Results 51 to 60 of about 8,428 (209)
Rivista Italiana di Paleontologia e Stratigrafia, 2003 Calcareous foraminifers provide a time-stratigraphic framework to chronicle the development of the Tengiz carbonate platform that thrived from the latest Devonian (late Famennian) into the Middle Pennsylvanian (late Bashkirian). Correlative zones, based
PAUL L. BRENCKLE, NATALIA V. MILKINA
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Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.Abstract This study integrates new zircon U–Pb ages, zircon εHf(t)–δ18O isotopic data, and whole‐rock geochemistry to refine the temporal and spatial framework of magmatism in the southern Northern Andes (SNA) from ∼65 to 6 Ma. The San Lucas, Catamayo, Portachuela, and Gonzanamá batholiths and magmatic suites, along with Late Miocene plutons, display ...
J. Iglesias +14 more
wiley +1 more source
AMERICAN QUARTER HORSES’ BEHAVIORAL FORMS
Studia Universitatis Moldaviae: Stiinte reale si ale naturii, 2016 The review of basic literary sources is made out of behavior of horse. On the basis of the field researches (visual supervisions) after three different aged groups of mares it is built ethograms. An ethogram of behavioral forms among mares was developed.
Iryna Olexandrivna Suprun, Bert STANIER
doaj
Rivista Italiana di Paleontologia e Stratigrafia, 2019 A carapace of a new horseshoe crab (Arthropoda: Chelicerata: Xiphosura) is described from the Upper Carboniferous (Kasimovian) Meledis Formation of the Carnic Alps, Friuli, Italy. It is named as Stilpnocephalus pontebbanus n. gen. & n.
PAUL A. SELDEN +2 more
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Evidence for coal forest refugia in the seasonally dry Pennsylvanian tropical lowlands of the Illinois Basin, USA [PDF]
PeerJ, 2014 The Moscovian plant macroflora at Cottage Grove southeastern Illinois, USA, is a key example of Pennsylvanian (323–299 Million years ago) dryland vegetation.
Cindy V. Looy +3 more
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Tectonics, Volume 45, Issue 8, August 2026.Abstract The timing and nature of early deformation in the Rio Grande Rift remains poorly constrained. We present evidence for the earliest structural signature of rift extension in the Sangre de Cristo Range, southern Colorado, based on new geologic mapping, structural analysis, rock magnetic data, and thermochronology. These analyses focus on the ∼30.
Samantha Malavarca +7 more
wiley +1 more source
Divisions of the Pennsylvanian System in Kansas [PDF]
, 1949 This report summarizes studies in the northern midcontinent region bearing on classification of rocks belonging to the Pennsylvanian System in Kansas. It does not review historical features in the development of classification, treated in 1936 (Kansas ...
Moore, Raymond C.
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Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.Abstract The tectonic evolution of the northern margin of the North China Craton (NCC) remains controversial. In this study, we obtained zircon U–Pb ages, geochemical data, and Sr–Nd isotopic data for volcanic rocks, and detrital zircon ages for sedimentary rocks from the Yufutun, Tongqigou, and Benxi formations in central‐southern Jilin Province, NE ...
Yunfei Chang +6 more
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Tectonics, Volume 45, Issue 8, August 2026.Abstract The Sangre de Cristo Range in southern Colorado records a complex tectonic history that includes Late Cretaceous–Eocene Laramide contraction and Oligocene–Quaternary Rio Grande rift extension. We present new thermochronologic data (40Ar/39Ar, fission‐track, (U‐Th)/He) and thermal history models that provide insight into this polyphase history ...
John Singleton +10 more
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Iowa Pennsylvanian Goniatites [PDF]
, 1949 In view of the exceptional stratigraphic value of Late Carboniferous ammonoids, it seems worthwhile to bring together the available information in regard to the known occurrences of these fossils in our State.
Miller, A. K.
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