Results 71 to 80 of about 32,835 (209)

Domed‐rim microbial polygons and their preservation potential

The Depositional Record, Volume 12, Issue 1, February 2026.
Microbially induced sedimentary structures (MISS) derive through interactions between minerals and microorganisms. We define a domed‐rim MISS, morphologically distinct from abiotic mud cracks and demonstrate its potential for long‐term preservation. These structures represent promising biosignatures in ancient environments on Earth and potentially Mars.
Franziska R. Blattmann, Timothy I. Eglinton, Negar Haghipour, Simon E. Rouwendaal, Stefano M. Bernasconi, John M. Rivers, Maria Dittrich, Zulfa Al Disi, Kenneth H. Williford, Fadhil Sadooni, Hamad A. Al‐Saad Al‐Kuwari, Tomaso R. R. Bontognali   +11 more
wiley   +1 more source

Barchan Slipface Grainflows: Characteristics and Kinematics

Geophysical Research Letters, 2022
Gravity‐driven grainflows on aeolian dunes are important agents of sand transport on Earth and Mars but have been the focus of few field studies. We present results from the first comprehensive field study to evaluate hypotheses posed by previous studies:
Douglas J. Sherman, Pei Zhang, Jon Pelletier, Jean Ellis, Eugene Farrell, Bailiang Li   +5 more
doaj   +1 more source

The regional evolution of a dryland fluvio‐aeolian and lacustrine succession in response to allocyclic forcing: insights from the Early Permian Cutler Group, Utah, USA

Sedimentology, Volume 73, Issue 2, Page 297-354, February 2026.
ABSTRACT Preserved allocyclic signatures in the rock record often reflect basin‐scale climatic variability and serve as key proxies for correlating ancient dryland successions. The notion of climate cyclicity, however, remains largely untested on regionally constrained, outcrop‐calibrated studies.
Oliver Button, Jack G. Connor, Ross P. Pettigrew, Ben A. Kilhams, John A. Howell   +4 more
wiley   +1 more source

Coral Barchan Dunes

Coral barchan dunes ...
宇, 付
core   +1 more source

Protracted intercontinental aridification preserved within the early Late Cretaceous strata of the Eastern Gobi Basin, Mongolia

Sedimentology, Volume 73, Issue 1, Page 147-185, January 2026.
ABSTRACT Mongolia's Eastern and Western Gobi Basins preserve a globally significant record of Cretaceous terrestrial vertebrates, yet their biostratigraphic correlations are complicated by a complex geological history. The Eastern Gobi Basin, a northeast‐southwest trending fault‐bounded rift system, includes several minor sub‐basins with distinct ...
Ryan T. Tucker, Michael Ryan King, Puntsag Delgerzaya, William J. Freimuth, Tsogtbaatar Chinzorig, Khishigjav Tsogtbaatar, Ryuji Takasaki, Mototaka Saneyoshi, Alfio Alessandro Chiarenza, Lindsay E. Zanno   +9 more
wiley   +1 more source

Steady-state migration of barchan dunes: Field evidence from the dynamic equilibrium of sediment flux

International Soil and Water Conservation Research
Barchan dunes migrate downstream while largely preserving their morphology, a process thought to result from a dynamic balance between sediment influx and outflux. However, direct field evidence and the governing mechanism of this balance remain limited.
Yuxin Liu, Xin Gao, Yuanwei Lin, Rui Liu, Xiujie Yu, Yongcheng Zhao, Jiaqiang Lei   +6 more
doaj   +1 more source

Reply to “Comment on ‘Minimal size of a barchan dune’ ”

Physical Review E, 2007
We reply to the comment by Andreotti and Claudin (submitted to Phys. Rev. E, arXiv:0705.3525) on our paper ``Minimal Size of a Barchan Dune'' [Phys. Rev. E {\bf{75,}} 011301 (2007)]. We show that the equations of the dune model used in our calculations are self-consistent and effectively lead to a dependence of the minimal dune size on the wind speed ...
Parteli, E.J.R. (author), Durán, O. (author), Herrmann, H.J. (author)   +2 more
openaire   +3 more sources

Spatial structuring and size selection as collective behaviours in an agent-based model for barchan fields. [PDF]

, 2013
International audienceIn order to test parameters of the peculiar dynamics occurring in barchan fields, and compute statistical analysis over large numbers of dunes, we build and study an agent-based model, which includes the well-known physics of an ...
Hersen, Pascal, Sylvain Courrech du, Pascal Hersen, Guillaume Grégoire, Courrech Du Pont, Sylvain, Génois, Mathieu, Grégoire, Guillaume, Mathieu Génois, Sylvain Pont   +8 more
core   +1 more source

Transient Hydrology in Amazonis Planitia (Mars) in the Aftermath of the Tooting Impact

Journal of Geophysical Research: Planets, Volume 130, Issue 11, November 2025.
Abstract Hydrological flows generated by meteoroid impact are still largely unexplored on Mars and may also have implications for Earth. We reconstructed the hydrological sequence initiated on Mars by a less than 3 Ma old meteoroid impact that formed the 28 km‐wide Tooting crater on Amazonis Planitia, an ice‐bearing region.
Fabio Vittorio De Blasio, Andrea Caccia, Giovanni Battista Crosta   +2 more
wiley   +1 more source

Groundwater Altered Water Balance and Plant Water Use Efficiency in Desert Ecosystems

Water Resources Research, Volume 61, Issue 11, November 2025.
Abstract Groundwater is an important water source in water‐limited desert ecosystem. Less attention has been paid to how the water balance and plant performance in such ecosystems vary with the presence or absence of groundwater. Appropriate replanting strategies play a pivotal role in preventing desertification.
Yicong Nan, Jianqiang Huo, Gaoling Han, Rui Hu, Yang Zhao, Yafeng Zhang, Xiao Lu, Yuanzhen Zhou, Jannis Groh, Zhishan Zhang   +9 more
wiley   +1 more source