Results 131 to 140 of about 2,013 (181)

Using Mg isotopes to constrain the formation temperature of dolomite. [PDF]

Sci Rep
Li X, Zhu G, Ai Y, Zhang Z, Chen W, Li T, Zhang Y, Duan P.   +7 more
europepmc   +1 more source

Phosphatic stromatoporoid sponges formed reefs ~480 Mya. [PDF]

Proc Natl Acad Sci U S A
Jeon J, Simonet Roda M, Chen ZY, Luo C, Kershaw S, Kim D, Ma JY, Lee JH, Zhang YD.   +8 more
europepmc   +1 more source

The barite record of the past seawater oxygen isotope composition. [PDF]

Nat Commun
Han T, Bao H, Peng Y, Lu Z, Song Y.
europepmc   +1 more source

Study on the Development, Evolution, and Main Controlling Factors of Gypsum Moldic Vugs in Ma5₄ ¹, Central Ordos Basin. [PDF]

ACS Omega
He J, Tang C, Zhao G, Du J, Mei X, Zhang Z, Zhao Z, Yao J.   +7 more
europepmc   +1 more source

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Late Ordovician extinctions of bryozoans

Lethaia, 1992
An analysis of the final stratigraphic appearances of byrozoan species and genera, compiled in a world-wide bryozoan data base, revealed three discrete Late Ordovician extinctions. A Late Carddoc (Onnian) extinction was most pronounced on the plates of Baltica and Siberia.
Michael E. Tuckey, Robert L. Anstey
openaire   +1 more source

Microbialite resurgence after the Late Ordovician extinction

Nature, 2004
Microbialites, including biogenic stromatolites, thrombolites and dendrolites, were formed by various microbial mats that trapped and bound sediments or formed the locus of mineral precipitation. Microbialites were common and diverse during the Proterozoic, but declined in abundance and morphological diversity when multicellular life diversified during
Peter M, Sheehan, Mark T, Harris
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Late Ordovician Jordanian Tunnel Valleys

71st EAGE Conference and Exhibition - Workshops and Fieldtrips, 2009
The Hirnantian (latest Ordovician, ~ 444 Ma) glacial advance on the Gondwana shelf succession is documented throughout the Arabian and North African regions with resulting tunnel valleys described for instance in Mauritania (Ghienne et Deynoux 1998) or Libya (Le Heron et al., 2004). Following the work of Abed et al. (1993), Powell et al.
G. Douillet, J. -F. Ghienne
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Late Ordovician tunnel valleys in southern Jordan

Geological Society, London, Special Publications, 2012
Abstract The Upper Ordovician glacial record of southern Jordan (Ammar Fm.) essentially consists of palaeovalley infills and of a subordinate time-transgressive fluvial to shallow-marine succession overstepping both the palaeovalleys and interfluvial areas.
Douillet, G., Ghienne, Jean-François, Géraud, Yves, Abueladas, A., Diraison, Marc, Al-Zoubi, A.   +5 more
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Late Ordovician Tunnel Valleys

71st EAGE Conference and Exhibition - Workshops and Fieldtrips, 2009
Overdeepened incisions forming tunnel valleys are remarkable geomorphic elements, which provide valuable information on past subglacial hydrological regimes and may constitute attractive reservoir targets. Geometries and distribution of Quaternary tunnel valleys have been intensively illustrated based on geophysics, while the glacial record of pre ...
openaire   +1 more source