Results 41 to 50 of about 35,431 (277)

Petrology and geochemistry of volcanic and subvolcanic rocks in the south of Asagi igneous complex, northwest of Zahedan, Sistan Suture Zone [PDF]

پترولوژی
IntroductionThe Asagi igneous complex is located in the northwest of Zahedan city (Figure 1A) and is part of a southeast–northwest trending magmatic belt. The igneous rocks of this belt were formed during at least two distinct periods.
Mohammad Bameri, Reyhaneh Abbasi, Abdolreza Partabian   +2 more
doaj   +1 more source

Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene [PDF]

, 2011
Stable isotope records of benthic foraminifera from ODP Site 1264 in the southeastern Atlantic Ocean are presented which resolve the latest Oligocene to early Miocene (~24–19 Ma) climate changes at high temporal resolution (<3 kyr).
van de Wal, R.S.W., H. Pälike, Pälike, H., Hodell, D. A., de Boer, B., Lourens, L.J., Lourens, L. J., D. Liebrand, B. de Boer, Wal, R.S.W. van de, L. J. Lourens, De Boer, B.; id_orcid, Hodell, D.A., van de Wal, R. S. W., Liebrand, Diederik, Van De Wal, R. S.W., R. S. W. van de Wal, D. A. Hodell, Liebrand, D., Boer, B. de   +19 more
core   +3 more sources

Provenance Response to Rifting and Separation at the Jan Mayen Microcontinent Margin

Geosciences, 2022
The Eocene-Miocene successions recovered at DSDP sites on the Jan Mayen Ridge (NE Atlantic) and on the adjacent East Greenland margin provide a sedimentary record of the rifting and separation of the Jan Mayen Microcontinent from East Greenland.
Andrew Morton, David W. Jolley, Adam G. Szulc, Andrew G. Whitham, Dominic P. Strogen, C. Mark Fanning, Sidney R. Hemming   +6 more
doaj   +1 more source

Cementation scenarios for New Zealand Cenozoic nontropical limestones [PDF]

, 1996
Cenozoic limestones are widely distributed in New Zealand, especially in the Oligocene-earliest Miocene in both islands, and the Pliocene-Pleistocene in North Island.
Nelson, Campbell S., Hood, Steven D., Campbell S. Nelson, Steven D. Hood   +3 more
core   +1 more source

Geochemical expression of early diagenesis in middle Eocene-lower Oligocene pelagic sediments in the Southern Labrador Sea, Site 647, ODP Leg 105 [PDF]

, 1989
Geochemical analyses of the middle Eocene through lower Oligocene lithologic Unit IIIC (260-518 meters below sea floor [mbsf]) indicate a relatively constant geochemical composition of the detrital fraction throughout this depositional interval at Ocean ...
Kaminski, M., S. Hagerty Reig, Dean, W.E., M.A. Arthur, Arthur, M.A., W.E. Dean, Zachos, J.C., Hagerty Reig, S., K. Elmstrom, Elmstrom, K., M. Kaminski, J.C. Zachos   +11 more
core   +1 more source

Oligocene moisture variations as evidenced by an aeolian dust sequence in Inner Mongolia, China

Scientific Reports, 2022
The aridification of Central Asia since the Eocene has widespread evidence, but climate-controlled environmental reorganizations during the Oligocene remain ambiguous.
Joonas Wasiljeff, Johanna M. Salminen, Jarkko Stenman, Zhaoqun Zhang, Anu Kaakinen   +4 more
doaj   +1 more source

MicroCT reinvestigation of the only articulated fossil anostomid fish reveals synonymy of Arhinolemur Ameghino, 1898 and Megaleporinus Ramirez et al., 2017

The Anatomical Record, EarlyView.
Abstract Arhinolemur scalabrinii† Ameghino, 1898 was originally described as a strepsirrhine primate (Mammalia) but has been recognized as an anostomid fish since 2012. It remains the only extinct anostomid species known from complete cranial material.
Karen M. Panzeri, Humberto L. Andrelino, Sergio Bogan, José P. O'Gorman, Federico Agnolín, Brian L. Sidlauskas, Nahuel Vega, Agustín G. Martinelli, José L. Birindelli   +8 more
wiley   +1 more source

Nomenclatural novelties in the fossil genus Spinopalmoxylon (Arecaceae) from the Central European Oligocene and Miocene: A whole-plant concept for Spinopalmoxylon daemonorops

Acta Palaeobotanica, 2019
The fossil genus Spinopalmoxylon from the Central European Oligocene and Miocene comprises three species: S. daemonorops, S. parvifructum sp. nov. and S. cicatricosum sp. nov. Here the species S.
HEINRICH WINTERSCHEID
doaj   +1 more source

Discriminating cool-water from warm-water carbonates and their diagenetic environments using element geochemistry: the Oligocene Tikorangi Formation (Taranaki Basin) and the dolomite effect [PDF]

, 2004
Fields portrayed within bivariate element plots have been used to distinguish between carbonates formed in warm- (tropical) water and cool- (temperate) water depositional settings.
Nelson, Campbell S., Hood, Steven D., Campbell S. Nelson, Kamp, Peter J.J., Steven D. Hood, Peter J. J. Kamp   +5 more
core   +1 more source

Tracheal chambers as a key innovation for high‐frequency emission in bat echolocation

The Anatomical Record, EarlyView.
Abstract Key innovations are pivotal for biodiversity and facilitating evolutionary success, enabling organisms' adaptation to various ecological niches through the diversification of phenotypic traits. In mammals, notable adaptations include evolving hypsodonty for grazing on grasses and, for bats, evolving echolocation and wing acquisition.
Nicolas L. M. Brualla, Laura A. B. Wilson, Khizar Hayat, Michael Doube, Vuong Tan Tu, Thongchai Ngamprasertwong, Thanakul Wannaprasert, Daisuke Koyabu   +7 more
wiley   +1 more source