Results 61 to 70 of about 3,102 (219)

New biostratigraphic and chemostratigraphic data from the Chicotte Formation (Llandovery, Anticosti Island, Laurentia) compared with the Viki core (Estonia, Baltica) [PDF]

Estonian Journal of Earth Sciences, 2009
Due to the lack of biostratigraphically useful graptolites in the crinoidal and reefal Chicotte Formation on Anticosti Island (Québec, Canada), the precise chronostratigraphic position of the formation is not known. New stable carbon isotope and conodont
Munnecke, Axel, Männik, Peep
doaj  

Linking palaeo‐wildfire to depositional environmental and ecological dynamics of an Early–Middle Pennsylvanian fluvial‐tidal transition zone—Palynology and pyrolysis evidence

The Depositional Record, Volume 12, Issue 1, February 2026.
The Pennsylvanian landscape in the Forest City basin was characterised by low‐lying lycopod tree and fern swamp forests with persistently high groundwater tables and adjacent fluvial channel, floodplain and upland environments. The occurrence of abundant charcoal within a specific thin interval in the Cherokee Group indicates substantial wildfire ...
Dustin Northrup, Emily Finzel, Pierre Zippi, Kevin Bohacs   +3 more
wiley   +1 more source

Ordovician conodonts from the Mithaka Formation (Georgina Basin, Australia). Regional and paleobiogeographical implications

Geologica Acta, 2005
The systematic analysis of conodonts from the previously unstudied Mithaka Formation (Georgina Basin) yielded 1366 identifiable elements, representing 25 species and 21 genera. One new species was recovered and identified, Triangulodus mithakensis n. sp.
T. KUHN, C. Barnes
doaj   +1 more source

Reconstructing Environmental and Microbial Ecosystem Changes Across the Permian–Triassic Mass Extinction at Lusitaniadalen, Svalbard

Paleoceanography and Paleoclimatology, Volume 41, Issue 2, February 2026.
Abstract The Permian–Triassic environmental crisis triggered fundamental changes in marine ecosystems, culminating in the most severe biodiversity crisis of the Phanerozoic. Yet, the environmental and geochemical conditions governing the crisis and ecosystem recovery remain debated.
S. Z. Buchwald, A. B. Frank, D. Birgel, K. Senger, T. Mosociova, Y. Pei, B. Beaty, L. G. Tarhan, F. Galasso, M. A. Gómez Correa, S. E. Grasby, U. Struck, D. Yuan, R. Steinkrauss, J. Gliwa, N. Lahajnar, J. Peckmann, W. J. Foster   +17 more
wiley   +1 more source

Note on the use of hydrofluoric acid for the recovery of conodonts from Ordovician cherts in the Southern Uplands of Scotland and the significance of the conodonts

, 1993
. Procedures have been described for the recovery of conodonts from cherts by dissolution in hydrofluoric acid (see Stone, 1987 for a review), but this technique rarely has been applied.
Raymond L. Etherington, Ronald L. Austin
core   +1 more source

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

Conodont micropaleontology and biostratigraphy of the Silverwood limestone member, Universal limestone member, and Salt Creek limestone lens (Desmoinesian)

, 1982
Conodonts were extracted from three limestone units in westcentral Indiana: the Silverwood Limestone Member of the Staunton Formation; the Universal Limestone Member of the Dugger Formation; and from a new unit, the informally named Salt Creek limestone ...
Stanley, Sarah G.
core  

Conodonts of the Dounans Limestone, Highland Border Complex, Scotland

, 1991
. A meager collection of conodonts recovered from the Dounans Limestone near Aberfoyle, Perthshire, consists for the most part of species with North American affinities.
R. L. Ethington, R. L. Austin
core   +1 more source

Conodonts in Ordovician Chronostratigraphy

, 2015
The great importance of conodonts in Ordovician chronostratigraphy is shown by the fact that conodonts are used for the definition of two of the seven global stages, and seven of the 18 stage slices, now recognized within this ...
FERRETTI, Annalisa, Bergström, Stig M.
core  

Conodonts in Biostratigraphy. A 300-million-years long journey through geologic time [PDF]

Conodonts are tooth -like elements of a primitive chordate and are generally abundant in many marine sedimentary rocks deposited from the late Cambrian to the latest Triassic.
Carlo Corradini, Charles Henderson, Ferretti, A, Corradini, C, Henderson, C, James E. Barrick, Barrick, JE, Annalisa Ferretti   +7 more
core   +1 more source