نتایج جستجو برای: campanian

تعداد نتایج: 532  

Journal: :Geodiversitas 2021

The sedimentary strata were sampled in the lesser Himalayas to probe paleoenvironmental changes across Cretaceous-Paleogene (K-Pg) boundary eastern Tethys. study provides an integrated lithologic and bio-sequence stratigraphic analysis, leading paleoecology interpretations. planktic foraminiferal limestone of late Cretaceous is overlain by lateritic sandstones sandy limestones, latter being Pal...

2018
Caleb M. Brown

The horned Ceratopsidae represent one of the last radiations of dinosaurs, and despite a decade of intense work greatly adding to our understanding of this diversification, their early evolution is still poorly known. Here, two postorbital horncores from the upper Foremost Formation (Campanian) of Alberta are described, and at ∼78.5 Ma represent some of the geologically oldest ceratopsid materi...

2016
Brian A. Atkinson Ruth A. Stockey Gar W. Rothwell

BACKGROUND Cornaceae consists of 58 species, all within the genus Cornus. The Cenozoic record of Cornus is extensive and well documented. Molecular divergence-time studies suggest that crown-group Cornus may have originated by the Late Cretaceous. However, there has been no formal report of Cornus from Cretaceous deposits. Here, we characterize a permineralized fossil fruit assignable to Cornus...

2016
Gordon Adams Christopher R. Fielding

A sedimentological, stratigraphical and palynological study was conducted on the upper Cretaceous (Campanian) Mesaverde Group over 27.5 km of a north-south-orientated outcrop belt in the northern Bighorn Basin, Wyoming. During the Campanian, the study area lay in the western part of the Cretaceous Western Interior Seaway. The study aims to provide a stratigraphic and paleoenvironmental analysis...

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