搜索结果: 1-15 共查到“理学 Devonian”相关记录24条 . 查询时间(0.097 秒)
First Records of Late Devonian Entomozoacean Ostracods in North-western Turkey
Ostracods Entomozoacea Late Devonian Frasnian Turkey
2011/6/28
Entomozoacean ostracods (pelagic socalled fingerprint-ostracods) have recently been observed for the first time in Upper Devonian sediments of the Darlık B Section from the İstanbul region, ...
Meemannia eos , a basal sarcopterygian fish from the Lower Devonian of China – expanded description and significance
Lower Devonian of China – expanded description significance Meemannia eos
2014/3/26
Additional morphological and histological features of a stem-group sarcopterygian fish Meemannia eos (Zhu et
al. 2006) are provided, including dermal bone features, endocranial structures in the o...
Carbon isotope stratigraphy across the Silurian-Devonian transition in Zoige (West Qinling), China
Chemostratigraphy carbon isotope palaeontology Silurian-Devonian Boundary West Qinling, China.
2014/3/26
Carbon isotope (δ
13
C
org
) analyses of neritic carbonates and black shales spanning the Silurian-Devonian transition are
compared from two richly fossiliferous sequences in Zoige County (West Q...
Siluro-Devonian vertebrate biostratigraphy and biogeography of China
Biostratigraphy Biogeography Early vertebrates Siluro-Devonian China
2014/3/26
During the past three decades, early vertebrates from the mid-Paleozoic of China have attracted extensive attention on account of their distinc-tive anatomical features, high diversity, early stratigr...
A new antiarch fish from the Upper Devonian Zhongning Formation of Ningxia, China
Placodermi Late Devonian Phylogeny Paleogeography
2014/3/26
A new antiarch, Ningxialepis spinosa n. gen. n. sp., is described from the Zhongning Formation (Famennian, Late Devonian) of Shixiagou,
Qingtongxia, Ningxia, northwestern China. It is characterized b...
Carbon isotope stratigraphy across the Silurian-Devonian transition in Zoige (West Qinling), China
carbon isotope palaeontology Silurian-Devonian Boundary West Qinling, China
2014/3/26
Carbon isotope (δ
13
C
org
) analyses of neritic carbonates and black shales spanning the Silurian-Devonian transition are
compared from two richly fossiliferous sequences in Zoige County (West Q...
Devonian Calcareous Green Algal Flora of the Rannach Nappe(Graz Palaeozoic,Austria)
Devonian green algae mass occurrences Graz Palaeozoic Austria
2009/12/7
The Lower to Middle Devonian (Emsian – Eifelian) calcareous green algal flora of the Graz Palaeozoic (Austria) contains halimedalean representatives of Pseudolitanaia, Pseudopalaeoporella, Zeapora, Ma...
Diagenetic influences on iron-bearing minerals in Devonian carbonate and siliciclastic rocks of Estonia
Devonian diagenesis carbonate rocks siliciclastic rocks mixed carbonate-siliciclastic rocks
2009/10/22
The Estonian Devonian sediments consist of carbonate, siliciclastic, and mixed carbonate-siliciclastic deposits that have undergone extensive dolomitization. Chemical analysis of 165 samples and XRD m...
Dolomitization and sedimentary cyclicity of the Ordovician,Silurian,and Devonian rocks in South Estonia
dolomitization sedimentary cyclicity diagenesis dolomite XRD porosity
2009/10/21
The distribution and composition of dolomitized rocks and stoichiometry of dolomite in southern Estonia in the Ordovician, Silurian, and Devonian were studied on the background of the facies, sediment...
Karksilepis parva gen.et sp.nov.(Chondrichthyes)from the Burtnieki Regional Stage,Middle Devonian of Estonia
Chondrichthyes Burtnieki Regional Stage Middle Devonian Estonia
2009/10/21
Dermal scales of a new chondrichthyan were discovered in four levels in sandstones of the Härma Beds (lower part of the Burtnieki Regional Stage, Middle Devonian) in the Karksi outcrop of South E...
Late Silurian-Early Devonian tessellated heterostracan Oniscolepis Pander,1856 from the East Baltic and North Timan
Silurian Devonian East Baltic North Timan Heterostraci exoskeletal units
2009/10/21
Pander (1856, Monographie der fossilen Fische der silurischen Systems der Russisch–Baltischen Gouvernements.Obersilurische Fische. Buchdruckerei Kaiserlichen Akademie des Wissenschaften, St. Pete...
Roundness and surface features of quartz grains in Middle Devonian deposits of the East Baltic and their palaeogeographical implications
East Baltic Devonian roundness of detrital particles surface texture of quartz
2009/10/21
The roundness and surface texture of quartz grains were studied in Devonian sediments of 32 drill cores. Roundness was estimated in more than 800 samples and surface textures were examined under scann...
Systematic position,distribution,and shell structure of the Devonian linguloid brachiopod Bicarinatina bicarinata (Kutorga,1837)
Brachiopoda Bicarinatina shell structure Middle Devonian Estonia Latvia Russia
2009/10/21
The type species of the brachiopod genus Bicarinatina Batrukova was first described by Kutorga in 1837 (Zweiter Beitrag zur Geognosie und Paläaontologie Dorpats und seiner nächsten Umbegebun...
New information on the Devonian shark Mcmurdodus,based on material from western Queensland,Australia
Mcmurdodus Devonian Hexanchiformes Echinorhinus Prismatic calcified cartilage
2009/10/20
Histological structure of the type and newly collected teeth of the shark Mcmurdodus whitei TURNER &YOUNG,1987, from a Devonian (?late Emsian-early Eifelian) limestone outcrop in the Cravens Peak Beds...
Upper Frasnian rocks of Utah and Nevada yielded several multicuspid, low-crowned shark teeth. It is proposed that they were used mainly for filtering food from water. Two new chondrichthyan species be...