Results 1 to 10 of about 39,068 (353)

NEW GROUP OF TOURNAISIAN ADVANCED SIPHONODELLA (CONODONTS, LOWER CARBONIFEROUS)

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2022
A new morphological group of advanced Siphonodella with diagonal or/and longitudinal ribbed ornamentation on the upper side of the platform of the P1 elements was identified and described based on the author's paleontological material from the Polar ...
Artem Plotitsyn
doaj   +1 more source

Evolution of leaf-form in land plants linked to atmospheric CO2 decline in the Late Palaeozoic era [PDF]

open access: yes, 2001
The widespread appearance of megaphyll leaves, with their branched veins and planate form, did not occur until the close of the Devonian period at about 360 Myr ago.
AH Knoll   +32 more
core   +1 more source

Soil radium, soil gas radon and indoor radon empirical relationships to assist in post-closure impact assessment related to near-surface radioactive waste disposal [PDF]

open access: yes, 2009
Least squares (LS), Theil’s (TS) and weighted total least squares (WTLS) regression analysis methods are used to develop empirical relationships between radium in the ground, radon in soil and radon in dwellings to assist in the post-closure assessment ...
J.D. Appleton   +32 more
core   +4 more sources

Namurian [PDF]

open access: yes, 2006
Carboniferous rocks had a great impact on the landscape and industrialisation of western Europe, hence a distinction between ‘Carboniferous limestone’ and ‘Coal Measures’ since the dawn of geological science.
Dusar, M.
core  

Paleomagnetism of Phanerozoic Geological Complexes in Tuva

open access: yesВестник Камчатской региональной ассоциации "Учебно-научный центр". Серия: Науки о Земле, 2020
The authors have investigated palaeomagnetically the Ordovician, Upper Devonian and Lower Carboniferous strata in Tuva. In the rocks, postfolding secondary and prefolding magnetization components were isolated.
Коваленко Д.В.   +3 more
doaj   +1 more source

Nature and timing of Late Mississippian to Mid-Pennsylvanian glacio-eustatic sea-level changes of the Pennine Basin, UK [PDF]

open access: yes, 2012
The Pennine Basin of northern England contains a comparatively complete Serpukhovian– Moscovian succession characterized by high-resolution ammonoid zonation and cyclic paralic sedimentation.
Condon, Daniel J., Waters, Colin N.
core   +2 more sources

A reconnaissance geochemical drainage survey of the Criffel-Dalbeattie granodiorite complex and its environs [PDF]

open access: yes, 1977
Regional geochemical reconnaissance by stream sediments and panned concentrates was undertaken over an area of 850 km 2 of south-west Scotland. Rocks of Ordovician to Permian age are exposed within the area but the major part is occupied by the ...
Brown, M.J.   +3 more
core  

Sedimentology and kinematics of a large, retrogressive growth-fault system in Upper Carboniferous deltaic sediments, western Ireland [PDF]

open access: yes, 2004
Growth faulting is a common feature of many deltaic environments and is vital in determining local sediment dispersal and accumulation, and hence in controlling the resultant sedimentary facies distribution and architecture.
Busch D.A.   +12 more
core   +1 more source

Variscan sourcing of Westphalian (Pennsylvanian) sandstones in the Canobie Coalfield, UK [PDF]

open access: yes, 2010
The zircon age spectrum in a sample from the Canonbie Bridge Sandstone Formation (Asturian) of southern Scotland contains two main peaks. One is Early Carboniferous in age (348– 318 Ma), and corresponds to the age of igneous activity during the ...
ANDREW MORTON   +21 more
core   +1 more source

Sedimentary facies of clastic-platform carbonate sediment strata of epicontinental sea in the Daniudi Gasfield, Ordos Basin

open access: yesNatural Gas Industry B, 2021
Mixed deposition is a sedimentary phenomenon of special significance to the tectonic movement, material supply, sea level change, and paleoclimate of the sedimentary environment.
Guangquan Zhang, Lidong Mi
doaj   +1 more source

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