Significance We present a quantitative test of end-Cretaceous extinction scenarios and how these would have affected dinosaur habitats. Combining climate ecological modeling tools, we demonstrate substantial detrimental effect on habitats caused by an impact winter scenario triggered the Chicxulub asteroid. were not able to obtain such state with several Deccan volcanism. further show that concomitant prolonged eruption traps might acted as ameliorating agent, buffering negative effects...

Actualistic experiments have quantified rate of anaerobic decay and associated mineralization around proteinaceous macro-organisms. Carcasses the polychaete worm Nereis eumalacostracans Nephrops Palaemon were buried in airtight glass jars filled with sediment water from marine, brackish, lacustrine environments. Over a period 25 weeks contents examined to determine state chemically analyzed monitor early diagenetic (two methods for such analysis are reviewed). Decay processes active...

A review of the processes required for exceptional preservation soft-bodied fossils demonstrates that anoxia does not significantly inhibit decay and emphasizes importance early diagenetic mineralization. Early diagenesis is principal factor amongst complex leading to soft-part preservation. The development a particular preservational mineral controlled by rate burial, amount organic detritus, salinity. new causative classification fossil biotas presented based upon mineralogy paragenesis.

Research Article| June 01, 1993 Exceptional fossil record: Distribution of soft-tissue preservation through the Phanerozoic Peter A. Allison; Allison 1Postgraduate Institute for Sedimentology, University Reading, Whiteknights, Reading RG6 2AB, England Search other works by this author on: GSW Google Scholar Derek E. G. Briggs 2Department Geology, Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1TR, Author and Article Information Publisher: Geological Society America First Online:...

Aims & Scope Topics in Geobiology Book SeriesTopics series treats geobiology -the broad discipline that covers the history of life on Earth.The aims for high quality, scholarly volumes original research as well reviews.Recent have showcased a variety organisms including cephalopods, corals, and rodents.They discuss biology these organisms-their ecology, phylogeny, mode addition, their fossil record distribution time space.Other are more theme based such predator-prey relationships, skeletal...

Abstract A new modelling framework is presented for application to a range of three‐dimensional (3D) multi‐scale oceanographic problems. The approach based upon finite element discretization on an unstructured tetrahedral mesh which optimized represent highly complex geometries. Throughout simulation the dynamically adapted in 3D optimize representation evolving solution structures. adaptive algorithm makes use anisotropic measures complexity and load‐balanced parallel optimization vary...

Large-scale extraction of power from tidal streams within the Pentland Firth is expected to be underway in near future. The Inner Sound Stroma particular has attracted significant commercial interest. To understand potential environmental impacts installation a turbine array case study based upon considered. A numerical computational fluid dynamics model, Fluidity, used conduct series depth-averaged simulations investigate velocity and bed shear stress changes due presence idealised arrays....

Abstract In the lead-up to Cretaceous/Paleogene mass extinction, dinosaur diversity is argued have been either in long-term decline, or thriving until their sudden demise. The latest Cretaceous (Campanian–Maastrichtian [83–66 Ma]) of North America provides best record address this debate, but even here reconstructions are biased by uneven sampling. Here we combine fossil occurrences with climatic and environmental modelling quantify American habitat. Ecological niche shows a...

Taphonomic processes in deep-water environments differ markedly from those shallow waters. These differences are illustrated by the preservational style of a large cetacean skeleton lying at bottom Santa Catalina Basin 1,240 m water. The degree skeletal articulation contrasts with that documented North Sea where gas-filled, buoyant carcasses disarticulated during flotation. Increased hydrostatic pressure greater depth is presumed to have prevented whale carcass floating and promoted...

Research Article| December 01, 1986 Soft-bodied animals in the fossil record: The role of decay fragmentation during transport Peter A. Allison 1Department Geology, University Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, England Search for other works by this author on: GSW Google Scholar Geology (1986) 14 (12): 979–981. https://doi.org/10.1130/0091-7613(1986)14<979:SAITFR>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Manager Share Icon...

Abstract Modern mangroves are among the most carbon-rich biomes on Earth, but their long-term (≥10 6 years) impact global carbon cycle is unknown. The extent, productivity and preservation of controlled by interplay tectonics, sea level sedimentation, including tide, wave fluvial processes. these processes mangrove-bearing successions in Oligo–Miocene South China Sea (SCS) evaluated herein. Palaeogeographic reconstructions, palaeotidal modelling facies analysis suggest that elevated tidal...

Abstract The Miocene to Modern Baram Delta Province is a highly efficient source sink system that has accumulated 9 12 km of coastal–deltaic shelf sediments over the past 15 Myr. Facies analysis based on ca 1 total vertical outcrop stratigraphy, combined with subsurface geology and sedimentary processes in present‐day Province, suggests ‘storm‐flood’ depositional model comprising two distinct periods: (i) fair‐weather periods are dominated by alongshore sediment reworking coastal sand...

The latitudinal biodiversity gradient (LBG), in which species richness decreases from tropical to polar regions, is a pervasive pattern of the modern biosphere. Although distribution fossil occurrences suggests this has varied through deep time, recognition palaeobiogeographic patterns hampered by geological and anthropogenic biases. In particular, spatial sampling heterogeneity capacity impact upon reconstruction time LBGs. Here we use simulation framework test detectability three different...

Research Article| May 01, 1998 Bryozoan carbonates through time and space Paul D. Taylor; Taylor 1Department of Palaeontology, Natural History Museum, London SW7 5BD, United Kingdom Search for other works by this author on: GSW Google Scholar Peter A. Allison Kingdom2Department Geology, Imperial College, 2BP Author Article Information Publisher: Geological Society America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print 0091-7613 Geology (1998) 26 (5): 459–462....

Research Article| January 01, 1993 Paleolatitudinal sampling bias, Phanerozoic species diversity, and the end-Permian extinction Peter A. Allison; Allison 1Postgraduate Institute for Sedimentology, Reading University, Whiteknights, RG6 2AB, England Search other works by this author on: GSW Google Scholar Derek E. G. Briggs 2Department of Geology, University Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, Author Article Information Publisher: Geological Society America First...

A diagenetic case study of phosphatized soft-bodied squids from the lower part Oxford Clay Christian Malford, Wiltshire, has dated mineralization in relation to burial history. Complete with mantle tissues were examined under SEM as uncoated specimens at low KV. simple stage attachment designed for this purpose is described. Soft-parts are preserved three dimensions and must therefore have been mineralized prior decay-induced tissue collapse. Such occurred near anoxic/oxic boundary ‘soupy’...

Actualistic laboratory experiments have documented the preservation potential of selected echinoderms and calibrated rate decay with weight-loss chitin in litter bags. The results are integrated field which quantified flowing seawater, intertidal sediments freshwater mud using identical Decay was generally slower than marine muddy environments open seawater. Sediment-induced variation is within an order magnitude. duration required to promote fragmentation varied little between two regular...

Reef corals are currently undergoing climatically driven poleward range expansions, with some evidence for equatorial retractions. Predicting their response to future climate scenarios is critical conservation, but ecological models based only on short-term observations. The fossil record provides the empirical long-term of organisms under perturbed states. palaeontological from Last Interglacial (LIG; 125 000 years ago), a time global warming, suggests that reef experienced shifts and an...