miércoles, septiembre 11, 2019

Nuevas contribuciones a la paleobiodiversidad de dinosaurios terópodos del Jurásico y Cretácico de España a partir de dientes aislados



El pasado martes 10 a las 11.30 horas el aragosaurero Antonio Alonso Germán Ha defendido su tesis doctoral titulada “Nuevas contribuciones a la paleobiodiversidad de dinosaurios terópodos del Jurásico y Cretácico a partir de dientes aislados”. En este trabajo ha presentado los resultados en sus investigaciones sobre el registro de dientes aislados de dinosaurios terópodos en varios yacimientos del Jurásico Superior y el Cretácico Inferior de la cordillera cantábrica y la cordillera ibérica. Ha obtenido la máxima calificación de Sobresaliente con mención europeo

Los dinosaurios terópodos incluyen a todos los dinosaurios carnívoros estrictos. Su estudio es fundamental para el conocimiento de las complejas relaciones de los organismos terrestres mesozoicos y para reconstruir una parte fundamental en la historia evolutiva de los dinosaurios que aún perduran, las aves. En esta tesis se estudian los dientes aislados de dinosaurios terópodos de yacimientos del Jurásico Superior y el Cretácico Inferior de España. Los restos del Jurásico Superior, del Kimmeridgiense, provienen de la llamada “costa de los dinosaurios” en la comunidad de Asturias.

Los dientes aislados del Cretácico Inferior provienen de la Cordillera Ibérica, de yacimientos localizados en la provincia de Teruel (Aragón): La Cantalera 1, situado en el entorno de Josa, y Barranco del Hocino 1, un yacimiento descubierto recientemente en el término municipal de Estercuel. También se ha estudiado la asociación de un yacimiento de la provincia de Burgos, El Oterillo II, en el entorno de Salas de los Infantes. Mediante el estudio de caracteres cualitativos y cuantitativos, junto con el apoyo de análisis estadísticos y cladísticos se ha identificado la paleobiodiversidad de dinosaurios terópodos, se discuten sus posibles afinidades y distribución y se analizan otras evidencias de su actividad como el posible aprovechamiento de la carcasa de un saurópodo que presenta marcas de dientes.

lunes, agosto 26, 2019

Primeras cáscaras de huevo del Pleistoceno de Atapuerca

Los aragosaureros Carmen Núñez Lahuerta y Gloria Cuenca Bescós, de la Universidad de Zaragoza, y Miguel Moreno Azanza, de la Universidade Nova de Lisboa/Museu de Lourinhã, acaban de publicar un artículo sobre cáscaras de huevos en la Gran Dolina de Atapuerca en la revista Historical Biology. Este trabajo representa el primer análisis de este tipo de restos en los yacimientos de la Sierra de Atapuerca. 

Las cáscaras de huevo analizadas en este trabajo fueron recuperadas gracias al trabajo de lavado y tamizado de sedimentos que el equipo de la Universidad de Zaragoza, liderado por Gloria Cuenca, lleva a cabo todos los años en Atapuerca, de forma simultánea a la excavación de los yacimientos.  Veintidós fragmentos de cáscaras se recuperaron en sedimentos procedentes del nivel TD.6 de la Gran Dolina, de edad Pleistoceno Inferior. El nivel TD.6 es además conocido ya que es ahí donde se recuperaron los restos de Homo antecessor, la única especie humana descrita en la península ibérica. 

Los fragmentos de cáscaras fueron analizados con ayuda de microscopía electrónica y petrográfica y su estudio ha permitido asignarlas a tres grupos diferentes. Se han encontrado  fragmentos correspondientes a huevos de patos u ocas (Anseriformes), de gruidos (Gruidae) y de caradriformes (Charadriiiformes). La asociación refleja la presencia de cuerpos de agua cercanos al yacimiento en el momento de depósito del nivel TD.6. 

Este trabajo pone de manifiesto el potencial de los restos de cáscaras a la hora de realizar reconstrucciones paleoambientales. Esperamos que sea el primero de muchos sobre cáscaras de huevos en yacimientos del Cuaternario!

Aquí la referencia completa:
Núñez-Lahuerta, C., Moreno Azanza, M., Cuenca-Bescós, G. 2019. Avian eggshell remains in the human bearing level TD6 of the Gran Dolina site (Early Pleistocene, Atapuerca, Spain). Historical Biology. https://doi.org/10.1080/08912963.2019.1655009 

martes, agosto 20, 2019

Los primeros océanos: no tan calientes como se pensaba


El cálculo de la temperatura de los océanos primitivos (se han sugerido temperaturas de hasta 70°C) se basa en el incremento progresivo de la proporción del isótopo de oxígeno estable más común en la Tierra (oxígeno 18) en los sedimentos de origen marino acumulados en los últimos 3500 millones de años. Sin embargo, en el artículo publicado en la revista Science se sugiere que esta variación también se puede explicar no por la influencia de la temperatura, sino por el aumento progresivo de la proporción de oxígeno 18 presente en la superficie terrestre y en el agua de mar a lo largo del tiempo. 

El trabajo en concreto muestra que la proporción de oxígeno 18 presente en los óxidos de hierro de origen marino ha ido incrementando en los últimos 2000 millones de años. Como los experimentos de precipitación de óxido de hierro revelan que la proporción de los diferentes isótopos de oxígeno en este mineral depende poco de la temperatura del agua marina, la causa principal del aumento a largo plazo de los valores de oxígeno 18 en las rocas depositadas en los mares pudo ser debida a un aumento progresivo de su proporción de en el agua de mar a lo largo del tiempo, más que al enfriamiento de los océanos. El progresivo enriquecimiento en oxígeno 18 puede haber sido debido a un aumento en la cubierta de sedimentos terrestres, un cambio en la proporción de alteración de las rocas de la corteza de alta y baja temperatura, o una combinación de estos y otros factores.

Para realizar este estudio, se analizaron muestras con óxidos de hierro de diferentes periodos geológicos, incluyendo las calizas con ooides ferruginosos presentes en la denominada “Capa de Arroyofrío” que marca el límite Jurásico Medio-Superior (hace unos 160 millones de años) de la Cordillera Ibérica.  Según Marcos Aurell, catedrático de Estratigrafía de la Universidad de Zaragoza y miembro del Grupo Aragosaurus: recursos geológicos y paleoambientales, “la participación en este trabajo de investigación pone de relieve la relevancia de los estudios locales para entender aspectos clave en la evolución global de nuestro planeta”.

Referencia del artículo https://science.sciencemag.org/content/365/6452/469


Galili, N., Shemesh, A., Yam, R., Brailovsky, I., Sela-Adler, M., Schuster, E.M., Collom, C., Bekker, A. Planavsky, N., Macdonald, F.A., Préat, A. Rudmin, M., Trela, W., Sturesson, U., Heikoop, J.M., Aurell, M., Ramajo, J. Halevy, I. (2019). The geologic history of seawater oxygen isotopes from marine iron oxides. Science 365, 469–473.



Aspecto general y de detalle de las calizas ricas en partículas esféricas (ooides) ferruginosas, que se encuentran en torno al límite Jurásico Medio-Superior (Capa de Arroyofrío) en el entorno de la Sima de San Pedro (Oliete, Teruel)

jueves, julio 25, 2019

Postdoc in Quantitative Paleobiology


The Department of Earth and Atmospheric Sciences at Indiana University seeks a postdoctoral researcher in any area of quantitative paleobiology or paleoecology, including but not limited to phylogenetics, morphometrics, stratigraphic paleobiology, conservation paleobiology, or ecometrics, with preference for someone with research interests in marine invertebrates from the Paleozoic or Mesozoic. The successful candidate will have a good publication record; be prepared to carry out an independent research program; be able to assist with occasional teaching, including up to one graduate or upper division course in quantitative paleobiology; be interested in collaborative research; and participate in mentoring graduate students in IU's geobiology group.

The appointment is for 2 years, with the possibility of renewal up to 4 years based on performance evaluation. The minimum qualifications are a Ph.D. in paleobiology or other relevant field and a strong track record of independent research. Interested candidates should review the application requirements and submit applications at: https://indiana.peopleadmin.com/postings/8148. Questions regarding the position can be directed to Professor David Polly (pdpolly@indiana.edu). Applications received by September 1, 2019, will receive full consideration, but the search will remain open until the position is filled. The expected start date is January 1, 2020.

miércoles, julio 17, 2019

PhD position on Size reductions during hyperthermal events

We seek a motivated and talented graduate student for a PhD position in the DFG founded project on “Size reductions during hyperthermal events: Early warnings of environmental deterioration or signs of extinction?”. The position is temporary for 36 months (TV-L E13, 75%) and is anticipated to start in Oktober 2019. Place of work is the GeoZentrum Nordbayern, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen.

This project is one of eight new projects embedded in the successful prolongation of the interdisciplinary Research Unit FOR 2332 TERSANE: Temperature-Related Stresses as a Unifying Principle in Ancient Extinctions. The research unit combines high-resolution geological field studies with meta-analyses, physiological studies and sophisticated analysis of fossil occurrence data on ancient hyperthermal events to reveal the rate and magnitude of warming, potential causes, impact on marine life, and the mechanisms which led to ecological change and extinction. Geochemistry, analytical paleobiology and physiology comprise our main toolkits. More information on Tersane is available at: http://tersane.palaeobiology.de/


Tasks: The successful candidate will focus on paleobiological – ecological analysis of Pliensbachian-Toarcian and Permian-Triassic mollusks and brachiopods but also be involved in meta-analyses of stratigraphic and paleoenvironmental controls on size and morphology of Phanerozoic invertebrates more generally. The project will largely focus on previously collected data in high-stratigraphic resolution, but will include supplementary field work to cover within- and between facies differences before and across extinct events. Statistical analyses should be carried out, in particular in view of body size distribution and in relationship with environmental perturbations, extinction and facies changes (stratigraphic paleobiology). Fieldwork and analyses occur in connection with other projects within the Research Unit. Applicants are expected to participate in weekly informal seminar, annual workshops and international summer schools with others members of the research unit.

Qualifications:
Mandatory requirements are
M.Sc. degree in geology or biology
Experience in fieldwork
 High degree of initiative and motivation
 Ability to work as part of a team
Very good English skills
Good knowledge of statistics and R programming
Desirable are
Background in invertebrate palaeontology
Driving license

Please submit your application as a single pdf (including curriculum vitae, list of publications, statement of research interests; keyword "EarlyWarn") by the 14th of August 2019 to kenneth.debaets@fau.de

Full-time Senior Paleontologist

Location: Pasadena, CA
Applied EarthWorks, Inc. (Æ) has an immediate opening a full-time Senior Paleontologist / Project Manager in our Pasadena, CA office. The Senior Paleontologist / PM will identify paleontological services needed for specific projects, discussing these services with Æ’s Paleontology Program Manager and clients; recognize staffing needs and collaborate with Æ’s Paleontology Supervisor; and prepare scopes of work, cost proposals, and schedules for services. The successful candidate also will assist with business development and marketing Æ’s paleontology services.

http://www.appliedearthworks.com/senior-paleontologist


DUTIES:
Typical job duties will include: oversee technical specifications and ensure the accuracy and timeliness of teams executing work; prepare scopes of work and budgets to ensure they properly align services with project needs and meet/exceed best management practices; prepare or review technical reports, management plans, and other compliance documents prepared by junior staff; oversee proactive tracking and oversight of project status, resourcing and priorities for projects; and assist all members/roles in prioritizing workflow.


SKILL REQUIREMENTS:
Comprehensive understanding of geology, paleontology, biology, paleoecology, stratigraphy, and biostratigraphy.
Ability to identify regulatory compliance needs based on project descriptions, regulatory context, and construction design.
Experience writing technical reports, management plans, and other documents at all levels of compliance.
Strong written and verbal communication skills with clients and staff.


EDUCATION AND EXPERIENCE:
Must meet the Society of Vertebrate Paleontologists (SVP) qualifications for Principal Investigator/Project Paleontologist. Candidates must have:
M.A. or Ph.D. degree in paleontology or geology and/or a publication record in peer-reviewed journals.
Demonstrated competence in field techniques, preparation, identification, curation, and reporting in California.
At least two full years of professional experience as assistant to a Project Paleontologist with administration and project management experience, as supported by a list of projects and referral contacts.
Proficient in recognizing fossils in the field and determining their significance. Expertise in western geology, stratigraphy, and biostratigraphy. Experience in field collection and laboratory processing of fossils, preferably a range of biota.
Preference will be given to candidates with prior paleontological and project management experience in an environmental compliance setting, including successful authorship of past CEQA and/or NEPA documents, in Southern California.

HOW TO APPLY:
Interested applicants may submit a letter of interest, resume/curriculum vitae, a technical writing sample and list of three professional references to Human Resources at info@appliedearthworks.com. Please reference “Senior Paleontologist” in the subject line. No phone calls please.

viernes, julio 05, 2019

Collections Manager – Invertebrate Paleontology

The University of Kansas Biodiversity Institute seeks a collection manager to oversee its world-class research collections in invertebrate paleontology.  The collections consist of extensive invertebrate fossil and micro-fossil specimens, along with archives and library holdings.  The collections have strengths in Cambrian, Carboniferous and Cretaceous fossils, microfossils, echinoderms, brachiopods, and arthropods, and fossils from Antarctica.  University curators and students, and national and international scholars, use the collections extensively for research and education.  The collection manager is responsible for day-to-day activities in the collection and reports to the curator-in-charge.  This is a full-time (12-month appointment), non-tenure track position.

Duties include:

·         Collection management and conservation of the various collections.
·         Acquisition and collection development in conjunction with curators and students.
·         Museum operational service including day-to-day care and use of the collections.
·         Continue development and enhancement of collection database.
·         Supervision and training of graduate and undergraduate research assistants and students, and volunteers.
·         Professional development to maintain currency in and advance the field.
·         Other duties as appropriate.
Required qualifications include:

·         Master's degree or Ph.D. in museum studies, geology, systematics, or paleontology from an accredited university, or a bachelor’s degree plus 5 years experience working with museum collections in a position with similar responsibilities.
·         Working knowledge of the taxonomy and identification of invertebrate fossils.
·         Demonstrable knowledge of care and management of natural history collections.
·         Familiarity with biodiversity informatics.
And preference will be given to applicants with:

·         Expertise in one or more taxa that constitute divisional strengths and programmatic priorities.
·         Field experience collecting invertebrate fossil specimens.
·         Experience preparing invertebrate fossil specimens.
A complete application will include (1) a letter of application addressing qualifications, (2) CV, (3) statement of collection management philosophy, (4) names and email address of three individuals who can write a letter of recommendation, and (5) representative publications (the latter is optional). More information and a complete position description may be obtained by contacting:

·         Bruce S. Lieberman, Biodiversity Institute, Division of Invertebrate Paleontology, Senior Curator, blieber@ku.edu
·         Jaime Keeler, Biodiversity Institute Business Coordinator, jrkeeler@ku.edu


Application review begins 3 September 2019.  EO/AA.  We celebrate diversity in all life forms and minorities, women, veterans and those with disabilities are strongly encouraged to apply. The University of Kansas values candidates who have experience working with students from diverse backgrounds and possess a strong commitment to improving access to higher education for historically under-represented minorities. ​

To apply go to: http://employment.ku.edu/staff/14823BR

The Paleontological Society seeks to support undergraduate students interested in a career in paleontology who plan to attend the Geological Society of America meeting

The Paleontological Society seeks to support undergraduate students interested in a career in paleontology who plan to attend the 2019 Geological Society of America meeting in Phoenix, Arizona (Sept 21-25, 2019).

A limited number of grants are available to offset travel costs: $1,000 if the undergraduate is presenting original research at GSA and $500 if the undergraduate is just attending the meeting.

In addition to travel support, students will participate in mentoring opportunities with professional paleontologists and graduate students while at the meeting and receive a free 1‐year student membership to the Paleontological Society

In exchange, PS‐SAP students will be expected to volunteer at the PS booth for at least 5 hours during the meeting, and to use social media (e.g., blogs, Facebook, Twitter) to communicate to the Society about their experience at the meeting. In this way, students will serve as “ambassadors” for the Society.

To be eligible, students must be enrolled as an undergraduate student at an institution of higher education, have a stated interest in learning more about careers in paleontology, and be willing to use social media to promote PS activities at the conference. Students with diverse backgrounds (including race, ethnicity, gender, sexuality, neurodiversity, accessibility, first-generation college, etc.) are encouraged to apply.

All documents must be received by Thursday, August 1, 2019.

For more info, please see:
https://paleosoc.org/students/paleontological-society-student-ambassador-program/