Results 81 to 90 of about 1,497,171 (212)
On the Upper Ordovician unconformity in the Pyrenees : new evidence from the La Cerdanya area
, 2021 In recent years, contradictory reports about whether or not an unconformity exists at the base of the Upper Ordovician succession of the Pyrenees have been made.
Fernández, Óscar +1 more
core
Petroleum Exploration and Development, 2017 Based on the carbon isotopic compositions of Cambrian-Ordovician source rocks Kerogen Samples and Paleozoic crude oil in the platform region of Tarim Basin, the origin and source of Paleozoic crude oil were investigated.
Xinjian ZHU +6 more
doaj +1 more source
A 3D Vp and Vs Velocity Model for the Midland Basin, Texas
Earth and Space Science, Volume 13, Issue 11, November 2026.Abstract Three‐dimensional velocity models are essential for characterizing subsurface structure in sedimentary basins and integrating heterogeneous geophysical data sets into a consistent geological framework. In this study, we present a high‐resolution 3D compressional‐wave velocity (Vp ${V}_{p}$) and shear‐wave velocity (Vs ${V}_{s}$) model for the ...
E. Parastatidis +2 more
wiley +1 more source
The appearance of Rosenella (stromatoporoid sponge) in Baltica: new species from the Pirgu Stage (Katian, Upper Ordovician) of Estonia [PDF]
Estonian Journal of Earth SciencesThe Katian Age, part of the Late Ordovician Epoch, was a period of significant stromatoporoid diversification. However, their fossil record is often less continuous, hindering our understanding of their diversity and diversification.
Juwan Jeon, Ursula Toom
doaj +1 more source
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 11, November 2026.Abstract Whole‐rock geochemical data from two drill cores obtained through the ICDP (International Continental Scientific Drilling Program) funded Drilling the Ivrea‐Verbano Zone (IVZ) (DIVE) project: 5071_1_B (Ornavasso) and 5071_1_A (Megolo), provide new insights into the composition of the lower continental crust (LCC) in the IVZ. Borehole 5071_1_B (
Alexia Secrétan +9 more
wiley +1 more source
Upper Ordovician Conodonts of Alabama
, 1973 Electronic ThesisUpper and upper Middle Ordovician rocks at six localities in northern Alabama yielded 1,973 conodonts referrable to 15 biological species distributed among 10 biological genera and 17 form-species distributed among 9 form-genera ...
Raymond, Dorothy Echols
core +1 more source
New Results From the Pre‐Pottery Neolithic Site of Al Uyaynah, Tabuk, in Northwestern Saudi Arabia
Arabian Archaeology and Epigraphy, Volume 37, Issue 1, Page 182-206, November 2026.ABSTRACT Al Uyaynah is a low sandstone mound on an alluvial plain, long known for its extensive surface remains of stone‐built circular and rectangular structures. Following test excavations in 2012, more detailed excavation was undertaken in 2016 within one of the largest rectangular stone structures.
Khalid Alasmari +6 more
wiley +1 more source
U-Pb zircon age of Ordovician magmatism in the Albera Massif (Eastern Pyrenees)
Geologica Acta, 2011 New geochronological data from the Albera Massif confirm the presence of an Early – Mid Ordovician igneous event (472 - 465Ma) recorded in the pre-Variscan rocks of the Pyrenees.
M. LIESA TORRE-MARÍN +5 more
doaj
Late Ordovician cephalopods from Morocco and their implications
Swiss Journal of PalaeontologyThe present paper describes the latest cephalopod fauna from the Upper Ordovician in the Anti-Atlas region, Morocco. Two species are reported herein belonging to two genera including one new species, Tafadnatoceras elfechtense sp. nov.
Xiang Fang +12 more
doaj +1 more source
Upper Ordovician conodonts in the Valbertad section
, 2017 .
BAGNOLI GABRIELLA +3 more
openaire +4 more sources