Search results for "Westphalian sovereignty"
showing 3 items of 3 documents
Séries charbonneuses dans des séquences rétrogradantes: cas du bassin houiller paralique westphalien de Jérada (Maroc)
1998
Abstract Several orders of stacked genetic sequences in the Westphalian C of the Jerada Basin are defined from detailed sedimentological data. Eight coal seams were formed in this paralic basin as distal facies passed laterally into proximal facies in retrogradational stages. These stages are related to base level rises that curtailed detrital influx and induced the development of swamps and the preservation of organic matter below anoxic water levels. The base level variations are related to active faulting along the basin margins and to sea level changes in the Palaeo-Tethys.
Organics versus clastics: conditions necessary for peat (coal) development
1990
Abstract The absence or lack of detrital influx into ancient peat-forming swamps is critical to the formation of low-ash coal. Modern and ancient coal-forming swamps of continental basins show a separation of peat and clastic sediments which is partially fault controlled. In the African rift valleys as well as in the Stephanian intermontane coal basins of France, thick peat free from clastic input may be the result of tectonic activity. In the paralic basins of Morocco (Westphalian B) and Nigeria (Late Cretaceous) coal occur landward of the shoreline turnaround and are related to a relative high stand of the sea, which curtailed detrital influx into the basins. Thus, peat formation occurred…
SIGNIFICANCE FOR INTERNATIONAL CORRELATION OF THE PERAPERTÚ FORMATION IN NORTHERN PALENCIA, CANTABRIAN MOUNTAINS. TECTONIC/STRATIGRAPHIC CONTEXT AND …
2021
Small ammonoid assemblages are recorded from the Perapertú Formation in northern Palencia. This is a mudstone unit with local platform limestones characterised by carbonate debris flows on the limestone margins. This unit, of Late Bashkirian to Early Moscovian age, participates in a series of southwards verging thrust slicesNorth of a major fault zone which originated as the head (leading edge) of a large thrust sheet with an internal deformation consisting of thrust slices and at least one nappe structure. Opposed vergencies at the head of this major thrust sheet (Carrionas Thrust Front) and the Ruesga Fault which locally modifies its trace, mark the position where the northern branch of t…