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Unconformites

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Journal Article
Published: 01 March 2000
Journal of the Geological Society (2000) 157 (2): 483–492.
... formed NW‐SE to north–south striking thrusts and folds. Cross‐cutting structures, reactivation of structures, syn‐sedimentary deformation and unconformites help to constrain the relative timing of structural events. At least five episodes of predominantly NNW–SSE to NE–SW oriented compression interrupted...
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Series: GSA Memoirs
Published: 01 January 1981
DOI: 10.1130/MEM154-p393
... is evidenced by boundaries of differential structural deformation in seismic reflection profiles. In middle to late Miocene time, while orogenic activity affected the inland Andean Cordillera, the upper-slope Lima Basin subsided and began its depositional record. Unconformites in shelf basins apparently...
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1956
AAPG Bulletin (1956) 40 (2): 429–430.
... unconformites, even between series and systems. The two major unconformities shown on the cross section are at the base of the Pennsylvanian and at the base of the Woodford or the Misener. © 1956 American Association of Petroleum Geologists. All rights reserved 1956 American Association of Petroleum...
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Well correlation diagram for the studied wells from the breakup <span class="search-highlight">unconformit</span>...
Published: 01 January 2024
Figure 3. Well correlation diagram for the studied wells from the breakup unconformity to the K137 seismic marker, flattened on the J163 seismic marker. Map at lower right shows location of the transect in red. DT = sonic transit time; GAM = gamma ray; MD = measured depth; MFS = maximum flooding s
Journal Article
Published: 01 December 1970
Bulletin of Canadian Petroleum Geology (1970) 18 (4): 463–468.
... time . It was probably a part of the Late Cretaceous to Tertiary rifting episode that was wide- J. W. KERR PLATE 1 LEGEND Glacial gravels, morainal debris, silty, clay, stream sediments , marine beach deposits ANGULAR UNCONFORMIT Y Goose Fiord Formation ; dolomite, light grey to cream coloured, vuggy...
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Diagrams showing graphite contents (vol%) vs. distance from the <span class="search-highlight">unconformit</span>...
Published: 01 November 2022
Figure 6. Diagrams showing graphite contents (vol%) vs. distance from the unconformity. No significant trend is discernable, especially if the top 10 m is excluded. See text for discussion. (Color online.)
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Representative photographs of the main facies associations: (a) <span class="search-highlight">unconformit</span>...
Published: 22 June 2020
Fig. 4. Representative photographs of the main facies associations: (a) unconformity between Precambrian strata and alluvial fan conglomerate, Bréhec; (b) fluvial sandstones showing a channel (CH) cutting into flat-bedded strata (Sh), Alderney Sandstone Formation, Alderney; (c) hummocky cross-stra
Journal Article
Published: 01 June 1967
Bulletin of Canadian Petroleum Geology (1967) 15 (2): 208.
...) recently presented evidence that in the Vernon map-area the original rocks and the super imposed metamorph ism (1959, p. 47-49 and p. 28-29) five different localities where unconformit ies sep- arate Shuswap rocks of the Monashee and Chapperon Groups f rom rocks of the Cache Creek Group of Permian age...
Journal Article
Published: 01 June 1967
Bulletin of Canadian Petroleum Geology (1967) 15 (2): 208.
...) recently presented evidence that in the Vernon map-area the original rocks and the super imposed metamorph ism (1959, p. 47-49 and p. 28-29) five different localities where unconformit ies sep- arate Shuswap rocks of the Monashee and Chapperon Groups f rom rocks of the Cache Creek Group of Permian age...
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( a ) Geological map of the metamorphosed basement units at the <span class="search-highlight">unconformit</span>...
Published: 18 April 2019
Fig. 16. ( a ) Geological map of the metamorphosed basement units at the unconformity with the overlying sandstones at the uranium site. Provided by Cameco. ( b ) Complexly folded geological surfaces in the metamorphosed basement at the uranium site. ( c ) Geological model outlining the basement c
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UNCERTAINTIES IN AGE AND VERTICAL DISPLACEMENT FOR DIXIE VALLEY <span class="search-highlight">UNCONFORMIT</span>...
Published: 30 May 2018
TABLE 4. UNCERTAINTIES IN AGE AND VERTICAL DISPLACEMENT FOR DIXIE VALLEY UNCONFORMITIES AND CORRESPONDING STILLWATER RANGE KNICKPOINTS
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Photographs from the South Pamir terrane. (A) Cimmerian angular <span class="search-highlight">unconformit</span>...
Published: 18 April 2018
Figure 5. Photographs from the South Pamir terrane. (A) Cimmerian angular unconformity (ang. uncf.) beneath the Darbasatash Group (Gr.) (ridge location: 37.73N, 73.83E). (B) Representative stratigraphy of the South Pamir terrane (peak location: 38.0N, 74.07E). (C) Basal conglomerate (cong.) in the
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(a) The Metaconglomerato di Muravera Formation above the Sardic <span class="search-highlight">Unconformit</span>...
Published: 14 September 2017
Figure 5. (a) The Metaconglomerato di Muravera Formation above the Sardic Unconformity. (b) Centimetre-scale cross-laminated sandstone in the Arenarie di San Vito Formation, with sharp erosive contact that indicates an overturned younging direction. (c) Phycodes circinatum on an overturned limb
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Geometrical sketch of the Serra Spinella ridge. The progressive <span class="search-highlight">unconformit</span>...
Published: 23 December 2013
Fig. 13 Geometrical sketch of the Serra Spinella ridge. The progressive unconformities of the growth structure and the dip directions of the single sedimentary bodies are the result of an E-W oriented left-lateral strike-slip motion, as also shown by the complex fault association at the northern b
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Field photographs showing paleotopography of the intra-Chicotte <span class="search-highlight">unconformit</span>...
Published: 02 October 2006
Fig. 4. Field photographs showing paleotopography of the intra-Chicotte unconformity (broken line) and overlying rocky shoreline deposits. (A) Paleotopographic depression with about 5 m of relief along the intra-Chicotte unconformity filled and draped by massive biostromal limestones, 3.2 km east
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Deep seismic profile (SOEKOR data), also showing major regional <span class="search-highlight">unconformit</span>...
Published: 01 March 2004
Fig. 2.  Deep seismic profile (SOEKOR data), also showing major regional unconformities off Hondeklip Bay of the Orange Basin succession and the extent and depth of penetration of shallow seismic data, in relation to the overall basin stratigraphy (see Fig. 1 for location).
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Correlation of the 3 wells studied. The Maastrichtian&#x2F;Oligocene <span class="search-highlight">unconformit</span>...
Published: 01 January 2003
Text-Figure 8. Correlation of the 3 wells studied. The Maastrichtian/Oligocene unconformity, and the late Oligocene interval are based only on the log analyses, therefore they are tentative.
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Figure 5. Structure contour map drawn on the Tertiary-Paleozoic <span class="search-highlight">unconformit</span>...
Published: 01 November 2001
Figure 5. Structure contour map drawn on the Tertiary-Paleozoic unconformity in the Oak Creek Canyon–I-17 area of the Mogollon Rim; contour points and faults obtained from Weir et al. (1989) and author (unpublished map). Contours show a pediment under I-17 that embays the ancestral Mogollon Rim
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—Schematic map and structural cross section showing the angular <span class="search-highlight">unconformit</span>...
Published: 01 February 1999
Figure 4 —Schematic map and structural cross section showing the angular unconformity between the Leticia Formation and younger, subhorizontal Cenozoic beds, just north of Cabo Irigoyen. See Figure 2 for location.
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—Synthetic deviation (SYNDEV) can bring out subtle features. An <span class="search-highlight">unconformit</span>...
Published: 01 June 1998
Figure 2 —Synthetic deviation (SYNDEV) can bring out subtle features. An unconformity has been picked in this well at 1883.7 m from a formation imager. (The imager was not used to create the input dip data.) The SYNDEV azimuth plot (B) is simply the azimuth that each point on the synthetic borehol