Geology and taphonomy of a unique tyrannosaurid bonebed from the upper Campanian Kaiparowits Formation of southern Utah: implications for tyrannosaurid gregariousness

Tyrannosaurids are hypothesized to be gregarious, possibly parasocial carnivores engaging in cooperative hunting and extended parental care. A tyrannosaurid (cf. Teratophoneus curriei) bonebed in the late Campanian age Kaiparowits Formation of southern Utah, nicknamed the Rainbows and Unicorns Quarry (RUQ), provides the first opportunity to investigate possible tyrannosaurid gregariousness in a taxon unique to southern Laramidia. Analyses of the site’s sedimentology, fauna, flora, stable isotopes, rare earth elements (REE), charcoal content and taphonomy suggest a complex history starting with the deaths and transport of tyrannosaurids into a peri-fluvial, low-energy lacustrine setting. Isotopic and REE analyses of the fossil material yields a relatively homogeneous signature indicating the assemblage was derived from the same source and represents a fauna living in a single ecospace. Subsequent drying of the lake and fluctuating water tables simultaneously overprinted the bones with pedogenic carbonate and structurally weakened them through wet-dry cycling. Abundant charcoal recovered from the primary bone layer indicate a low temperature fire played a role in the site history, possibly triggering an avulsion that exhumed and reburied skeletal material on the margin of a new channel with minimal transport. Possible causes of mortality and concentration of the tyrannosaurids include cyanobacterial toxicosis, fire, and flooding, the latter being the preferred hypothesis. Comparisons of the RUQ site with other North American tyrannosaur bonebeds (Dry Island-Alberta; Daspletosaurus horneri-Montana) suggest all formed through similar processes. Combined with ichnological evidence, these tyrannosaur mass-burial sites could be part of an emerging pattern throughout Laramidia reflecting innate tyrannosaurid behavior such as habitual gregariousness.

Choose the Right Citrus Rootstock

After the arrival in 2005 of citrus greening disease or Huanglongbing in Florida, making a profitable rootstock decision became more complicated. New rootstocks are being developed and released for commercialization at an accelerated pace. Regardless of these changes, there remains a time-honored framework for selecting rootstocks. This publication provides guidance in 4 aspects of scion selection: site history, objectives, sources of information on rootstocks, and choosing a rootstock that matches site and grower objectives.https://edis.ifas.ufl.edu/hs178 This is a revision, original publication: Castle, William, and James Ferguson. 1. “Considerations for Choosing the Right Rootstocks”. EDIS 2003 (13). https://journals.flvc.org/edis/article/view/108974.

Ombilin Coal Mine Site: History and Potential as a Learning Source for the History of the Economy Based on Outdoor Learning

This study aims to determine the history of the Ombilin Sawahlunto coal mine, the use of this site as a historical learning resource based on outdor learning and the obstacles it faces in its utilization. The method used in this research is qualitative with a descriptive approach. The sources used were interviews, literature and newspapers. After collecting the sources and separating the primary and secondary sources, rewrite them. The research results found that government projects in the city of sawahlunto consist of three projects including first, exploitation of coal mines, second, construction of railways, third, construction of the port of Emmahaven (Teluk Bayur). Traces of Dutch heritage that still exist today are the railway museum, Goedang Ranseum, Mbah Soero Mine Hole, and the Coal Mining Museum. This legacy can be used as a source of historical learning based on outdor learning.

Early Medieval Great Hall Complexes in England: Temporality and Site Biographies

This paper offers a critical reconsideration of the social, spatial and temporal dynamics of sixth- to eighth-century great hall complexes in England. The major interpretative issues and constraints imposed by the data are considered, and the sites are then subject to comparative analysis across long-term and short-term temporal scales. The former highlights persistence of antecedent activity and centrality, the latter the ways in which the built environment was perceived in the past, structured social action, and was a medium for the construction and consolidation of elite identity and authority. Within the broad similarity that defines the site-type there is evidence for considerable diversity and complexity of site history and afterlife.

Early Medieval Great Hall Complexes in England: Temporality and Site Biographies

This paper offers a critical reconsideration of the social, spatial and temporal dynamics of sixth- to eighth-century great hall complexes in England. The major interpretative issues and constraints imposed by the data are considered, and the sites are then subject to comparative analysis across long-term and short-term temporal scales. The former highlights persistence of antecedent activity and centrality, the latter the ways in which the built environment was perceived in the past, structured social action, and was a medium for the construction and consolidation of elite identity and authority. Within the broad similarity that defines the site-type there is evidence for considerable diversity and complexity of site history and afterlife.