Results 31 to 40 of about 1,147 (200)

Biostratigraphy of Acritarchs and Chitinozoans in Ordovician Strata from the Fazel Abad Area, Southeastern Caspian Sea, Alborz Mountains, Northern Iran: Stratigraphic Implications [PDF]

Journal of Sciences, Islamic Republic of Iran, 2017
Sixty-four surface samples from the Lower Palaeozoic rock units (mainly Lalun,Abastu and Abarsaj formations) near Kholin-Darreh village in the Fazel Abad area,southeastern the Caspian Sea, Northern Iran, were analyzed to determine their agerelationships.
M. Ghavidel-syooki
doaj  

Morphologic Variability In Lower Palaeozoic Acritarchs: Importance For Acritarch Systematics

, 2008
Fatka, Oldřich, Brocke, Rainer (2008): Morphologic Variability In Lower Palaeozoic Acritarchs: Importance For Acritarch Systematics.
Fatka, Oldřich, Brocke, Rainer
openaire   +1 more source

Cambrian small shelly fossils from North Greenland (eastern Laurentia; Series 2, Stage 4) with regional and global correlations

Papers in Palaeontology, Volume 12, Issue 4, July/August 2026.
Abstract Cambrian Series 2 represents a key interval for documenting the evolution and diversification of early biomineralized skeletal animals. In this interval, small shelly fossils (SSF) provide an essential archive for regional biostratigraphy and intercontinental correlation.
Yeongju Oh, Tae‐Yoon S. Park, John S. Peel   +2 more
wiley   +1 more source

Data for: Late Permian to Early Triassic changes in acritarch assemblage and acritarch morphology in an oxygenated depositional environmen

, 2018
Acritarch relative abundance and body size and process length ...
van Soelen, E (via Mendeley Data)
core   +1 more source

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1213-1242, July 2026.
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, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

Microbially Mediated Intracellular Barite Mineralization: Evidence From an Early Ediacaran Microfossil in the Doushantuo Formation of South China

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Barite serves as a key proxy for reconstructing paleo‐oceanic productivity and chemistry in modern and ancient marine sediments. Although contemporary barite precipitation involves biological mediation, the mechanisms responsible for ancient barite formation remain unclear.
Shiqi Cheng, Lianjun Feng, Yingjie Yang, Xuelei Chu, Xingliang Zhang, Jinhua Li   +5 more
wiley   +1 more source

Depositional set-up, age and reservoir properties of the heavy oil bearing subsurface Infra-Cambrian-Cambrian sedimentary succession of the Marwar Supergroup, Bikaner–Nagaur Basin (Western Rajasthan), India

Journal of the Palaeontological Society of India
Detailed sedimentological and biostratigraphic studies on the Infra-Cambrian-Cambrian Marwar Supergroup in the key well BGW-A (depth-interval 481–1123 m) in Bikaner–Nagaur Basin have provided a fresh geological insight for depositional facies, reservoir ...
BIJAI PRASAD, SYAMALENDU MAHANTI, S. PRABHAKARAN   +2 more
doaj   +1 more source

LOWER TO MIDDLE ORDOVICIAN ACRITARCHS AND CHITINOZOANS FROM NORTHERN KARAKORUM MOUNTAINS, PAKISTAN

Rivista Italiana di Paleontologia e Stratigrafia, 2000
The lower Vidiakot section (Chitral, Pakistan) comprises the lower part (Yarkhun Formation and the base of the Vidiakot Formation) of the terrigenous complex transgressively overlying the crystalline basement of Northern Karakorum.
MARCO QUINTAVALLE, MARCO TONGIORGI, MAURIZIO GAETANI   +2 more
doaj   +1 more source

Fossiliferous boulders of Lower Cambrian phosphoritic sandstone in southwestern Finland [PDF]

Bulletin of the Geological Society of Finland, 1983
The paper deals with fossiliferous sandstone boulders from three localities in southwestern Finland. The largest of the boulders was found on the west coast west of Olkiluoto.
J.J. Lehtovaara, R. Tynni
doaj   +1 more source

New Zealand Geological Timescale 2025

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
New Zealand Geological Timescale 2025 (NZGT 2025) is the first comprehensive update and revision of the New Zealand Geological Timescale in a decade. The criteria used to establish age ranges of New Zealand Stages within the NZGT have been reviewed, calibrated, and revised where required against the 2023/04 International Chronostratigraphic Chart and ...
Christopher D. Clowes, James S. Crampton, Kyle J. Bland, J. Ian Raine, Andrew F. Boyes, Hamish J. Campbell, Erica M. Crouch, Martin P. Crundwell, Neville Hudson, Elizabeth M. Kennedy, Donald A. B. MacFarlan, Hugh E. G. Morgans, Marcus D. Richards, Matthew W. Sagar   +13 more
wiley   +1 more source