Results 41 to 50 of about 2,028 (168)

New partial skeleton of Homo habilis from the upper Burgi Member, Koobi Fora Formation, Ileret, Kenya

The Anatomical Record, Volume 309, Issue 3, Page 485-545, March 2026.
Abstract KNM‐ER 64061 is a partial skeleton from the upper Burgi Member of the Koobi Fora Formation (2.02–2.06 Ma) associated taphonomically and geochemically with a nearly complete mandibular dentition (KNM‐ER 64060) attributed to Homo habilis.
Frederick E. Grine, Deming Yang, Ashley S. Hammond, William L. Jungers, Michael R. Lague, Carrie S. Mongle, Osbjorn M. Pearson, Meave G. Leakey, Louise N. Leakey   +8 more
wiley   +1 more source

The Neolithic Site of Piano dei Cardoni in the Island of Ustica (Italy): Minero‐Petrographic and Chemical Characterization of the Ceramic Finds and Clayey Raw Materials

Geoarchaeology, Volume 41, Issue 2, March/April 2026.
ABSTRACT This paper presents the results of minero‐petrographic and chemical analyses of pottery and potential local raw materials from Ustica, a small volcanic island off the coast of Palermo (Sicily), inhabited during the Middle Neolithic. Typologically, the pottery shows cultural connections to the Bicromica and Serra d'Alto traditions, linking ...
G. Montana, C. Speciale, G. Battaglia, L. Randazzo, G. Carnevale, M. V. Antonopoulou, A. Magrì   +6 more
wiley   +1 more source

Barite from the Upper Idrijca River valley (W Slovenia)

Geologija, 2002
The Carnian – Julian beds exposed at the Tratnik landslide location in the Upper Idrijca River valley are of various lithology. Mudstones, shales and fine-grained sandtones prevail, containing lenses of micritic limestone and quartz conglomerate.
Jože Čar, Meta Dobnikar, Dragomir Skaberne   +2 more
doaj  

Geological Characteristics, Distribution Patterns and Genesis Analysis of Hydrothermal Barite Deposits in Kaili Area, Guizhou Province

Kuangchan zonghe liyong
[Objective] The Kaili Area in Guizhou Province, as one of the main distribution areas of hydrothermal barite deposits in Guizhou, has significant economic value and scientific research significance for its hydrothermal barite deposits. However, there are
Xigui ZHANG, Sheng DAI, Shanli HE, Qingpeng SHI   +3 more
doaj   +1 more source

Borehole Logging Lithological Classification in Carbonatite‐Hosted Niobium Deposit Integrating Geophysical and Geochemical Data With Self‐Organizing Maps

Geophysical Prospecting, Volume 74, Issue 3, March 2026.
ABSTRACT Lithological classification from borehole data remains challenging in geologically complex alkaline–carbonatite systems, where compositional overlap and gradual transitions between lithotypes limit conventional interpretation methods. This study presents an integrated and automated workflow for drill‐core lithological classification using self‐
Fabrizzio R. Costa, Lívia Namie S. Nishimura, Reginaldo Antonio R. Filho, Bruno P. Milanezi, Dong Yaosong, Cleyton de C. Carneiro, Carina Ulsen   +6 more
wiley   +1 more source

Barium and its Importance as an Indicator of (Paleo)Productivity

Anais da Academia Brasileira de Ciências
Barium (Ba) is a trace element which occurs predominantly as barite mineral (BaSO4) in the marine environment. Previous work suggests that barite concentrations are related to the organic carbon flux and marine biological debris in the water column ...
BIANCA T.P. LIGUORI, MARCELO G. DE ALMEIDA, CARLOS E. DE REZENDE   +2 more
doaj   +1 more source

Characterization and Testing of Saudi Barite for Potential Use in Drilling Operations

Journal of King Saud University: Engineering Sciences, 2001
There are huge drilling operations in most areas of the Kingdom of Saudi Arabia nowadays searching for potential hydrocarbon reservoirs. While drilling for oil and gas, formations of high pore fluid pressure may be encountered (up to 20 ppg equivalent ...
Musaed N.J. Al-Awad, Ahmad O. Al-Qasabi
doaj   +1 more source

Injecting nerves with radiological contrast as a novel method of studying the peripheral nervous system

Journal of Anatomy, Volume 248, Issue 3, Page 490-500, March 2026.
We present a method of injecting peripheral nerves with radiopaque contrast and subsequent CT scanning that produces excellent 3D models of the nerves, leaving the specimens intact and ready for further analysis (e.g., for micro‐CT or histology). Abstract The peripheral nervous system has been the subject of various studies on topics ranging from the ...
Radosław Rzepliński, Steven T. Proulx, Magdalena Kwiatkowska, Krzysztof Wojtas, Bogdan Ciszek   +4 more
wiley   +1 more source

Experimental investigation on barite sag under flowing condition and drill pipe rotation

Journal of Petroleum Exploration and Production Technology, 2020
Using drilling fluids with optimum density is one of the most important approaches to stabilize the pressure of the bottom formation and prevent blowout through the drilling process.
Saeed Zaker, Pegah Sarafzadeh, Amin Ahmadi, Seyyed Hamid Esmaeili-Faraj, Roohollah Parvizi   +4 more
doaj   +1 more source

Apatite in Bennu samples indicates multiple stages of aqueous alteration

Meteoritics &Planetary Science, Volume 61, Issue 3, Page 504-521, March 2026.
Abstract Calcium phosphates are ubiquitous in planetary materials, including samples returned from asteroid Bennu by the OSIRIS‐REx mission. We characterized apatite [Ca5(PO4)3(F,Cl,OH)] grains in Bennu samples by scanning electron microscopy, electron microprobe analysis, and transmission electron microscopy to investigate their compositions, mineral ...
Laura B. Seifert, T. M. Erickson, L. P. Keller, J. J. Barnes, K. Thomas‐Keprta, L. Le, J. Gorce, Z. Rahman, T. J. Zega, H. C. Connolly Jr, D. S. Lauretta   +10 more
wiley   +1 more source