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Onlap or overlap is the geological phenomenon of successively wedge-shaped younger rock strata extending progressively further across an erosion surface...

paraconformities are called diastems. A buttress unconformity also known as onlap unconformity, occurs when younger bedding is deposited against older strata...

onlap, and onlap of overlying strata". Similarly, a type 2 sequence boundary is "marked by subaerial exposure and a downward shift in coastal onlap landward...

marine facies are deposited over shallower facies, a succession called onlap. Regression is the situation in which a coastline moves in the direction...

A marine transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, which results...

A marine regression is a geological process occurring when areas of submerged seafloor are exposed during a drop in sea level. The opposite event, marine...

expression of lunar soil development. The fillet is characterized by an onlap contact with the adjacent rock and by a shallow or concave profile. Associated...

the northern part of the basin; southward, progressively younger strata onlap the basement, so that in the southern areas the basement is overlain by...

the interpretation of seismic profiles to determine the extent of coastal onlap in subsequently buried sedimentary basins. Murray-Wallace, C. V., & Woodroffe...

series rests upon progressively older members of the underlying series." An onlap is a more general term than overstep, in which the younger beds overlap...

Taghanic onlap) was an extinction event that occurred about 386 million years ago during the Givetian faunal stage of the Middle Devonian geologic period...

Planum and against the Coprates Rise, these sheet lavas were observed to onlap underlying plains materials and their associated ridged morphologies. Further...

out significantly as it approaches the basin margins due to transgressive onlap. The Brushy Canyon Formation also contains small reef patches, ripple marks...

response to plate reorganization following the opening of the Gulf of Aden. Onlap of the Miocene and younger stratigraphy on the southeast side of the ridge...

Ouachita orogeny began and progressed from the north to the south, offlap and onlap stratigraphic geometries were produced. The orogeny contributed a large...

The Honda Group (Spanish: Grupo Honda, Tsh, Ngh) is a geological group of the Upper and Middle Magdalena Basins and the adjacent Central and Eastern Ranges...

The Sabana Formation (Spanish: Formación Sabana, Q1sa, QTs) is a geological formation of the Bogotá savanna, Altiplano Cundiboyacense, Eastern Ranges of...

into two sections, the Upper Gault and the Lower Gault. The Upper Gault onlaps onto the Lower Gault. The Gault Formation thins across the London Platform...

overlies the Franciscan Assemblage along the west margin of its extent, and onlaps onto granitic rocks of the Sierra Nevada in the east. The rocks in Great...

with compressional phases becoming younger from east to west. While the onlap and erosion in the Clamosa area started in the early Eocene, around 49 Ma...