Results 41 to 50 of about 46,126 (273)
A reappraisal of the Italian record of the Cretaceous pachycormid fish Protosphyraena Leidy, 1857 [PDF]
, 2017 The genus Protosphyraena is known mainly from partial remains, consisting of isolated blade-like teeth, conical rostra and scythe-like pectoral fins. This paper provides a new insight into partial specimens of the genus Protosphyraena from the Cretaceous
Amalfitano, Jacopo +3 more
core +3 more sources
Hotspots, trends, and regional focus on oil or gas exploration: A bibliometric comparative study
Deep Underground Science and Engineering, EarlyView.This paper explores the research trends in global oil and gas exploration through the bibliometric analysis of 3460 articles collected from the Web of Science database on oil and gas exploration published from 2013 to 2023. The research hotspots, objects, regional distribution, methods, and evaluation methods of oil and gas exploration are analyzed and
Jihong Wang +3 more
wiley +1 more source
Conodont biostratigraphy of the Crawford Group, Southern Uplands, Scotland [PDF]
, 2002 Extensive new conodont collections from the Crawford Group, the oldest succession in the Southern Uplands of Scotland, support the previously documented biostratigraphical ages for the included formations.
Armstrong, Howard A. +3 more
core +1 more source
Deep Underground Science and Engineering, EarlyView.Particle rounding effects comparison of different methods: (a), (b), and (c) are the rounding results using the B‐spline curve method with different R; (d), (e), and (f) are the results of vertex rounding substitution method with different rounding radii.
Jiabin Dong +6 more
wiley +1 more source
Black shale deposition during Toarcian super-greenhouse driven by sea level [PDF]
Climate of the Past, 2013 One of the most elusive aspects of the Toarcian oceanic anoxic event (T-OAE) is the paradox between carbon isotopes that indicate intense global primary productivity and organic carbon burial at a global scale, and the delayed expression of anoxia in ...
M. Hermoso, F. Minoletti, P. Pellenard
doaj +1 more source
A mineral reconnaissance survey of the Abington-Biggar-Moffat-area, south-central Scotland [PDF]
, 1979 Panned heavy mineral concentrates, mostly obtained from stream sediments, were collected from 195 sites in the Abington-Biggar-Moffat area. The project area, which lies immediately east of the formerly important mining district of Wanlockhead ...
Dawson, J., Floyd, J.D., Phillip, P.R.
core
Gold in Devono-Carboniferous red beds of northern Britain [PDF]
, 2015 We are grateful to D. Craw and an anonymous reviewer for comments that helped to clarify the paper.
Bellis, David +3 more
core +1 more source
Deep Underground Science and Engineering, EarlyView.Hydraulic fracturing in tight sandstone and fracture propagation characteristics using backscattered electron‐scanning electron microscope (BSE‐SEM) images. Abstract This study focuses on hydraulic fracturing experiments conducted under triaxial conditions on tight sandstone specimens from Shivpuri district, Madhya Pradesh, India.
Pankaj Rawat, Narendra Kumar Samadhiya
wiley +1 more source
Occurrence and distribution of barite in the permo-triassic siksikpuk formation along the Brooks Range haul road [PDF]
, 1980 Barite commonly occurs in Permian to Triassic age rocks along the north flank of the Brooks Range. The Siksikpuk Formation (Wolfcampian to lowest Guadalupian age) is noted for its barite and is well exposed in the vicinity of Galbraith Lake along the ...
Payne, M.W.
core
Deep Underground Science and Engineering, EarlyView.The rock failure mode is significantly influenced by the contributing factors, such as the joint inclination, the initial confining pressure, and the unloading point. We found six typical rock failure modes after a large number of numerical tests. Abstract Excavation unloading damages rock masses, with preferential failure along geological defects in ...
Fei Liu +4 more
wiley +1 more source