Publication: Los Hammatoceratinae (Amonitina) del Toarciense y Aaleniense en la Cordillera Ibérica y Cantábrica oriental. Implicaciones paleobiogeográficas
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1996
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Sociedad Española de Paleontología
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Abstract
Los Hammatoceratinae constituyen una de las subfamilias de ammonoideos que están presentes en los materiales del Lías y del Dogger del Norte de España, con un registro escaso en relación al resto de los ammonoideos. Se han distinguido 43 especies y 7 géneros que se distribuyen desde la Zona Variabilis (Subzona IIIustris) del Toarciense hasta la Zona Disci tes del Bajociense. El estudio de las diferentes morfologías y la identificación de las diferentes asociaciones tafonómicas, permiten reconocer en ellas elementos procedentes de áreas mesogeas y del NW de Europa. El origen de este grupo podría encontrarse en determinadas formas mesogeas, que pudieron invadir áreas de plataforma. En la mayoría de los casos los elementos registrados corresponden a conchas derivadas procedentes de regiones más o menos alejadas del lugar de enterramiento. Así mismo existen elementos que pudieron colonizar algunas áreas de la Cuenca Ibérica y de la Cuenca Vasco-Cantábrica, durante determinados episodios de las Zonas Insigne, Alensis y Opalinum.
One or the ammonite subfamilies prescnt in lhe northern Spain Lías and Dogger materials is the Hammatoceratinae, whose record is mostly scarce proportionaly to lhe other groups. 43 species and 7 genera have been ident ified, with a distribution range from the Toarcian (Variabilis Zone, I1lustris Subzone) to the Bajoeian (Discites Zone). Discrimination between the Mesogean and the NW Europe areas eharaeteri slic e lements is possible on aceounl of the study of the morphologyeal aspects and Ihe idenlification of the differents taphonomical associatíons. The origín of the group might be found in some Mesogean forms, which were lhe origin of invasions towards platform areas. In most of the cases the registrated elements correspond to drifted sheIls whith more or less remole original regions in relatíon to the burial place; the minor oceurrellce corresponds to real pioncer individuals 01' some areas 01' lhe Iberian Basin and the Vasco-Cantabrian Basin during seve ral episodes of the Insigne, Aalensis and Opalinum Zones.
One or the ammonite subfamilies prescnt in lhe northern Spain Lías and Dogger materials is the Hammatoceratinae, whose record is mostly scarce proportionaly to lhe other groups. 43 species and 7 genera have been ident ified, with a distribution range from the Toarcian (Variabilis Zone, I1lustris Subzone) to the Bajoeian (Discites Zone). Discrimination between the Mesogean and the NW Europe areas eharaeteri slic e lements is possible on aceounl of the study of the morphologyeal aspects and Ihe idenlification of the differents taphonomical associatíons. The origín of the group might be found in some Mesogean forms, which were lhe origin of invasions towards platform areas. In most of the cases the registrated elements correspond to drifted sheIls whith more or less remole original regions in relatíon to the burial place; the minor oceurrellce corresponds to real pioncer individuals 01' some areas 01' lhe Iberian Basin and the Vasco-Cantabrian Basin during seve ral episodes of the Insigne, Aalensis and Opalinum Zones.