Results 61 to 70 of about 8,458 (202)

Increased Continental Exposure as a Driver of Carbon Drawdown and Initiation of the Late Paleozoic Ice Age

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Earth experienced a long‐term cooling trend during the middle‐late Devonian, culminating in the Late Paleozoic Ice Age (LPIA)—the longest icehouse in Earth's history. The onset of glaciation has been attributed to CO2 removal through silicate weathering, however previous carbon cycle models have failed to reproduce its timing. Here, we build a
Yinggang Zhang, Shuai Yuan, Benjamin J. W. Mills, Andrew S. Merdith, Yongyun Hu, Maoyan Zhu   +5 more
wiley   +1 more source

The importance of Hindeodus parvus (Conodonta) for the definition of the Permian-Triassic boundary and evaluation of the proposed sections for a global stratotype section and point (GSSP) for the base of the Triassic

Geologija, 1995
The biostratigraphic Permian/Triassic (P/T) boundary is defined by the first appearance of H. parvus. The first appearance of H. parvus within the dine H. latidentatus-H.
Yurij D. Zakharov, Cheng-yuan Wang, Anton Ramovš, Heinz W. Kozur   +3 more
doaj  

NEW DATA ON MIDDLE DEVONIAN CONODONTS FROM SW-SARDINIA:THE SU NUARGI II SECTION REVISITED

Rivista Italiana di Paleontologia e Stratigrafia, 2013
The conodont collection from the nodular limestone beds of the Su Nuargi II outcrop near Domusnovas in SW-Sardinia (Italy) is restudied for the purpose of reassessing the outcrop and updating the conodont collection to the most recent taxonomy. Su Nuargi
SOFIE GOUWY
doaj   +1 more source

Darriwilian (Middle Ordovician) conodont biostratigraphy in NW Estonia [PDF]

Estonian Journal of Earth Sciences, 2012
Darriwilian conodonts have been studied in numerous sections of Baltoscandia, but few data are available from the classical outcrop area in northern Estonia. In this paper we report the succession of Darriwilian conodonts and chitinozoans from the bed-by-
Olle Hints, Viive Viira, Jaak Nõlvak
doaj   +1 more source

Almost billfish: convergent longirostry, micro‐dentition, and possible glandular sinuses in a large teleost fish from the Upper Cretaceous of Northern Italy

Journal of Anatomy, Volume 247, Issue 6, Page 1109-1130, December 2025.
A fossil rostrum fragment of a large teleost fish from the Upper Cretaceous of Northern Italy reveals remarkable anatomical convergences with Cenozoic and Recent billfishes (marlins, swordfishes, and akin). The extinct group Plethodidae independently acquired a long snout, micro‐teeth, and oil‐gland sinuses well before the evolution of true billfishes.
Giovanni Serafini, Jürgen Kriwet, Tommaso Toldo, Eliana Fornaciari, Jacopo Amalfitano, Giorgio Carnevale   +5 more
wiley   +1 more source

LATE DEVONIAN-CARBONIFEROUS CONODONTS FROM EASTERN IRAN

Rivista Italiana di Paleontologia e Stratigrafia, 1999
Conodont data from acid-leaching 110 samples from two Late Devonian-Carboniferous areas in the Shotori Range (Tabas region) of eastern Iran are presented.
MEHDI YAZDI
doaj   +1 more source

Diversity and development of the hemibacula of croaking geckos (Sphaerodactylidae: Aristelliger)

Journal of Anatomy, Volume 247, Issue 6, Page 1145-1156, December 2025.
Geckos in the genus Aristelliger exhibit enigmatic mineralized elements in their hemipenes, called hemibacula. We examined hemibacula of every species of Aristelliger using μCT, clearing and staining, and histology. We found hemibacula exhibit lineage‐specific morphology, isometric growth after sexual maturity, and are composed of mineralized ...
Aaron H. Griffing, Daniel J. Paluh, Jonathan C. DeBoer, Juan D. Daza, Tony Gamble, Anthony P. Russell, Aaron M. Bauer   +6 more
wiley   +1 more source

Conodont zonation of Lower Triassic strata in Slovenia

Geologija, 2015
The paper presents the results of a conodont study carried out in the Triassic strata in the area of the Slovenian part of the Southern Alps, External Dinarides and the Transition region between the External and Internal Dinarides.
Tea Kolar-Jurkovšek, Bogdan Jurkovšek
doaj   +1 more source

Composition, structure and model of the formation of conodont lamellar tissue

Литосфера, 2020
Research subject. This research was focused on the most common mineralized tissue that composes conodont elements. The aim was to investigate the characteristics of the composition and structure of this tissue and to reconstruct its formation process ...
A. V. Zhuravlev
doaj   +1 more source

Sedimentological characterisation is a necessary prerequisite for interpretation of stable carbon isotope ratios of bulk sediment from reefal settings

Sedimentology, Volume 72, Issue 7, Page 2361-2392, December 2025.
ABSTRACT For most of Earth history, carbonate sediments deposited in shallow marine settings are the only remaining archive of changing biogeochemical cycles. All deep‐sea sediments older than >200 Ma have been subducted and are therefore lost from the record. Stable carbon isotope (δ13C) values of shallow marine carbonates are available for older time
Colleen N. Brown, Sam J. Purkis, Eberhard Gischler, Amanda M. Oehlert   +3 more
wiley   +1 more source