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pebble isopleth maps

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Journal Article
Journal: GSA Bulletin
Published: 01 September 1956
GSA Bulletin (1956) 67 (9): 1199–1206.
...ARTHUR DAVID HOWARD Abstract An isopleth map shows the distribution of a variable by lines of equal magnitude called isopleths. Till-pebble isopleth maps show the areal distribution of pebbles of different rock types in till. Four till-pebble isopleth maps were prepared during a reconnaissance...
Image
Generalized geologic <span class="search-highlight">map</span> of Lima-Monida area with maximum or zero-<span class="search-highlight">pebble</span> is...
Published: 01 October 1970
FIG. 6. Generalized geologic map of Lima-Monida area with maximum or zero-pebble isopleths of Mesozoic, Paleozoic, and Precambrian rock units indicated by dashed lines. Zone of occurrence of Late Mississippian coral Caninia excentrica (Meek) is shown with solid line. Pattern of isopleths
Journal Article
Published: 01 May 2001
Geochemistry: Exploration, Environment, Analysis (2001) 1 (2): 163–173.
... as crystalline rock. The abundance of crystalline rock in the east, and the alignment of the 30 wt.% isopleth, reflect late glacial southward flow from crystalline terrain north of the Basin. Fig. 3. Concentration of Pitz Formation volcanic rock pebbles (4–5.6 mm) in till. Shaded area indicates bedrock...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1953
AAPG Bulletin (1953) 37 (5): 961–974.
... to record these data here. FIG. 1. —Index map of Galisteo-Tonque area, showing principal outcrops of Upper Cretaceous rocks and isopleths of thickness of Upper Cretaceous rocks preserved beneath pre-Galisteo unconformity. Rankin (1944) showed that the Dakota(?) formation, Graneros...
FIGURES | View All (6)
Journal Article
Journal: AAPG Bulletin
Published: 01 October 1970
AAPG Bulletin (1970) 54 (10): 1843–1867.
...FIG. 6. Generalized geologic map of Lima-Monida area with maximum or zero-pebble isopleths of Mesozoic, Paleozoic, and Precambrian rock units indicated by dashed lines. Zone of occurrence of Late Mississippian coral Caninia excentrica (Meek) is shown with solid line. Pattern of isopleths...
FIGURES | View All (17)
Journal Article
Journal: Economic Geology
Published: 01 September 2019
Economic Geology (2019) 114 (6): 1195–1206.
... and to construct quartz isopleths in temperature-pressure space within the single-phase field of the respective model system. The phase boundaries of the single-phase field in the H 2 O-NaCl model system were taken from Driesner and Heinrich (2007) . The phase boundaries in the H 2 O-NaCl-CO 2 model systems were...
FIGURES | View All (7)
Journal Article
Published: 01 August 1974
Quarterly Journal of Engineering Geology and Hydrogeology (1974) 7 (3): 257–295.
.... Examples on a regional scale of computer and manual plots of clay zones are given as well as maps showing palaeogeography, mineralogy and engineering property distributions. Examples of the geological and geotechnical depth profiles which were used to establish relations between lithology, zonation...
Journal Article
Published: 01 March 2007
Journal of the Geological Society (2007) 164 (2): 425–438.
... of the orogen before it was destroyed by severe extension. Fig. 1.  ( a ) Tectonic map of the Aegean Sea showing the boundaries of major tectonic units and the location of the present-day subduction zone (modified after Jacobshagen 1986 ). The island of Amorgos is located at the boundary between...
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Journal Article
Journal: GSA Bulletin
Published: 01 February 2003
GSA Bulletin (2003) 115 (2): 230–248.
... to determine the Upper Toluca Pumice distribution and to construct isopach and isopleth maps for each fall horizon ( Figs. 11 and 12 ). PC0 has a 70°NE dispersal axis with some preserved outcrops as far as 14 km from the vent. It covers an area of 157 km 2 within the 5 cm isopach. PC1 has the most...
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Journal Article
Published: 05 December 2012
Canadian Journal of Earth Sciences (2013) 50 (4): 439–461.
... Arch (note that in this map, units of measure for structure contours on the top of the Colorado Group were unlabeled but are in fact in feet, after fig. 2 of Tovell, 1958 ; some authors have reproduced this map with contours erroneously labelled in metres). Podruski (1988) concluded that the Bow...
FIGURES
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1945
AAPG Bulletin (1945) 29 (9): 1233–1261.
... an initial steeper portion the roundness curve flattens to a trend at about 0.4. FIG. 4. —Sketch map of Arroyo Seco, Los Angeles County, California, showing area of Lowe granodiorite. FIG. 5. —Granodiorite pebbles, Arroyo Seco. Left , from point A ( Fig. 4 ); right , from point C...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1970
AAPG Bulletin (1970) 54 (5): 789–806.
..., an isopleth map of boulder size distribution was prepared as a supplementary means of delineating sourceland characteristics. The provenance study of the Johns Valley boulders involves a determination of the boulder source rocks, sourceland characteristics, the probable mechanism of boulder emplacement...
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Journal Article
Published: 01 March 1986
Journal of the Geological Society (1986) 143 (2): 237–252.
... Opaques Others$ Connemara (between areas A and B) has not been mapped in the same detail, and the Lakes Marble Formation has not been subdivided. Nevertheless the characteristic area B lithologies are all found, psammitic rocks show graded bedding and pebbly bands typical of the Luggartarriff member...
Journal Article
Journal: Economic Geology
Published: 01 August 2018
Economic Geology (2018) 113 (5): 1007–1046.
... of the liquid, occur during cooling and decompression. Figure 2 shows the isoplethic sections through the H 2 O-NaCl phase diagram for hydrothermal fluids containing 5, 10, and 20 wt % NaCl. Salinities in this range are typical for single-phase, magmatic-hydrothermal fluids exsolving from crystallizing...
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Journal Article
Published: 01 March 2010
Journal of the Geological Society (2010) 167 (2): 329–345.
... 1982 ; Schulmann et al . 1991, 1994 ; Höck 1995 ). Fig. 1. ( a ) Location of the study area in the European Variscides. ( b ) Geological map of the northeastern part of the Moldanubian zone (Bohemian Massif). The rectangular outline represents the area of the detailed structural map presented...
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Journal Article
Published: 16 August 2011
Geological Magazine (2012) 149 (2): 177–207.
...) Geological map of the Chilean Coastal Range at lat. 31–32°S after Rivano & Sepúlveda ( 1983 ). However, at the more northerly latitudes (30–32°S) the metamorphic basement occurs as scattered inliers within the Jurassic–Early Cretaceous arc, whereas the late Palaeozoic magmatic arc occurs...
Journal Article
Journal: Geology
Published: 01 May 2000
Geology (2000) 28 (5): 423–426.
... time of separation for the Laurentian and Siberian cratons. Figure 1. Paleoproterozoic reconstruction of Siberian craton and western Laurentia. Margin of Laurentia is ISr = 0.706 isopleth, in Canada as defined by Armstrong (1988) , but with 450 km of right slip restored on Tintina–Northern Rocky...
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Journal Article
Published: 27 July 2009
Geological Magazine (2010) 147 (1): 98–122.
... represent ( Fig. 2 ), after the Basal Conglomerate, the oldest and the richest in metamorphic pebbles (Cadel et al . 1996 ) deriving from erosion of the Variscan chain and deposited in intramontane elongated troughs (Cassinis & Neri, 1999 ). Figure 1 Tectonic sketch map of the Orobic Alps...
Journal Article
Journal: GSA Bulletin
Published: 01 October 2002
GSA Bulletin (2002) 114 (10): 1210–1221.
..., which crops out across the projected fault trace. Rocks assigned to the Mount Morrison Sandstone at Strange Hill have an aggregate exposed thickness of 25–30 m ( Table 1 ). The lowest beds consist of pebbly limestone turbidites that have yielded late Middle Devonian (Givetian) conodonts. This age...
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Journal Article
Published: 01 April 1988
Journal of the Geological Society (1988) 145 (2): 235–248.
... of tectonically induced cycles of sedimentation which are interpreted in terms of waves of detritus working down the drainage system. Beds dominated by pebbly horizontal laminae and reminiscent of steep, straight and shallow ephemeral streams alternate with troughed sands of deeper, more sinuous, but equally...