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The oldest articulated chondrichthyan from the Early Devonian period
This specimen is the oldest shark showing the tooth families in situ, and preserves one of the oldest chondrichthyan braincases, and shows the presence of paired pectoral fin-spines, previously unknown in cartilaginous fishes. Expand
Paleoecology of Early Pennsylvanian vegetation on a seasonally dry tropical landscape (Tynemouth Creek Formation, New Brunswick, Canada)
The distribution and community ecology of Early Pennsylvanian (middle Bashkirian, Langsettian) vegetation on a seasonally dry fluvial megafan is reconstructed from plant assemblages in the TynemouthExpand
New biostratigraphical constraints on the lower Cambrian Ratcliffe Brook Formation, southern New Brunswick, Canada, from organic-walled microfossils
Organic-walled microfossils from the Ratcliffe Brook Formation of southern New Brunswick enable recognition of the three lowest Cambrian acritarch-based zones established in southeastern Poland andExpand
The braincase of the chondrichthyan Doliodus from the Lower Devonian Campbellton Formation of New Brunswick, Canada
Doliodus has curious bar-like, paired subcranial ridges ending posteriorly at the hyomandibular articulation, adding circumstantial palaeontological support to the old proposal that parts of visceral arches may be incorporated into the gnathostome braincase, although it seems more plausible that they formed in the lateral margins of the embryonic parachordal or hypotic lamina. Expand
Resolving MISS conceptions and misconceptions: A geological approach to sedimentary surface textures generated by microbial and abiotic processes
The rock record contains a rich variety of sedimentary surface textures on siliciclastic sandstone, siltstone and mudstone bedding planes. In recent years, an increasing number of these textures haveExpand
Climatic implications of D/H ratios in beetle chitin
Hydrogen isotopic analyses of beetle chitin demonstrate the potential for development of a palaeoclimatic tool that can be used to complement current palaeoentomological methods, and demonstrate small interspecific and intraspecific variation in beetles of different habit. Expand
Diverse tetrapod trackways in the Lower Pennsylvanian Tynemouth Creek Formation, near St. Martins, southern New Brunswick, Canada
Abstract Newly discovered tetrapod trackways are reported from eight sites in the Lower Pennsylvanian Tynemouth Creek Formation of southern New Brunswick, Canada. By far the most abundant andExpand
Stable hydrogen-isotope ratios in beetle chitin: preliminary European data and re-interpretation of North American data
Beetle exoskeletons contain chitin, a poly amino-sugar that is biosynthesized incorporating hydrogen isotopes from diet and water. As the stable isotope ratios D/H (or 2H/1H, expressed as δD values)Expand
Late-glacial climate in the Maritimes Region, Canada, reconstructed from mutual climatic range analysis of fossil Coleoptera
Mean July and January temperatures are reconstructed from radiocarbon-dated fossil beetle assemblages from late-glacial sites in the Maritimes Region of eastern Canada. Fossil-bearing sediments dateExpand
An Ichnotaxonomic Approach to Wrinkled Microbially Induced Sedimentary Structures
ABSTRACT Microbially induced sedimentary structures (MISS) are an important facet of recent paleoichnological work because of their taphonomic implications. MISS are extensively studied in terms ofExpand