The life and times of the olenid trilobites

The Middle Cambrian of Bohemia contains a widespread fauna which can be traced from eastern Newfoundland, through central Britain, Scandinavia and the Montagne Noire in France and further east. Whereas the upper Cambrian (Furongian) in Bohemia consists of volcanics and alluvial sediments, in the Scandinavian (Baltica) and Avalonian successions, dysoxic facies prevail, dominated by the olenid trilobites. The Furongian of southern Sweden forms a superb natural laboratory for studying processes and patterns of evolution in the olenids. The rapid turnover of species and superb preservation of the fossils allows evolutionary changes to be assessed stratophenetically, and at the microevolutionary scale. Also, the dynamics of the evolving faunas can be assessed and their relations with environmental fluctuations established by bed-by-bed collecting and analysis. Moreover since all trilobite growth stages often occur along with the adults, it is possible to establish the complete or partial ontogeny of many species, and to explore the relationhips between ontogeny and phylogeny. Information gained from various lines of evidence from the faunas can be used, along with geochemical approaches to build up a coherent picture of an extinct environment and its inhabitants; this paper summarises old and new explorations in this field

Form, Function and Palaeobiology: preface

Prefacio al número especial de Earth & Environmental Science Transactions of The Royal Society of Edinburgh que compila las presentaciones del simposio ‘‘Form, Function and Palaeobiology’, en el marco del IV Congreso Internacional de Paleontología.Facultad de Ciencias Naturales y Muse

Low-temperature zircon growth related to hydrothermal alteration of siderite concretions in Mississippian shales, Scotland

Zircon occurs in voids and cracks in phosphatic coprolites enclosed in siderite concretions in Mississippian shales near Edinburgh, Scotland. The zircon formed during hydrothermal alteration of early-diagenetic concretions and occurs as spherical aggregates of prismatic crystals, sometimes radiating. Vitrinite reflectance measurements indicate temperatures of ~270°C for the zircon-bearing concretions and the host shales. Molecular parameter values based on dibenzothiophene and phenanthrene distribution and occurrence of di- and tetra-hydro-products of polycyclic aromatic compounds suggest that the rocks experienced relatively high-temperature aqueous conditions related to hydrothermal fluids, perhaps associated with neighboring mafic intrusions. The zircon was dissolved from the concretions, transported in fluids, and reprecipitated in voids. This is the first record of the precipitation of authigenic zircon in sedimentary rock as a new phase, not as outgrowths

The Eyes of Bohemian Trilobites

There are trilobites of the Bohemian area, which belong to the best preserved in the world. Their compound eyes were first studied in detail by Hawle and Corda in 1847, but especially by Barrande (1852, 1872), whose original observations are still of great value. More recently both holochroal and schizochroal eyes have been documented from Bohemian material, their visual fields plotted, growth geometry established, and thin-sections and polished surfaces used for determining the internal structure of the lenses. Modern physiological methods have great potential for determining the nature of the light environment to which even extinct animals were adapted, and thus have an important bearing on their ecology. The use of the eye parameter, which can be determined from the diameter and angle between adjacent lenses is discussed here. This approach, along with further detailed structural investigations should allow many new insights to accrue over the next few years

Form, Function and Palaeobiology: preface

Prefacio al número especial de Earth & Environmental Science Transactions of The Royal Society of Edinburgh que compila las presentaciones del simposio ‘‘Form, Function and Palaeobiology’, en el marco del IV Congreso Internacional de Paleontología.Facultad de Ciencias Naturales y Muse

Low-temperature zircon growth related to hydrothermal alteration of siderite concretions in Mississippian shales, Scotland

Zircon occurs in voids and cracks in phosphatic coprolites enclosed in siderite concretions in Mississippian shales near Edinburgh, Scotland. The zircon formed during hydrothermal alteration of early-diagenetic concretions and occurs as spherical aggregates of prismatic crystals, sometimes radiating. Vitrinite reflectance measurements indicate temperatures of ~270°C for the zircon-bearing concretions and the host shales. Molecular parameter values based on dibenzothiophene and phenanthrene distribution and occurrence of di- and tetra-hydro-products of polycyclic aromatic compounds suggest that the rocks experienced relatively high-temperature aqueous conditions related to hydrothermal fluids, perhaps associated with neighboring mafic intrusions. The zircon was dissolved from the concretions, transported in fluids, and reprecipitated in voids. This is the first record of the precipitation of authigenic zircon in sedimentary rock as a new phase, not as outgrowths

Technical Design Report for the: PANDA Micro Vertex Detector

This document illustrates the technical layout and the expected performance of the Micro Vertex Detector (MVD) of the PANDA experiment. The MVD will detect charged particles as close as possible to the interaction zone. Design criteria and the optimisation process as well as the technical solutions chosen are discussed and the results of this process are subjected to extensive Monte Carlo physics studies. The route towards realisation of the detector is outlined.Comment: 189 pages, 225 figures, 41 table

Studies in the functional morphology of trilobites

This thesis is not available on this repository until the author agrees to make it public. If you are the author of this thesis and would like to make your work openly available, please contact us: [email protected] Library can supply a digital copy for private research purposes; interested parties should submit the request form here: http://www.lib.cam.ac.uk/collections/departments/digital-content-unit/ordering-imagesPlease note that print copies of theses may be available for consultation in the Cambridge University Library's Manuscript reading room. Admission details are at http://www.lib.cam.ac.uk/collections/departments/manuscripts-university-archive