Automated graptolite identification at high taxonomic resolution using residual networks [PDF]
iScienceSummary: Graptolites, fossils significant for evolutionary studies and shale gas exploration, are traditionally identified visually by taxonomists due to their intricate morphologies and preservation challenges.
Zhi-Bin Niu, Si-Yuan Jia, Hong-He Xu
doaj +2 more sources
The Early to Middle Ordovician graptolite faunal succession of the Trail Creek region, central Idaho, U.S.A [PDF]
Geologica Acta, 2005 The Middle Ordovician graptolite biostratigraphy of the Trail Creek region of Idaho is reviewed and revised. The oldest known fauna belongs to the Didymograptellus bifidus Biozone. The Isograptus victoriae lunatus, I.
J. Maletz, D. Goldman, M. Cone
doaj +6 more sources
Influence of quartz types on mechanical parameters in the early silurian Longmaxi shale, Sichuan Basin [PDF]
Scientific ReportsQuartz is one of the most abundant minerals in shales, occurring predominantly in three forms: biogenic quartz (BQ), detrital quartz (DQ) and clay-transformed quartz (CTQ).
Qin Zhang +9 more
doaj +2 more sources
Characteristics of three organic matter pore types in the Wufeng-Longmaxi Shale of the Sichuan Basin, Southwest China [PDF]
Scientific Reports, 2018 A consensus has been reached through previous studies that organic matter (OM) pores are crucial to porosity in many shale gas reservoirs; however, their origins and types remain controversial.
Haikuan Nie, Zhijun Jin, Jinchuan Zhang
doaj +2 more sources
Tremadocian Graptolite-Conodont Biostratigraphy of the South American Gondwana margin (Eastern Cordillera, NW Argentina) [PDF]
Geologica Acta, 2005 The Tremadocian graptolite and conodont faunas of the Gondwana Margin recorded at the Eastern Cordillera (EC) of Salta and Jujuy provinces (northwestern Argentina) are studied.
G. DEL CARMEN ORTEGA, G.L. ALBANESI
doaj +4 more sources
Silurian bentonites in Lithuania: correlations based on sanidine phenocryst composition and graptolite biozonation – interpretation of volcanic source regions [PDF]
Estonian Journal of Earth Sciences, 2014 Integrated correlation of bentonites (altered volcanic ashes) and graptolite biozonation is presented. Detailed study of two Lithuanian drill core sections extended previous knowledge of the occurrence and composition of bentonites to the south ...
Tarmo Kiipli +2 more
doaj +3 more sources
Biogeographic dynamics of graptolite species during the end-Ordovician mass extinction in South China [PDF]
Estonian Journal of Earth Sciences, 2023 Spatial and temporal analysis of geographical biodiversity dynamics and reconstruction of species distribution areas are essential for revealing the patterns of evolution of graptolites and their survival strategies during bio-events.
Qing Chen, Linna Zhang
doaj +1 more source
Energies, 2022 Graptolite-rich shale is the main layer of shale gas resources in the southern marine sedimentary basin. Recently, shale gas resources were discovered in the Ordovician marine graptolite-rich strata in the Ordos Basin.
Fengjiao Li +8 more
doaj +1 more source
A new species of the problematic organism Webbyites from the Early Ordovician Fezouata Biota of Morocco [PDF]
Estonian Journal of Earth Sciences, 2023 The problematic colonial organism Webbyites has previously been considered to be a hydroid (phylum Cnidaria). In this paper, we describe a new species, Webbyites felix sp. nov., from the Early Ordovician Fezouata Konservat-Lagerstätte of Morocco.
Lucy A. Muir +1 more
doaj +1 more source
Tremadocian (Ordovician) reclined graptolites from Baishan, North China [PDF]
Estonian Journal of Earth Sciences, 2023 The Erdaopuzi section in the Baishan area of Jilin Province, northeast China, contains abundant late Tremadoc graptolites. However, there are some taxonomic controversies regarding the characters of the hand specimens that are difficult to identify.
Ming Li +3 more
doaj +1 more source