Results 131 to 140 of about 8,547 (241)

UPPER DEVONIAN ACRITARCHS AND MIOSPORES FROM THE GEIRUD FORMATION IN CENTRAL ALBORZ RANGE, NORTHERN IRAN [PDF]

open access: yesJournal of Sciences, Islamic Republic of Iran, 1994
The Geirud Formation consists mainly of clastic sediments which are interbedded with limestone stringers. This rock unit is well-exposed along the Central Alborz Range in northern Iran.
doaj  

Microbially induced sedimentary structures in fluvial settings: the gas domes from the Bolzano Megacaldera (Permian, Italy)

open access: yesSedimentology, Volume 73, Issue 4, Page 914-944, June 2026.
ABSTRACT Gas domes serve as some of the earliest and most persisting indicators of life on Earth, yet their documentation in continental environments remains sparse. This study aims to bridge this gap by examining gas domes within the Permian fluvial succession of Monte Luco, located in the caldera of the Bolzano Supervolcano. These structures occur as
Andrea Baucon   +5 more
wiley   +1 more source

Upper Devonian and Lower Mississippian Conodont faunas, north-central Iowa

open access: yes, 1964
Conodonts are rare in the Shell Rock Formation, but they support the previous assignment of this formation to the lower part of the Upper Devonian. Conodont species diagnostic of the Lower Palmatolepis gigas Zone (Upper Devonian, toIγ) occur in the upper
Anderson, Wayne I.
core  

The role of epigenesis in the formation of the Lower Devonian carbonate reservoir of the Gamburtsev swell (Timan-Pechora petroleum province) [PDF]

open access: yesНефтегазовая геология: Теория и практика
Based on lithological and mineralogical studies and the distribution features of C, O isotopes and Sr, Ba, F elements in the carbonate strata of the Lower Devonian reservoir of the swell, the main epigenetic processes in the rocks were determined, the ...
Maydl' T.V.   +2 more
doaj  

Devonian Sandstone Lithostratigraphy, Northern Arkansas

open access: yes, 1977
Two areas of Devonian sandstone development may be recognized in northern Arkansas. In northwestern Arkansas, the Clifty Formation comprises a massively bedded, super mature quartz arenite of Middle Devonian age overlain by thinner bedded, phosphatic ...
Manger, Walter L., Hall, Jeffery D.
core  

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