English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The present note reports on a detailed survey of a part of the Jurassic - Lower Cretaceous deepening sequence exposed along the Candigliano River west of the hamlet Gorgo a Cerbara in the Umbrian-Marchean Apennines (Italy). The section examined spans the late Pliensbachian to? Bajocian interval, with a major documentary gap in the Toarcian (accounted for by a Neogene fault), and comprises the top of the Corniola Fm. and parts of overlying Bosso Fm. (inclusive of the Mbs. Rosso Ammonitico and Calcari e Marne a Posidonia). Facies of "autochthonous" rock types -mostly lime mudstones and nodular wackestones- invariably imply a deeper-water origin; moreover, inasmuch as gravity-displaced sediment makes up about half the thickness of the section, a depositional setting can be inferred in thc lower reaches or at the base of an unstable slope flanking a structurally- controlled intrabasinal high. The in situ hemipelagic limestones in the upper part of the Corniola Fm. (our lithologic units 1 and 2) have yielded ammonites at 6 separated levels. The ammonite assemblages recovered indicate a late Domerian to earliest Toarcian age. The ammonites collected systematically across the lower nodular limestone unit of the Bosso Fm. (our lithologic unit 3) have enabled the upper Toarcian and part of Aalenian to be recognized and resolved to the zonal and, in certain cases, subzonal level. From the middle Aalenian (Murchisonae Zone p.p.) on, a higher dissolution intensity in the depositional and very shallow burial environment, most likely related to increasing bottom depth, causes the remains of originally aragonitic skeletal components to disappear from the sedimentary record, thus precluding an age control by means of ammonite biostratigraphy. En un punto cercano a la localidad de Gorgo a Cerbara (Apenino Umbro-Marchigiano, Italia) se ha efectuado el levantamiento de una columna estratigr&#225;fica correspondiente al intervalo. de tiempo Pliensbachiense superior-Dogger medio dentro del ciclo de profundizaci&#243;n jur&#225;sico. La sucesi&#243;n estudiada -en la que se han distinguido 4 tramos litol&#243;gicos- comprende materiales incluidos, de muro a techo, en las unidades litoestratigr&#225;ficas "Corniola" (parte terminal) y "Formazione del Bosso" que incluye los Miembros "Rosso Ammonitico" y "Calcari e Marne a Posidonia". Se trata de una secuencia formada en un ambiente de pi&#233; de talud ligado a un alto fondo submarino, present&#225;ndose el registro sedimentario notablemente expandido debido a la alta proporci&#243;n de materiales al&#243;ctonos. En las hemipelagitas de la parte superior de la "Corniola" (tramos 1 y 2), se ha registrado una sucesi&#243;n de ammonites representativa del Domeriense superior y de la base del Toarciense. En las calizas nodulosas de la parte inferior de la "Fm. del Bosso" (tramo 3), los ammonoideos registrados han permitido reconocer el Toarciense superior y Aaleniense p.p. y efectuar divisiones a nivel de subzona. A partir del Aaleniense medio (tramo 4), como consecuencia de la creciente intensidad de disoluci&#243;n en ambiente deposicional y diagen&#233;tico temprano, desaparecen del registro estratigr&#225;fico los restos de organismos con esqueleto aragon&#237;tico, no siendo por tanto posible la dataci&#243;n de los materiales suprayacentes mediante ammonoideos

El Lias Superior y el Dogger inferior en Gorgo a Cerbara (Apenino Central): Aspectos bioestratigráficos y sedimentológicos