Constraining the body mass range of Anzu wyliei using volumetric and extant-scaling methods

The ability to accurately and reliably estimate body mass of extinct taxa is a vital tool for interpreting the physiology and even behavior of long-dead animals. For this reason, paleontologists have developed many possible methods of estimating the body mass of extinct animals, with varying degrees of success. These methods can be divided into two main categories: volumetric mass estimation and extant scaling methods. Each has advantages and disadvantages, which is why, when possible, it is best to perform both, and compare the results to determine what is most plausible within reason. Here we employ volumetric mass estimation (VME) to calculate an approximate body mass for previously described specimens of Anzu wyliei from the Carnegie Museum of Natural History. We also use extant scaling methods to try to obtain a reliable mass estimate for this taxon. In addition, we present the first digital life restoration and convex hull of the dinosaur Anzu wyliei used for mass estimation purposes. We found that the volumetric mass estimation using our digital model was 216-280kg, which falls within the range predicted by extant scaling techniques, while the mass estimate using minimum convex hulls was below the predicted range, between 159-199 kg . The VME method for Anzu wyliei strongly affirms the predictive utility of extant-based scaling. However, volumetric mass estimates are likely more precise because the models are based on comprehensive specimen anatomy rather than regressions of a phylogenetically comprehensive but disparate sample.

Selection for increased cranial capacity in small mammals during a century of urbanization

Urbanization is a selective force that is known to drive changes in the population dynamics of wildlife. How animals adapt to changing environmental conditions is crucial to their survival in these environments. Relative brain size, or cranial capacity, is a known proxy of behavioral flexibility, and can be used to assess how well a species has adapted to a particular environment. We examined changes in cranial capacity in a time series of small mammal skulls collected from urban and rural populations in southwestern Pennsylvania. Skulls from urban populations were collected from Allegheny County, an area that experienced rapid urbanization over the past century, and skulls of rural populations from the Powdermill Nature Reserve of the Carnegie Museum, which has remained relatively unchanged forest over the same period. Our results show that Peromyscus leucopus and Microtus pennsylvanicus from urban populations had significantly greater cranial capacity than their rural counterparts, but the opposite was true for Eptesicus fuscus. We found no difference in relative cranial capacity across time in any of the small mammal species. Our results suggest that a larger cranial capacity is selected for in an urban environment and reinforces the hypothesis that behavioral flexibility is important for animals to adapt to novel environments.

History and geology of the Cope’s Nipple Quarries in Garden Park, Colorado—type locality of giant sauropods in the Upper Jurassic Morrison Formation

The discovery in 1877 of what proved to be an extensive multi-taxa bonebed from the Upper Jurassic Morrison Formation helped kick-start the first Jurassic “Dinosaur Rush.” Located north of Cañon City, Colorado, the site, known today as Cope’s Nipple within the Garden Park National Natural Landmark, was worked by Oramel and Ira Lucas from 1877 to 1884, again by the Carnegie Museum in 1901, and sporadically by the Denver Museum of Natural History from 1991 to 1996. The history of this work is presented in depth for the first time using extensive archival records. The quarries occur in a single horizon around the base of Cope’s Nipple and represents a widespread bonebed in distal overbank silty mudstone that was subsequently modified by pedogenesis. Limited taphonomic data indicate the bonebed was a mix of allochthonous and autochthonous bone.

History and geology of the Cope’s Nipple Quarries in Garden Park, Colorado—type locality of giant sauropods in the Upper Jurassic Morrison Formation

The discovery in 1877 of what proved to be an extensive multi-taxa bonebed from the Upper Jurassic Morrison Formation helped kick-start the first Jurassic “Dinosaur Rush.” Located north of Cañon City, Colorado, the site, known today as Cope’s Nipple within the Garden Park National Natural Landmark, was worked by Oramel and Ira Lucas from 1877 to 1884, again by the Carnegie Museum in 1901, and sporadically by the Denver Museum of Natural History from 1991 to 1996. The history of this work is presented in depth for the first time using extensive archival records. The quarries occur in a single horizon around the base of Cope’s Nipple and represents a widespread bonebed in distal overbank silty mudstone that was subsequently modified by pedogenesis. Limited taphonomic data indicate the bonebed was a mix of allochthonous and autochthonous bone.

20/20: The Studio Museum of Harlem and the Carnegie Museum of Art

Exhibition schedule: Carnegie Museum of Art, July 22–December 31, 2017

A Royal Pain, But Worth It: New Storage for Old Collections

Three years ago, the Section of Anthropology, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA, received a grant from the National Endowment for the Humanities to rehouse its 1.5-million-specimen archaeological collection. The entire Anthropology collection was affected by the movement of the archaeology material, and required additional attention. With a staff of two people, a conservator, and a host of wonderful volunteers and interns, the security and accessibility of the collections were greatly enhanced through the creation of custom housing for a variety of objects, including pottery, textiles, spears, bows and arrows, saddles, etc. This poster shows a sampling of the storage upgrades that resulted from this intense project.

Launching a Risk Assessment Project

In 2017 Carnegie Museum of Natural History (CM) received funding from the Institute for Museum and Library Services (IMLS) to conduct a risk assessment for collections. CM had already conducted two general conservation surveys (1989 and 2010) and an environmental survey (2011), all funded by IMLS. The next logical step was to do a risk assessment. The initial planning was done through the development of a funding proposal. Both the concept and the process had to be supported by administration and staff, which was ensured up front through the development of the grant application. At the time, we were fortunate enough to have a new administration that supported this project as a logical step toward developing a long-term collection care strategy. In the application we identified the most experienced subject matter expert as a consultant (R. R. Waller, Project Heritage Inc.). Waller has a longstanding relationship with CM, having been part of the core team in the general conservation surveys. Waller worked closely with the grant application team to develop the project schedule and internal team. Additionally, the grant application proposed the use of Waller's Cultural Property Risk Analasys Model (CPRAM) to assess our risks. One key element in developing the proposal was the acknowledgment of limited staff time. This was solved by including money to hire a Collections Associate dedicated to the project, full time for the two-year duration of the project. There is a steep learning curve for the process. Having this "gatekeeper" to manage the data being gathered maintains consistencey and focuses adequate staff time to keep the project moving forward. The overall goal of the project is to identify risks to the collections in a quantifiable manner. Using these data we will prioritize those risks and subsequently develop reasonable strategies to reduce the risks. This project will inform the overall strategic plan currently being developed for CM. By strategically including a few non-collection staff in the project, the risk assessment work will also promote better understanding and communication of collection concerns across the museum and our parent organization. This poster examines the initial phase of the two-year project. It demonstrates how we, at CM, are approaching the organization of the CPRAM, training staff, and beginning this complex project.