Results 41 to 50 of about 1,144 (173)

The effect of early diagenetic processes on the quantification of fossil micrometeorite abundance and flux in the geological record

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract Fossil micrometeorites (MMs) recovered from lithified sedimentary rocks, particularly iron‐rich (I‐type) cosmic spherules (CSs) provide valuable insights into past dust‐forming events. Their abundances, when combined with estimates of local sedimentation rates can be used to reconstruct the flux of extraterrestrial dust.
Isabelle S. Mattia   +2 more
wiley   +1 more source

STABLE CARBON AND OXYGEN ISOTOPES OF SOME CARBONATE-FLUORAPATITES FROM CENOMANIAN AND TURONIAN SEQUENCES, BOHEMIAN CRETACEOUS BASIN, CZECH REPUBLIC

open access: yesIraqi Geological Journal, 2018
Stable carbon and oxygen isotopes were analysed in the structural CO3 of carbonate-fluorapatite in phosphate nodules and coprolites present in distinctive horizons at the Cenomanian – Turonian boundary and in late Turonian sequence at the ...
Khaldoun S. Al-Bassam
doaj   +1 more source

Mid-Turonian ammonite faunas from northern Mexico

open access: yesGeological Magazine, 1988
AbstractTuronian ammonite assemblages are described from six localities in the Ojinaga and Boquillas formations of Chihuahua in northern Mexico. These assemblages reveal the presence of the middle Turonian zones of Collignoniceras woollgari and Prionocyclus hyatti far to the south of previously documented occurrences. The Mexican collections include co-
Kennedy, W, Cobban, W
openaire   +2 more sources

Mid-Cretaceous acanthomorph fishes with the description of a new species from the Turonian of Lac des Bois, Northwest Territories, Canada

open access: yesVertebrate Anatomy, Morphology, Palaeontology, 2016
A single specimen of a new acanthomorph fish is described from a Turonian locality sampling the northern part of the Cretaceous Western Interior Seaway.
Alison M Murray
doaj   +3 more sources

Upper cretaceous magmatic suites of the Timok magmatic complex [PDF]

open access: yesGeološki Anali Balkanskoga Poluostrva, 2010
The Upper Cretaceous Timok Magmatic Complex (TMC) developed on a continental crust composed of different types of Proterozoic to Lower Cretaceous rocks. The TMC consists of the magmatic suites: Timok andesite (AT) - Turonian-Santonian, Metovnica
Banješević Miodrag
doaj   +1 more source

An Abelisauroid Theropod Dinosaur from the Turonian of Madagascar

open access: yesPLoS ONE, 2013
Geophysical evidence strongly supports the complete isolation of India and Madagascar (Indo-Madagascar) by ∼100 million years ago, though sparse terrestrial fossil records from these regions prior to ∼70 million years ago have limited insights into their biogeographic history during the Cretaceous.
Andrew A Farke, Joseph J W Sertich
openaire   +4 more sources

Taxonomy and paleobiogeography of some Late Cretaceous desmoceratine ammonoids from the northwest Pacific province

open access: yesActa Palaeontologica Polonica
Taxonomy of the Late Cretaceous desmoceratine ammonoid genus “Damesites” and allied taxa is revised and updated based on newly collected population samples from the Yezo Group, Hokkaido, Japan, together with their type specimens.
Tomohiro Nishimura, Haruyoshi Maeda
doaj   +1 more source

The Turonian stage and substage boundaries

open access: yes, 2016
Formal definitions of the Cenomanian-Turonian and lower-middle Turonian boundaries are proposed, following discussions at the Second International Symposium on Cretaceous Stage Boundaries, held in Brussels, 8-16 September 1995. The Global boundary Stratotype Section and Point (GSSP, "golden spike") for the Cenomanian-Turonian boundary should be placed ...
Bengtson, P   +9 more
openaire   +2 more sources

Depositional Facies, Sequence Stratigraphy, and Diagenesis of Lower Cretaceous Carbonate Reservoir, Southern Iraq: Implications for Petroleum Exploration

open access: yesJournal of Petroleum Geology, Volume 49, Issue 2, Page 312-345, April 2026.
ABSTRACT The Lower Cretaceous Yamama Formation of southern Iraq represents a key carbonate reservoir within Iraq and the Middle East, yet its complex depositional facies architecture and diagenetic alterations present challenges for predicting reservoir quality.
A. K. A. Mohammed   +8 more
wiley   +1 more source

Turonian biostratigraphy in a part of Southwestern Bulgaria

open access: yesGeologica Balcanica, 1996
A succession of outcrops in the region west of the town of Breznik has brought new biostratigraphic results concerning the Turonian Stage in the area. Integrated vertical distribution of ammonites, foraminifers, dinoflagellate cysts, pollen and spores is proposed for the first time in Bulgaria.
Velislav Minev   +2 more
openaire   +1 more source

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