Results 61 to 70 of about 8,547 (241)
New data on psammosteid heterostracans (Pteraspidomorpha) and acanthodians (Acanthodii) from the Pärnu Regional Stage (Lower Eifelian, Middle Devonian) of Estonia [PDF]
Estonian Journal of Earth Sciences, 2018 Vertebrate remains from the Lower Eifelian Pärnu Formation, Estonia, are described. New data on the topography of ornamentation and histology of psammosteids from the Pärnu Regional Stage are presented.
Vadim N. Glinskiy, Darya V. Pinakhina
doaj +1 more source
The cyathaspids of the Red Bay Group (Lower Devonian) of Spitsbergen
Polar Research, 1983 Description and validation of the cyathaspids (Vertebrata, Heterostraci) from the Red Bay Group of Spitsbergen, previously introduced and/or described by Kim (1930, 1932) and Kiax & A. Heinz (1935). The following species are defined: Dinaspidella robusta; Irregularempis hoeli, I. mirabilis n. sp. ; Poraspis Polaris, P. breuis, P.
ALAIN BLIECK, NATASCHA HEINTZ
openaire +1 more source
Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil
Meteoritics &Planetary Science, EarlyView.Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta +9 more
wiley +1 more source
Stratigraphy of the uppermost Old Red Sandstone of Svalbard (Mimerdalen Subgroup) [PDF]
Polar Research, 2014 Between the fjords Dicksonfjorden and Billefjorden in central Spitsbergen, Svalbard's youngest deposits (Early Givetian to Famennian in age) of the Old Red Sandstone—the Mimerdalen Subgroup—are exposed.
Karsten Piepjohn, Winfried K. Dallmann
doaj +1 more source
Geophysical investigation of the Santa Marta impact structure—Piauí State, Brazil
Meteoritics &Planetary Science, EarlyView.Abstract The Santa Marta impact structure in northeastern Brazil, recognized as a partially preserved complex crater, was investigated through an integrated geophysical study employing magnetotelluric (MT) and gravity methods. Our research provides constraints on the crater's subsurface architecture.
Elienara Vasconcelos +5 more
wiley +1 more source
Upper Silurian and Lower Devonian conodonts from Tafilalt, southeastern Morocco. [PDF]
, 2014 The conodont association from three Silurian-Lower Devonian sections (Bou Tchrafine N2, Atrous 3 and Atrous 7) in the Tafilalt (southeast Morocco) are presented.
CORRADINI C +7 more
core +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract We investigated the structural framework of the north–northwestern Paraná Basin in Brazil to test whether the pre‐impact structures in this region may have had any influence on the first‐order formation and morphostructure of the Araguainha impact structure (AIS).
Renato B. Bernardes +5 more
wiley +1 more source
The Lower Devonian Water Canyon formation of Northeastern Utah
, 1963 In 1948 Williams subdivided the Jefferson Formation of northeastern Utah into two formations. The upper formation was referred to as the Late Devonian Jefferson Formation and the lower formation the Early Devonian Water Canyon Formation (Williams, 1948 ...
Taylor, Michael E.
core +1 more source
Novel conducting tissues in Lower Devonian plants [PDF]
Botanical Journal of the Linnean Society, 2000 Elongate cells presumed to comprise water-conducting tissues are described from the central regions of short lengths of two naked, stomatiferous, coalified, axial fossils from Lochkovian (Lower Devonian) fluvial rocks in the Welsh Borderland. In one, a discrete central strand is predominantly composed of uniformly thickened cells that are compared with
D. EDWARDS, L. AXE
openaire +1 more source
Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure
Meteoritics &Planetary Science, EarlyView.Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark +8 more
wiley +1 more source