Belemnoidea

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Belemnoidea

[‚bə·ləm′nȯid·ē·ə]
(paleontology)
An order of extinct dibranchiate mollusks in the class Cephalopoda.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The carbon isotopic composition was expressed in relation to the Pee Dee Belemnite standard (FARQUHAR et al., 1989).
For these purposes, detailed measurement bed by bed of the lithological succession, ammonite-based biochronostratigraphical studies, coupled with stable isotope analysis of diagenetically screened belemnite calcite, and total organic carbon (TOC) analysis, have been performed.
[delta] [delta] [sup.18]O [sup.15]O (VSMOW) (Air) mean SD mean SD Mass reared moths 15.9 0.5 4.0 0.2 Cotton reared moths 20.6 0.5 10.8 0.7 [delta] [delta] [sup.13]O [sup.34]O (VPDB) (VCDT) mean SD mean SD Mass reared moths -25.1 0.7 1.0 0.3 Cotton reared moths -26.2 1.0 4.3 0.9 Note: The internationally recognized standards are: Vienna Standard Mean Ocean Water (VSMOW) for 18O, Vienna Pee Dee Belemnite (VPDB) for carbon, and Vienna Canon Diablo troilite (VCDT) for sulphur.
All the isotope ratio measurements were reported in the standard 5 notation (%): [[delta].sup.18]O={[([sup.18]O/[sup.16]O)A/ ([sup.18]O/16O)S]-1} x 1000, for instance, where A is otolith aragonite sample and S is an international standard (VPDB, Vienna Peedee belemnite).
The abundance of 18O and 13C in a sample is conventionally reported as the per mil (=mg/g or ) difference in delta (d) notation (d18O and d13C) between isotope ratios in the sample and those in the international Pee Dee Belemnite (PDB) standard which has d18O and d13C values of 0 (Hudson 1977).
The [[delta].sup.13]C-values were expressed in per mil deviation relative to the Pee Dee Belemnite (PDB) standard [43].
The standard was Pee Dee Belemnite limestone for carbon isotopes and atmospheric nitrogen for nitrogen isotopes.
In contrast, the positive carbon-isotope excursion associated with the Early Toarcian OAE has been attributed to an increased sequestration of isotopically light marine organic matter in ocean sediments under oxygen-depleted conditions, leading to the corresponding 'heavy' signal preserved in bulk rock, belemnite calcite, marine organic matter, and wood [6-7, 10-14].
Los valores de [[delta].sup.13]C ([sup.13]C/[sup.12]C) se expresan en partes por mil ([por millar]) siguiendo al estandar internacional PeeDee Belemnite (PDB) con un error menor al 0, 1[por millar] y las del [[delta].sup.15]N ([sup.15]N/[sup.14]N) en partes por mil ([por millar]) segun el estandar internacional para el nitrogeno atmosferico (Air) con un error menor de 0, 2[por millar].
These are a common find in the south of the country but the lady at the museum was puzzled as to how it came to be in our back garden as they have only been found as far North as Yorkshire." Museum experts told Claire, who works with autistic children, and husband Billy, 46, a driver, that their daughter had stumbled on the remains of a sea creature from the Jurassic period, known as a belemnite, which looks like a dart or bullet.