger Quaternary eruptions. Here,
Jinheum Park   +8 more
wiley   +1 more source

Palynological and Sequence Stratigraphy Framework of Campanian-Maastrichtian Deposit of Anambra Basin, Awgu Section, Southeast Nigeria

open access: yesJournal of Applied Sciences and Environmental Management
A combination of palynological and palynofacies data are used as lithological evidence to describe sequence stratigraphic framework. Hence, the objective of this paper as to deploy the palynological and sequence stratigraphy framework of Campanian ...
I. S. Didei, N. E. Ajaegwu
doaj  

Study on Geochemical Characteristics of Rare Earth Elements of Xinhua Phosphate Rocks in the Upper Yangtze, South China by ICP-MS/AES and Its Sedimentology Implications

open access: yesYankuang ceshi, 2015
Xinhua phosphorus is a sedimentary phosphate deposit in China with strong REEs enrichment. In this study, Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Inductively Coupled Plasma-Atomic Emission Spectrometer (ICP-AES) as well as rock-mineral ...
DUAN Kai-bo   +7 more
doaj   +1 more source

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