angular unconformity


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angular unconformity

[′aŋ·gyə·lər ‚ən·kən′fȯrm·əd·ē]
(geology)
An unconformity in which the older strata dip at a different angle (usually steeper) than the younger strata.
References in periodicals archive ?
Taken collectively, the petrographic evidence for basement-contact relations overwhelmingly supports a tectonic contact in most locations, and an angular unconformity in one locality, Timber Brook.
The Warrensburg Sandstone Lies with angular unconformity upon cyclothemic rock units belonging to the Desmoinesian Series (Figures 3 and 4).
Third-stage deposits lie on the second-stage sediments with a slight angular unconformity and, moreover, the transition is marked by paleosol remnants.
The boundary with the Albarracin Formation is transitional, although as a result of its syntectonic deposition, the Mogna Formation also lies with an angular unconformity over the Albarracin Formation in the upper part of the fold limbs and on the Devonian succession in the anticlinal crest zone (Fig.
Besides these relationships, the general N-S trend of the La Premia Formation conglomerates and ignimbrites substantially differs from the more complex distribution of the Andacollo Group outcrops, due to their different deformation grade and the pronounced angular unconformity that separates them (e.
Trenches excavated across the RFF reveal a distinct angular unconformity, steeply dipping strata cut by low-angle thrusts, and an unconformity below relatively undeformed strata [Hebeler et al.
The Dasht Murgha group overlies the Nisai Formation with angular unconformity.
Some researchers consider that, the basement of Qiangtang Basin is buildup by two-layers of Proterozoic metamorphic rocks, lower crystal --rigid basement , upper metamorphic --plastic basement , and middle angular unconformity (Wang GZ et al.
The PTB exhibits three types of contact according to the location, ranging from the central axis to the margins of the depositional area: i) disconformity overlain by quartz-conglomerate; ii) apparent transition; or iii) angular unconformity produced by intra-Permian tilting (Durand, 2006).
The basal conglomerates of the Ait Driss Member rest unconformably on Cambrian to Devonian folded metasediments, and locally, with an angular unconformity on Late Carboniferous sediments (Hmich et al.