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- Large-scale geological structures including anticlines, synclines, thrusts and faults formed during the Caledonian Orogeny typically trend in a SW-NE direction.
- Tectonic movement locally folded and uplifted the Pabdeh Formation exposing it to erosion along the crests of anticlines before this unconformity was buried beneath the Asmari Limestone.
- The Zagros Simply Folded Zone can be distinguished from the rest of the orogen by NW-SE-trending parallel folds and thrust-cored anticlines which verge to the SW in a 6-12 km thick cover sequence.
- The displacement of the thrust sheet produces two anticlines and a syncline.
- If this is true, then the succession had been folded into two long-wave length anticlines and intervening synclines with an amplitude of 35-40 m and several smaller folds.
- It has been previously reported that because of extension of the outer arc of such anticlines, graben form above their crests.
- Following the intrusion of basic dykes in the late Palacocene, the whole of the post-Zechstein succession was gently folded into a series of major synclines and anticlines.
- In its hanging wall, however, a drag fold syncline and a rollover anticline developed.
- Present along the surface exposures of the anticline are rocks dating from Upper Cretaceous to Paleocene age.
- In this locality, the top 20 m of the Asmari Limestone exhibits palaeo-weathering along joints suggesting subaerial exposure of the Asmari near the crest of an anticline.
- From the maps presented in Figure 2, it is apparent that the well tested the crest of an anticline that formed during the Cenozoic.
- These fault-parallel footwall anticlines are best developed along fault segments 3 and 4, although there are also examples of fault-parallel folding in the footwall of fault segments 1 and 2.
- Folds associated with intraformational faults in the Tertiary mudstones of the southernmost North Sea show a similar asymmetry, with anticlines locally developing into diapiric structures.
- Its topography, represented by the alleged anticlines and synclines of Rosenkrantz, is instead an expression of the original sea-floor topography.
- It is possible that faulting along the crests of deep-seated anticlines provide the conduit for mobile muds to migrate through to the seafloor surface.
- Bozkurt mainly provides a short, but incomplete, summary of previous work on field characteristics of extensional folds, including rollover anticlines.
- In this case the folds found within the Miocene sediments have been interpreted as extensional folding in the form of the ramp anticlines and drag folds.
- The field evidence includes the presence of several longitudinal extensional folds such as a rollover anticline and drag folds that are related to normal faults in the area.
- This mechanical failure results in a topographic valley along the crest of the anticline.
- Fold profiles of individual ramp anticlines above the thrusts suggest, using bed-length balancing, a minimum shortening of 10% as a result of folding.