Results 161 to 170 of about 3,163 (215)

Barremian tricolpate pollen from Portugal-New evidence for the age of eudicot-related angiosperms. [PDF]

Proc Natl Acad Sci U S A
Gravendyck J, Krencker FN, Riding JB, Coimbra R, Heimhofer U.   +4 more
europepmc   +1 more source

Transient oxygenation of the Mediterranean after the Zanclean megaflood. [PDF]

Proc Natl Acad Sci U S A
Amarathunga U, Brocks JJ, Meijer PT, Hope JM, Zachariasse WJ, Hennekam R, van der Hoeven I, Roehl U, Rule S, Troitzsch U, Haberle S, Sluijs A, Grant KM, Krijgsman W, Garcia-Castellanos D, Hogg AM, Reichart GJ, Roberts AP, Rohling EJ.   +18 more
europepmc   +1 more source

Ediacaran-Cambrian paleosols of Nevada and California. [PDF]

PLoS One
Retallack GJ.
europepmc   +1 more source

The problematic of soil contamination by industries in a protected area in Portugal. [PDF]

Environ Geochem Health
Michels F, Ribeiro J, Henriques MH.
europepmc   +1 more source

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Stratotype of Ordovician Whiterock Series

PALAIOS, 1991
Here the authors reaffirm and document fossil ranges at the stratotype section for the base of the Whiterock Series in Whiterock Canyon, northern Monitor Range, Nevada, and designate a reference section at Meiklejohn Peak, Bare Mountain quadrangle, Nevada.
Reuben James Ross, Raymond L. Ethington, Charles E. Mitchell   +2 more
openaire   +1 more source

International stage stratotypes

1996
All of the Upper Carboniferous stages in the so-called ‘Heerlen Classification’, from the Chokierian to the Bolsovian, have their base stratotypes in northern England (the Westphalian D base stratotype has yet to be selected, although sites in South Wales will probably be strong contenders).
C. J. Cleal, B. A. Thomas
openaire   +1 more source

Iridium Abundances Across the Ordovician-Silurian Stratotype

Science, 1986
Chemostratigraphic analyses in the Ordovician-Silurian boundary stratotype section, bracketing a major extinction event in the graptolitic shale section at Dob's Linn, Scotland, show persistently high iridium concentrations of 0.050 to 0.250 parts per billion. There is no iridium concentration spike in the boundary interval or elsewhere in
P, Wilde, W B, Berry, M S, Quinby-Hunt, C J, Orth, L R, Quintana, J S, Gilmore   +5 more
openaire   +2 more sources

Introduction to Part A Chronostratigraphic units: Historical stratotypes and global stratotypes

1995
Publisher Summary This chapter discusses historical and global stratotypes. In agreement with common usage, the word “stage” is used in this presentation; both for the actual rocks deposited during an interval of time, and for the interval of time itself (sometimes called “age”).
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Problems in chronostratigraphy: stages, series, unit and boundary stratotypes, global stratotype section and point and tarnished golden spikes

Earth-Science Reviews, 1999
Abstract Stratigraphy is a magnificent subject—magnificent in its breadth and scope, magnificent in its importance to so many lines of human endeavor. It is essentially that branch of geology which deals with the arrangement, the distribution, and the chronological succession of rock strata (and other associated rock bodies), with respect to any or
Marie-Pierre Aubry, William A Berggren, John A Van Couvering, Fritz Steininger   +3 more
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Stratotypes and an International Geochronologic Scale

1978
Abstract An international geochronologic scale is needed in order to provide a single universal standard of reference for dating rock strata, or events recorded in rock strata, anywhere in the world. There are many possible means of relating rock strata and the geologic events they record to the passage of ...
openaire   +1 more source