Results 131 to 140 of about 60,314 (301)

Using synthetic models to understand the detecting ability of ground‐penetrating radar for water‐conducting structures in the bedrock of formerly glaciated site

Near Surface Geophysics, EarlyView.
Abstract Utilizing synthetic models for the interpretation of ground‐penetrating radar (GPR) profiles can aid in the detection of hydrogeological structures by identifying their signatures. In this study, finite difference (FD) forward modelling was used to understand the detection ability of 50 MHz GPR for (1) the quaternary deposit–bedrock contact ...
Annika Katarina Åberg, Salla Eeva, Emilia Koivisto, Susanne Charlotta Åberg, Seija Kultti, Kirsti Korkka‐Niemi   +5 more
wiley   +1 more source

Cenozoic bryozoans from Borneo [PDF]

, 2014
Bryozoans are colonial marine invertebrates with an abundant fossil record ranging from Ordovician to Holocene. They are found particularly in shelf sediments deposited at all palaeolatitudes.
Stratigraphy & paleontology, Di Martino, E., Stratigraphy and paleontology   +2 more
core  

A new fossil species of the extant genus Vicelva from mid‐Cretaceous Kachin amber (Coleoptera: Staphylinidae)

Ecology and Evolution
A new species of the extant staphylinid genus Vicelva Moore & Legner, V. rasilis sp. nov., is reported from mid‐Cretaceous Kachin amber of northern Myanmar.
Yan‐Da Li, Alfred F. Newton, Di‐Ying Huang, Chen‐Yang Cai   +3 more
doaj   +1 more source

The Paleoenvironment of the Ndutu Bed at Olduvai Gorge in the Context of Middle Stone Age Expansion in Eastern Africa: A Multiproxy Approach to Ungulate Analyses From the Victoria Cabrera Site and Dorothy Garrod Site (MIS 5)

International Journal of Osteoarchaeology, EarlyView.
ABSTRACT The study of the Eastern African archaeological record is essential for understanding the origin and evolution of the Middle Stone Age (MSA). However, Olduvai Gorge, one of the primary regions in human evolution studies, has few sites associated with the MSA.
Juan Marín, Iván Ramírez‐Pedraza, David M. Martín‐Perea, Irene Solano‐Megías, Natalia Abellán‐Beltrán, Antonio Rodríguez‐Hidalgo, Agness Gidna, Audax Mabulla, José‐Manuel Maíllo‐Fernández   +8 more
wiley   +1 more source

New 3D Velocity Model (mTAB3D) for Absolute Hypocenter Location in Southern Iberia and the Westernmost Mediterranean

Earth and Space Science
The Trans‐Alboran Shear Zone is one of the most seismically active areas in the westernmost Mediterranean, where a wide variety of tectonic domains have developed within the context of oblique convergence between Eurasia and Africa plates. In this region,
José Luis Sánchez‐Roldán, José A. Álvarez‐Gómez, José J. Martínez‐Díaz, Paula Herrero‐Barbero, Hector Perea, Juan V. Cantavella, Lucía Lozano   +6 more
doaj   +1 more source

Modeled Subsidence of Permafrost Terrain 2025–2050: North‐Central Alaska

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT A large fraction of the Alaska terrain is underlain by regolith that contains excess ice (ice that in volume exceeds the natural pore space). Possible loss of excess ice would lead to ground subsidence, which in turn would disturb and destabilize the ground surface.
Jaakko Putkonen, Hayden Patterson, Robert Chance, Mary Soaper, Anai Caparó Bellido, Aymane Ahajjam, Andrew Wilcox, Sheridan Parker, Timothy Pasch   +8 more
wiley   +1 more source

New observations on the stratigraphy and radiocarbon dates at the Cross Creek site, Opito, Coromandel Peninsula [PDF]

, 2008
This paper re-examines stratigraphy and radiocarbon dates at Cross Creek in Sarah's Gully. Three new radiocarbon dates are presented for Layer 9, the earliest, and previously undated, occupation.
Furey, Louise, Sewell, Brenda, Green, Roger, Petchey, Fiona   +3 more
core  

Disposition Model for Permafrost Degradation in Mountainous Regions

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Permafrost is a widespread thermal phenomenon in Arctic and high mountain regions that, in combination with steep terrain, exerts a key control on slope stability. Its degradation in response to climatic warming can modify the likelihood and timing of rockfall, debris flow and related mass movements. Robust information on the current state and
Peter Mani, Simon Allen, Mathias Bavay, Nils Hählen, Markus Stoffel   +4 more
wiley   +1 more source

Integrated stratigraphy, astronomical dating and proxy records of the Ain el Beida and Loulja sections (NW Morocco). Implications for regional climate change, glacial history and the Messinian Salinity Crisis. Geologica Ultraiectina (324) [PDF]

, 2010
This Ph.D. thesis aims to provide a better understanding of the origin of sedimentary colour cycles in the Bou Regreg area in NW Morocco. Sediments were deposited during the late Miocene and early Pliocene at times that the Mediterranean was isolated ...
van der Laan, E., Universiteit Utrecht, Stratigraphy and paleontology   +2 more
core  

Evaluating Testability of Permafrost Models Through Physical and Thermal Testing in Complex Mountain Terrain, Yukon, Canada

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Due to its subsurface nature, permafrost cannot be directly observed with the naked eye or optical remote sensing. Consequently, accurately describing its distribution and thermal state is challenging. This is especially true in vast, remote environments, where obtaining comprehensive field data is demanding or improbable.
Ria Nicholson, Philip P. Bonnaventure, Nick C. Noad, Madeleine C. Garibaldi, Rabecca Thiessen, Will Kochtitzky   +5 more
wiley   +1 more source