8th International Symposium Cephalopods – Present and Past,

Read or Download 8th International Symposium Cephalopods – Present and Past, August 30 – September 3, 2010, University of Burgundy & CNRS, Dijon – France. Abstracts Volume PDF

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Extra info for 8th International Symposium Cephalopods – Present and Past, August 30 – September 3, 2010, University of Burgundy & CNRS, Dijon – France. Abstracts Volume

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King2 1 11 Hereward Street, Bourne, Lincolnshire, United Kingdom PE10 9EX, United Kingdom 2 Suite 323, 7 Bridge Street, Taunton, Somerset, United Kingdom, TA1 1TD, United Kingdom The pilocerids are a group of mainly Early Ordovician cephalopods, and form a characteristic component of many low latitude assemblages, especially in North America and China. With some notable exceptions, the remains of these organisms are restricted to siphuncles containing massive endosiphuncular deposits, the presence of which has conventionally been taken as evidence of their taxonomic position within the Order Endocerida.

Flexuosum was preyed upon. Three shells were colonized by Stramentum, which provides further information about the mode of life of P. flexuosum, as well as its comparison to other spined species from different localities and ages. The spines of P. flexuosum were mostly restricted to its body chamber. Apparently, they were removed subsequently during growth, although the mechanism of removal is unclear. The abundant data on P. flexuosum at Vallecillo, on the paleoenvironment and on the early Turonian ecosystem are combined here to a palaeobiological model for the mode of life of this ammonite.

Studies of the development of the Silurian Cephalopod Limestone Biofacies have shown that it may be traced from Siberia, Bohemia, the Carnic Alps, Sardinia, Montagne Noire and the Ossa Morena in Spain (Kriz, 1998; Gnoli, 2003). The Carnic Alps is a key locality along the Northern Gondwana margin regarding Silurian biostratigraphical correlation. Recognition of environmental and water depth changes based on the fossil assemblages (mostly trilobites, brachiopods and bivalves) from the Silurian depositional sequences developed there (Brett et al, 2009) places a tight control on small scale bioevents within well-defined conodont, graptolite and chitinozoan biozones.

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