Results 31 to 40 of about 21,253 (209)

An effective palynological preparation procedure using hydrogen peroxide [PDF]

, 2007
Most pre-Quaternary palynology samples are currently prepared by demineralization of the sediment/sedimentary rock matrix using hydrochloric and hydrofluoric acids (HCl and HF respectively).
Kyffin-Hughes, Jane E., Owens, Bernard, Riding, James   +2 more
core   +2 more sources

Sedimentation and subsidence history of the Lomonosov Ridge [PDF]

, 2006
During the first scientific ocean drilling expedition to the Arctic Ocean (Arctic Coring Expedition [ACEX]; Integrated Ocean Drilling Program Expedition 302), four sites were drilled and cored atop the central part of the Lomonosov Ridge in the Arctic ...
Backman, J., Brinkhuis, H., Clemens, S., Cronin, T., Dickens, G.R., Eynaud, F., Gattacceca, J., Jakobsson, M., Jordan, R.W., Kaminski, M., King, J., Koç, N., Martinez, N.C., Matthiessen, J., McInroy, D., Moore Jr., T.C., Moore, T.C., Moran, K., O'Regan, M., Onodera, J., Pälike, H., Rea, B., Rio, D., Sakamoto, T., Smith, D.C., St. John, K.E.K., Stein, R., Suto, I., Suzuki, N., Takahashi, K., Watanabe, M., Yamamoto, M.   +31 more
core   +3 more sources

Formation of low-T hydrated silicates in modern microbialites from Mexico and implications for microbial fossilization

Frontiers in Earth Science, 2015
Microbialites are organo-sedimentary rocks found in abundance throughout the geological record back to ~3.5 Ga. Interpretations of the biological and environmental conditions under which they formed rely on comparisons with modern microbialites ...
Nina eZeyen, Karim eBenzerara, Jinhua eLi, Alexis eGroleau, Etienne eBalan, Jean-Louis eRobert, Imene eEsteve, Rosaluz eTavera, David eMoreira, Purificacion eLopez-Garcia   +9 more
doaj   +1 more source

Late Glacial vegetation, sedimentation and ice recession chronology in the surroundings of Lake Prossa, central Estonia [PDF]

Estonian Journal of Earth Sciences, 2011
Pollen records from Lake Prossa, located in the Saadjärv Drumlin Field, indicate rather homogeneous pollen spectra in the pre-Allerød period and a thick sediment sequence suggesting high input of mineral matter and erosion.
Kersti Kihno, Leili Saarse, Leeli Amon
doaj   +1 more source

New Brittle Stars (Echinodermata, Ophiuroidea) from the Oligocene of the Mainz Basin, Germany

Taxonomy, 2022
The fossil record of the Ophiuroidea is still patchy, especially in the Cenozoic. Only four species have been described from the entire Oligocene, which is in stark contrast to the present-day diversity counting more than 2000 species.
Ben Thuy, Kai Nungesser, Lea D. Numberger-Thuy   +2 more
doaj   +1 more source

Morphological Biosignatures in Volcanic Rocks – Applications for Life Detection on Mars

Frontiers in Earth Science, 2019
The exploration of Mars is largely based on comparisons with Earth analog environments and processes. The up-coming NASA Mars mission 2020 and ExoMars 2020 has the explicit aim to search for signs of life on Mars.
Magnus Ivarsson, Magnus Ivarsson, Therese Sallstedt, Diana-Thean Carlsson, Diana-Thean Carlsson   +4 more
doaj   +1 more source

Evolution of sedimentary environment at the ZKA01 borehole in the north wing of the Yangtze River Delta since late Quaternary

Dizhi lixue xuebao, 2023
The late Quaternary chronostratigraphic framework and marine transgression have long been research focal points in the Yangtze River Delta. The frequent channel oscillation and river incision in the Yangtze Delta have led to the frequent absence of ...
LIU Xianguang, YANG Jinwei, JIANG Ren, LIANG Feigang, XIA Bin, WANG Ju, HU Li, SUN Fengrui, DONG Junlin   +8 more
doaj   +1 more source

Sub‐Micrometer‐Precision Path Following of Piezo‐Actuated Mobile Robot

Advanced Intelligent Systems, EarlyView.
This article reports on the Holonomic‐Beetle (HB), a palm‐sized robot that achieves sub‐micrometer (sub‐µm) precision path tracking across spatial ranges from 100 µm to 10 mm. Using proportional‐integral‐derivative (PID) control, the HB accurately tracks both complex and straight paths with sub‐µm path errors, surpassing existing robots.
Eiji Kusui, Chihiro Sekine, Taiki Goto, Ryosuke Kinoshita, Yuko Nishimura, Shogen Sekiguchi, Satoshi Ando, Yuto Oishi, Yusuke Matsui, Ohmi Fuchiwaki   +9 more
wiley   +1 more source

Distinguishing the hauterivian-barremian sediments in the Karkinitsko-North-Crimean though (Zakhidno-Оktyabrska area) by microfosills

Мінеральні ресурси України, 2022
According to bio- and lithological methods, we have identified and stratified Lower Cretaceous (Neocomian) deposits from well sections: № 29 and 31, which were drilled on the territory of the Zakhidno-Оktyabrska area of the Karkinitsko-North-Crimean ...
O. A. Shevchuk, L. M. Yakushyn, Yu. B. Dorotyak, D. O. Pustovoitova   +3 more
doaj   +1 more source

A detailed redescription of a skeletally immature ‘Redondasaurus’ suggests ontogenetic transformations in the taxon mirror phytosaurian morphological evolution

The Anatomical Record, EarlyView.
Abstract The study of morphological evolution is fundamentally tied to ontogeny, yet studies of these heterochronic processes in the fossil record are rare. Fossils belonging to an ontogenetic series are difficult to assign to an ontogenetic stage due to inconsistent proxies for skeletal ages, challenging to taxonomically assign due to morphological ...
Erika R. Goldsmith, Michelle R. Stocker
wiley   +1 more source