Correlations of borehole geophysical logs in the middle and upper Turonian Chalk Group are used to consider recent proposals for a revision understanding unit hardgrounds (Chalk Rock) associated stratigraphy developed across parts southern England. Along northern edge London Wessex basins, reveal laterally continuous framework correlatable inflection patterns New Pit Chalk, with package sedimen...

available online at http://meteoritics.org 1 © Meteoritical Society, 2004. Printed in USA. Is the transition impact to post-impact rock complete? Some remarks based on XRF scanning, electron-microprobe, and thin section analyses of the Yaxcopoil-1 core in the Chicxulub crater J. SMIT,1* S. VAN DER GAAST,2 and W. LUSTENHOUWER1 1Faculty of Earth and Life Sciences, Vrije Universiteit, de Boelaan 1...

Brett, C. E. and Brookfield, M. E., 1984. Morphology, faunas and genesis of Ordovician hardgrounds from southern Ontario, Canada. Palaeogeogr., PaIaeoclirnatol., PalaeoecoI., 46: 233-290. We have used associations of different rnicrofacies to define facies (or microfaties associations) which fom reasonably welldefined sequences, which we infer, from amlogies with recent and ancient carbonate en...

Site U1317 (proposal Site PORC-3A) is located on the northwest shoulder of the Challenger Mound (51o 22.8 N, 11o 43.1W, in 781 to 815 m water depth). Scientific drilling of the Challenger Mound was the central objective of Expedition 307. Specific objectives of drilling Site U1317 were: • To establish whether the mound base is on a carbonate hardground of microbial origin and whether past geofl...

Abstract Understanding the causes of formation hardgrounds provides insights on oceanographic evolution a basin. Phosphate-rich hardground interrupted carbonate ramp deposition in Mediterranean during Miocene. We analyzed εNd record three central to identify origin phosphate-rich waters that formed them within frame Miocene paleoceanographic evolution. The Nd isotopes suggest eastern deep were ...

Colonial corals occur in a wide range of marine benthic habitats from the shallows to the deep ocean, often defining the structure of their local community. The black coral Leiopathes glaberrima is a long-lived foundation species occurring on carbonate outcrops in the Northern Gulf of Mexico (GoM). Multiple color morphs of L. glaberrima grow sympatrically in the region. Morphological, mitochond...