Integrated calcareous nannofossil biostratigraphy and magnetostratigraphy from the uppermost marine Eocene deposits of the southeastern Pyrenean foreland basin : evidences for marine Priabonian deposition

An integrated magneto-biostratigraphic study, based on calcareous nannofossils, was carried out on the Eocene uppermost marine deposits of the southeastern Pyrenean foreland basin. The study was performed along six sections of the upper portion of Igualada Formation, cropping out in the Vic area. Common late Middle/Upper Eocene nannofossil assemblages allow recognizing, within a normal magnetozone or immediately below, the FO of Istmolithus recurvus, which identifies the base of NP19 Zone, in the Priabonian. This event occurs within C16n.2n magnetozone in several oceanic and Mediterranean sections, which allows the correlation of the normal magnetozone in the Vic area to chron C16n.2n. This challenges previous magnetostratigraphic interpretations in the Vic area that correlated the uppermost marine sediments to chron C17n. The estimated age for the FO of I. recurvus is 36 Ma and collectively with the magnetostratigraphic data indicates that the uppermost marine sediments in the basin are of Priabonian age. The new results indicate that the entire chronology of the marine strata needs reassessment. The thickness of chron C16n.2n varies from 45 m in the Collsuspina area (southern sector) to about 270-290 m in the Sant Bartomeu del Grau area (northern sector), which is indicative of a marked asymmetry in the basin deposition

The sociolinguistic situation of the British and the US American communities in Spain

This report is concerned with the sociolinguistic situation of the British and US American communities living in Spain. The data used to compile it were drawn from speech data collected during the course of a project financed by the Spanish Comisión Interministerial de Ciencia y Tecnología on the sociolinguistic and psycholinguistic aspects of migrated speech communities and language minority groups in Spain (SEC93-0725), of which the British and the US American communities were two of the twenty-four investigated

Datos paleomagnéticos del sustrato rocoso de la isla de Livingston (Península Antártica): implicaciones tectónicas en la evolución neógena

Se presentan resultados paleomagnéticos de la Fo rmación Miers Bluff y de los diques terciarios y andesitas de la Isla de Livingston (Islas Shetland del Sur, Península A n t á rtica). La mayoría de las rocas estudiadas son portadoras de magnetización estable, que reside en una fase de baja coercividad, probablemente Ti-Magnetita. La restitución tectónica progresiva de las direcciones de magnetización remanente característica revela que la magnetización en las turbiditas de la Fm. Miers Bluff fue adquirida después del plegamiento. Las direcciones medias de los diques y de la Fm. Miers Bluff no ofrecen una diferencia significativa, sugiriendo una misma edad para la magnetización. Se propone que el origen de la misma es una remagnetización de edad terciaria. Asimismo, la posición de los polos paleomagnéticos obtenidos sugiere un basculamiento tectónico que estaría relacionado con la apertura y extensión en el Estrecho de Bransfield.We report paleomagnetic results from the Miers Bluff Formation and Tertiary dykes and andesites in Livingston Island (South Shetland Islands, Antarctic Peninsula). Most of the samples carry stable magnetization, residing in a low coercivity phase, most likely (Ti)magnetite. Progressive untilting of the Characteristic Remanent Magnetization directions reveals that the magnetization of the turbidites (Miers Bluff Fm.) is post-folding. Miers Bluff and the dyke mean directions do not show any significant difference, suggesting the same magnetization age. Thus, a local Cenozoic remagnetization is proposed. Also, the paleomagnetic poles suggest a tectonic tilting that would explain the observed discrepancies between the produced paleopoles and the APWP for the Antarctic Peninsula

Factors of Concern Regarding Zika and Other Aedes aegypti-Transmitted Viruses in the United States

The recent explosive outbreaks of Zika and chikungunya throughout the Americas has raised concerns about the threats that these and similar diseases may pose to the United States (U.S.). The commonly accepted association between tropical climates and the endemicity of these diseases has led to concerns about the possibility of their redistribution due to climate change and transmission arising from cases imported from endemic regions initiating outbreaks in the United States. While such possibilities are indeed well founded, the analysis of historical records not only confirms the potential critical role of traveling and globalization but also reveals that the climate in the United States currently is suitable for local transmission of these viruses. Thus, the main factors preventing these diseases from occurring in the United States today are more likely socioeconomic such as lifestyle, housing infrastructure, and good sanitation. As long as such conditions are maintained, it seems unlikely that local transmission will occur to any great degree, particularly in the northern states. Indeed, a contributing factor to explain the current endemicity of these diseases in less-developed American countries may be well explained by socioeconomic and some lifestyle characteristics in such countries