scholarly journals A Newly Identified Younger Dryas Component in Eagle Cave, Texas

2021 ◽  
pp. 1-12
Author(s):  
Charles W. Koenig ◽  
J. David Kilby ◽  
Christopher J. Jurgens ◽  
Lorena Becerra-Valdivia ◽  
Christopher W. Ringstaff ◽  
...  

Recent excavations by the Ancient Southwest Texas Project of Texas State University sampled a previously undocumented Younger Dryas component from Eagle Cave in the Lower Pecos Canyonlands of Texas. This stratified assemblage consists of bison (Bison antiquus) bones in association with lithic artifacts and a hearth. Bayesian modeling yields an age of 12,660–12,480 cal BP, and analyses indicate behaviors associated with the processing of a juvenile bison and the manufacture and maintenance of lithic tools. This article presents spatial, faunal, macrobotanical, chronometric, geoarchaeological, and lithic analyses relating to the Younger Dryas component within Eagle Cave. The identification of the Younger Dryas occupation in Eagle Cave should encourage archaeologists to revisit previously excavated rockshelter sites in the Lower Pecos and beyond to evaluate deposits for unrecognized, older occupations.

Radiocarbon ◽  
2014 ◽  
Vol 56 (2) ◽  
pp. 899-912 ◽  
Author(s):  
Philippe Crombé ◽  
Erick Robinson ◽  
Mark van Strydonck

Sum probability and Bayesian modeling of a substantial series of radiocarbon dates from a former extensive lake area in NW Belgium, known as the Moervaart area, allow important hydrological changes to be synchronized with Greenland Interstadial lb (or Intra-Allerød Cold Period). It is postulated that the disappearance of nearly all open water systems (Moervaart lake, anastomosing gullies, and dune-slacks) in response to this short but abrupt cooling event was responsible for a nearly total retreat of hunter-gatherers already some centuries before the start of Greenland Stadial 1 (Younger Dryas).


Radiocarbon ◽  
2014 ◽  
Vol 56 (02) ◽  
pp. 899-912 ◽  
Author(s):  
Philippe Crombé ◽  
Erick Robinson ◽  
Mark van Strydonck

Sum probability and Bayesian modeling of a substantial series of radiocarbon dates from a former extensive lake area in NW Belgium, known as the Moervaart area, allow important hydrological changes to be synchronized with Greenland Interstadial lb (or Intra-Allerød Cold Period). It is postulated that the disappearance of nearly all open water systems (Moervaart lake, anastomosing gullies, and dune-slacks) in response to this short but abrupt cooling event was responsible for a nearly total retreat of hunter-gatherers already some centuries before the start of Greenland Stadial 1 (Younger Dryas).


Author(s):  
Andreas Taller ◽  
Noora Taipale

Backed lithic artifacts are an important part of the Upper Paleolithic tool kit, and are often among the most abundant categories of lithic tools found at Magdalenian and Gravettian sites. Often these tools are exclusively referred to as projectiles, and indeed many – if not most – backed pieces may have been parts of composite projectile heads, mounted laterally onto organic points (e.g., Allain and Descouts 1957; Allain 1979; Abramova 1982; Bergman and Newcomer 1983; Leroi­ Gourhan 1983; Plisson 1985; Nuzhnyi 1993; Christensen and Valentin 2004; Sano 2009; Langlais 2010; Araujo­Igreja 2011; Tomasso et al. 2018). Experiments of varying comprehensiveness concerned with the use of (Magdalenian) backed pieces as projectile inserts have confirmed the effectivity of this setup (e.g., Moss and Newcomer 1982; Pétillon et al. 2011; Gauvrit Roux et al. 2020). However, backed pieces sometimes also served other purposes like cutting, sawing, shaving, scraping or perforating (Moss and Newcomer 1982; Moss 1983; Owen 1988; Piel­Desruisseaux 1998; Christensen and Valentin 2004; Taller et al. 2012). The modular technological system involving these lithic artifacts is highly versatile, mobile and dynamic as there are numerous possibilities of use and as the small lithic inserts are easy to transport and the composite tools themselves are easy to maintain and repair. Here, we present the results of an experiment where different tasks were carried out using backed pieces hafted in a wooden handle or operated handheld. The design of the handles loosely follows examples found at Canadian Dorset sites where bladelets comparable in size to Magdalenian backed pieces were hafted and used as knives (Owen 1988, 88ff.). We tried out the tools in various activities (cutting, perforating and carving/whittling) on a set of worked materials (wood, antler, marine shell, smoked meat, dried, semi­tanned hide, and tanned leather). After the completion of these tasks, the applicability, durability and usefulness of the setup were evaluated and the lithic inserts were checked microscopically for use­wear traces.


Author(s):  
G. G. Hembree ◽  
Luo Chuan Hong ◽  
P.A. Bennett ◽  
J.A. Venables

A new field emission scanning transmission electron microscope has been constructed for the NSF HREM facility at Arizona State University. The microscope is to be used for studies of surfaces, and incorporates several surface-related features, including provision for analysis of secondary and Auger electrons; these electrons are collected through the objective lens from either side of the sample, using the parallelizing action of the magnetic field. This collimates all the low energy electrons, which spiral in the high magnetic field. Given an initial field Bi∼1T, and a final (parallelizing) field Bf∼0.01T, all electrons emerge into a cone of semi-angle θf≤6°. The main practical problem in the way of using this well collimated beam of low energy (0-2keV) electrons is that it is travelling along the path of the (100keV) probing electron beam. To collect and analyze them, they must be deflected off the beam path with minimal effect on the probe position.


Author(s):  
James C.S. Kim

Bovine respiratory diseases cause serious economic loses and present diagnostic difficulties due to the variety of etiologic agents, predisposing conditions, parasites, viruses, bacteria and mycoplasma, and may be multiple or complicated. Several agents which have been isolated from the abnormal lungs are still the subject of controversy and uncertainty. These include adenoviruses, rhinoviruses, syncytial viruses, herpesviruses, picornaviruses, mycoplasma, chlamydiae and Haemophilus somnus.Previously, we have studied four typical cases of bovine pneumonia obtained from the Michigan State University Veterinary Diagnostic Laboratory to elucidate this complex syndrome by electron microscopy. More recently, additional cases examined reveal electron opaque immune deposits which were demonstrable on the alveolar capillary walls, laminae of alveolar capillaries, subenthothelium and interstitium in four out of 10 cases. In other tissue collected, unlike other previous studies, bacterial organisms have been found in association with acute suppurative bronchopneumonia.


Author(s):  
L. S. Chumbley ◽  
M. Meyer ◽  
K. Fredrickson ◽  
F.C. Laabs

The development of a scanning electron microscope (SEM) suitable for instructional purposes has created a large number of outreach opportunities for the Materials Science and Engineering (MSE) Department at Iowa State University. Several collaborative efforts are presently underway with local schools and the Department of Curriculum and Instruction (C&I) at ISU to bring SEM technology into the classroom in a near live-time, interactive manner. The SEM laboratory is shown in Figure 1.Interactions between the laboratory and the classroom use inexpensive digital cameras and shareware called CU-SeeMe, Figure 2. Developed by Cornell University and available over the internet, CUSeeMe provides inexpensive video conferencing capabilities. The software allows video and audio signals from Quikcam™ cameras to be sent and received between computers. A reflector site has been established in the MSE department that allows eight different computers to be interconnected simultaneously. This arrangement allows us to demonstrate SEM principles in the classroom. An Apple Macintosh has been configured to allow the SEM image to be seen using CU-SeeMe.


Author(s):  
L. S. Chumbley ◽  
M. Meyer ◽  
K. Fredrickson ◽  
F.C. Laabs

The Materials Science Department at Iowa State University has developed a laboratory designed to improve instruction in the use of the scanning electron microscope (SEM). The laboratory makes use of a computer network and a series of remote workstations in a classroom setting to provide students with increased hands-on access to the SEM. The laboratory has also been equipped such that distance learning via the internet can be achieved.A view of the laboratory is shown in Figure 1. The laboratory consists of a JEOL 6100 SEM, a Macintosh Quadra computer that acts as a server for the network and controls the energy dispersive spectrometer (EDS), four Macintosh computers that act as remote workstations, and a fifth Macintosh that acts as an internet server. A schematic layout of the classroom is shown in Figure 2. The workstations are connected directly to the SEM to allow joystick and computer control of the microscope. An ethernet connection between the Quadra and the workstations allows students seated there to operate the EDS. Control of the microscope and joystick is passed between the workstations by a switch-box assembly that resides at the microscope console. When the switch-box assembly is activated a direct serial line is established between the specified workstation and the microscope via the SEM’s RS-232.


2020 ◽  
Vol 5 (6) ◽  
pp. 1410-1421
Author(s):  
Erica Ellis ◽  
Mary Kubalanza ◽  
Gabriela Simon-Cereijido ◽  
Ashley Munger ◽  
Allison Sidle Fuligni

Purpose To effectively prepare students to engage in interprofessional practice, a number of Communication Disorders (COMD) programs are designing new courses and creating additional opportunities to develop the interprofessional competencies that will support future student success in health and education-related fields. The ECHO (Educational Community Health Outreach) program is one example of how the Rongxiang Xu College of Health and Human Services at California State University, Los Angeles, has begun to create these opportunities. The ultimate goal of the ECHO project is to increase both access to and continuity of oral health care across communities in the greater Los Angeles area. Method We describe this innovative interdisciplinary training program within the context of current interprofessional education models. First, we describe the program and its development. Second, we describe how COMD students benefit from the training program. Third, we examine how students from other disciplines experience benefits related to interprofessional education and COMD. Fourth, we provide reflections and insights from COMD faculty who participated in the project. Conclusions The ECHO program has great potential for continuing to build innovative clinical training opportunities for students with the inclusion of Child and Family Studies, Public Health, Nursing, and Nutrition departments. These partnerships push beyond the norm of disciplines often used in collaborative efforts in Communication Sciences and Disorders. Additionally, the training students received with ECHO incorporates not only interprofessional education but also relevant and important aspects of diversity and inclusion, as well as strengths-based practices.


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