Michael Page

Survival of the Obscuring Torus in the Most Powerful Active Galactic Nuclei

S.M. acknowledges financial support through grant AYA2016-76730-P. (MINECO/FEDER). F.J.C., X.B., and A.A.-H. acknowledge financial support through grant AYA2015-64346-C2-1-P (MINECO/FEDER). A.H.-C. acknowledges financial support through grants AYA2015-70815-ERC and AYA2012-31277. C.R.A. acknowledges financial support through grant AYA2016-76682-C3-2-P and the Ramon y Cajal Program through project RYC-2014-15779 (MINECO). T.M. is supported by CONACyT Grants 179662, 252531 and UNAM-DGAPA PAPIIT IN104216. Based on observations collected at the European Organization for Astronomical Research in the Southern hemisphere, Chile. Based on observations made with the William Herschel Telescope-operated by the Isaac Newton Group, the Telescopio Nazionale Galileo-operated by the Centro Galileo Galilei, and the Gran Telescopio Canarias installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

First Known Feeding Trace of the Eocene Bottom-Dwelling Fish Notogoneus osculus and Its Paleontological Significance

Background The Green River Formation (early Eocene, about 42–53 Ma) at and near Fossil Butte National Monument in Wyoming, USA, is world famous for its exquisitely preserved freshwater teleost fish in the former Fossil Lake. Nonetheless, trace fossils attributed to fish interacting with the lake bottom are apparently rare, and have not been associated directly with any fish species. Here we interpret the first known feeding and swimming trace fossil of the teleost Notogoneus osculus Cope (Teleostei: Gonorynchidae), which is also represented as a body fossil in the same stratum. Methodology/Principal Findings A standard description of the trace fossil, identified as Undichna cf. U. simplicatas, was augmented by high-resolution digital images and spatial and mathematical analyses, which allowed for detailed interpretations of the anatomy, swimming mode, feeding behavior, and body size of the tracemaker. Our analysis indicates that the tracemaker was about 45 cm long; used its caudal, anal, and pelvic fins (the posterior half of its body) to make the swimming traces; and used a ventrally oriented mouth to make overlapping feeding marks. We hypothesize that the tracemaker was an adult Notogoneus osculus. Conclusions/Significance Our results are the first to link a specific teleost tracemaker with a trace fossil from the Green River Formation, while also interpreting the size and relative age of the tracemaker. The normal feeding and swimming behaviors indicated by the trace fossil indicate temporarily oxygenated benthic conditions in the deepest part of Fossil Lake, counter to most paleoecological interpretations of this deposit. Lastly, our spatial and mathematical analyses significantly update and advance previous approaches to the study of teleost trace fossils.

Digital Atlanta: A collaborative approach to remapping Atlanta's past

This paper brings together scholars from English, History, Archaeology, Library Sciences, and Urban Geography from Georgia State and Emory Universities to discuss our efforts in creating regional synergy around digital projects that explore Atlantas past through digital map collections, geodatabases, spatial history tools and web applications, public-oriented digital publications, and 3D gaming environments.

Modeling the History of the City

Historical atlases and gazetteers have long proved invaluable to scholars examining phenomena with a space-time dynamic. By leveraging geospatial technologies to link spatial features with archive and library collections, historical atlases can be transformed into digital databases and tools for scholars and the public. “Modeling the History of the City” discusses the concept, methods, intended outcomes, and challenges of an ongoing project at Emory University Libraries in remapping early twentieth-century Atlanta.