Geofluids, Volume 2021, Issue 1, 2021., 2021 The pore structure characterization and its controlling factors in overmature shales are keys to understand the shale gas accumulation mechanism. Organic matter in source rocks is a mixture of various macerals that have their own specific evolutionary pathways during thermal maturation. Pores within macerals also evolve following their own path.
Lin Wei +8 more
wiley +1 more source
Graptolites from Silurian (Llandovery Series) sedimentary deposits attributed to a forearc setting, Co To Formation, Co To archipelago, northeast Vietnam [PDF]
, 2020 Newly collected graptolites from the Co To Formation, Co To archipelago, NE Vietnam, comprise assemblages indicative of two biostratigraphical levels within the lower Silurian, Llandovery Series, Telychian Stage: the co-occurrence of Spirograptus ...
Doan, Hung Dinh +9 more
core +1 more source
Upper Sandbian–lower Katian bio- and chemostratigraphy in the Pajevonys-13 core section, Lithuania [PDF]
Estonian Journal of Earth Sciences, 2016 The succession of five formations (Auleliai, Vilučiai, Alvitas, Šakiai, Jakšiai) corresponding to the upper Sandbian and lower Katian in southern Lithuania is dated based on new bio- and chemostratigraphical data from the Pajevonys-13 core section.
Linda Hints +4 more
doaj +1 more source
Microfossils in the Ordovician erratic boulders from Southwestern Finland [PDF]
Bulletin of the Geological Society of Finland, 1995 Chitinozoans, ostracods and acritarchs found in four glacially transported limestone boulders from the south-western coast of Finland have been studied in order to test the usefulness of these microfossil groups in age determinations. Also rare specimens
J. Nõlvak, T. Meidla, A. Uutela
doaj +1 more source
Geochemistry and correlation of volcanic ash beds from the Rootsiküla Stage (Wenlock–Ludlow) in the eastern Baltic [PDF]
Estonian Journal of Earth Sciences, 2011 Nine altered volcanic ash samples from the shoal and lagoonal sediments of the Rootsiküla Stage (Wenlock–Ludlow boundary interval, Estonia) were analysed, compared and correlated with five samples of deep sea environments from Latvia.
Tarmo Kiipli +5 more
doaj +1 more source
An in situ shelly fauna from the lower Paleozoic Zapla diamictite of northwestern Argentina: implications for the age of glacial events across Gondwana [PDF]
, 2015 A shelly fauna from the upper part of the Zapla glacial diamictite includes thelingulate brachiopod Orbiculoidea radiata Troedsson, the rhynchonelliforms Dalmanella cf. testudinaria (Dalman) and Paromalomena sp., the bivalve Modiolopsis?
Benedetto, Juan Luis Arnaldo +3 more
core +2 more sources
Paleoceanography and Paleoclimatology, Volume 35, Issue 12, December 2020., 2020 Abstract Variations in depositional rates affect the temporal depositional resolutions of proxies used for paleoenvironmental reconstructions; for example, condensation can make reconstructed environmental changes appear very abrupt. This is commonly addressed by transforming proxy data using age models, but this approach is limited to situations where
E. Jarochowska +5 more
wiley +1 more source
A summary and revision of the East Baltic Silurian chitinozoan biozonation [PDF]
Estonian Journal of Earth Sciences, 2012 The biostratigraphical data on the East Baltic Silurian chitinozoans are summarized. Based on the study of nine East Baltic drill cores, 28 regional chitinozoan zonal units, including 26 biozones and 2 interzones, are briefly characterized. In comparison
Viiu Nestor
doaj +1 more source
Palynomorphs from abra límite, zenta range, Eastern Cordillera, Northwestern Argentina [PDF]
, 2010 This study presents the first Devonian palynological record in the Zenta Range in Eastern Cordillera, Argentina. Two associations were recognized on the basis of differences in palynomorphs and palynofacies.
Di Pasquo Lartigue, Maria +1 more
core +1 more source
Darriwilian (Middle Ordovician) conodont biostratigraphy in NW Estonia [PDF]
Estonian Journal of Earth Sciences, 2012 Darriwilian conodonts have been studied in numerous sections of Baltoscandia, but few data are available from the classical outcrop area in northern Estonia. In this paper we report the succession of Darriwilian conodonts and chitinozoans from the bed-by-
Olle Hints, Viive Viira, Jaak Nõlvak
doaj +1 more source