Otherwise, shoreline ravinement during the transgression and erosion within the shoreface down to wave base during the highstand would bevel off any pre-existing shoreline.
Subaerial exposure during the Ypsilanti lowstand would be expected to have generated a weathering profile, an unconformity, and possibly a ravinement surface as a record of the regression-transgression cycle.
The beds exceed more than 2 m thickness in many places and, as can be seen on the bold, embayed cliff at the marsh-edge, rest sharply on a mainly wave-cut
ravinement surface underlain by pale brown, banded silts of the Rumney Formation.
Les desordres majeurs etaientprovoques par le pourrissement des structures porteuses en bois, les defauts de mise en oeuvre, les enduits en mortier de ciment, le
ravinement des fondations par les eaux souterraines et certaines adjonctions qui ont porte prejudice aux structures, qui ont ete restaurees en beton arme pendant l'epoque coloniale.
Allersma [36] and Rine and Ginsburg [37] proposed the migration of mud waves (mud banks) as an origin for erosion surfaces whereas wave scouring in front of an advancing shoreline is also an accepted origin for the regressive surface of marine erosion and
ravinement surface [38, 39].
The fossiliferous clastic and carbonate strata of the Mural Formation were deposited on a sharp
ravinement surface developed on the Morita Formation during a major marine transgression.
The early phase of the transgression was punctuated by a short wave
ravinement event on the level of the Vadja and Leivu Fms boundary (WRS, Fig.
cent des efflorescences sont reliees a des perturbations geomorphiques (glissement d'un decollement de la couche active, derochement du h la fonte regressive et
ravinement), qui sont a l'origine de la chaine causale suivante: 1) erosion de surface; 2) degradation locale du pergelisol; 3) contact entre la nappe d'eau du suprapergelisol et les ions solubles contenus precedemment dans les sediments geles; 4) augmentation de la concentration totale de solides en suspension dans l'eau de ruissellement de surface sur les pentes; et 5), dependant du degre de canalisation du drainage et du profil de la pente, transport direct des solides en suspension dans l'eau des ruisseaux ou leur redistribution et accumulation plus bas sur la pente.
8, separating the "paralic" unit "b" from the fully marine (shoreface) base of unit "c", is obviously characterized by a jump in facies and may be regarded as a shoreface
ravinement surface generated during the westward shifting of the transgression.