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Till-pebble isopleth

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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...
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Concentration of Pitz Formation volcanic rock <span class="search-highlight">pebbles</span> (4–5.6 mm) in <span class="search-highlight">till</span>. S...
Published: 01 May 2001
Fig. 3. Concentration of Pitz Formation volcanic rock pebbles (4–5.6 mm) in till. Shaded area indicates bedrock source. The eastern margin and the central core of the train, outlined by the 10 wt.% isopleth, are both aligned with the last regional direction of ice flow.
Image
Concentration of crystalline rock <span class="search-highlight">pebbles</span> (4–5.6 mm) in <span class="search-highlight">till</span>. Shaded area i...
Published: 01 May 2001
Fig. 5. Concentration of crystalline rock pebbles (4–5.6 mm) in till. Shaded area indicates bedrock source. Coarse-grained facies of Christopher Island Formation (CIF: cf. Fig. 1) are classified crystalline, leading to overestimation of crystalline rock in areas of CIF bedrock, south of Pitz
Journal Article
Published: 01 May 2001
Geochemistry: Exploration, Environment, Analysis (2001) 1 (2): 163–173.
...Fig. 3. Concentration of Pitz Formation volcanic rock pebbles (4–5.6 mm) in till. Shaded area indicates bedrock source. The eastern margin and the central core of the train, outlined by the 10 wt.% isopleth, are both aligned with the last regional direction of ice flow. ...
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Journal Article
Journal: Geology
Published: 01 September 2003
Geology (2003) 31 (9): 821–824.
... at least 1500 m lower than today. Till deposition took place before 20 Ma on the basis of estimated past uplift rates. Antarctic Ice Sheet Transantarctic Mountains Sirius Group Mount Feather tillite Geological Society of America 2003 02 06 2003 01 04 2003 28 05 2003...
FIGURES
Journal Article
Published: 05 October 2009
Geological Magazine (2010) 147 (2): 281–298.
...-laboratory differences caused by variations in preparation methods were calibrated using the Crystallinity Index Standards (Warr & Rice, 1994 ). For other parameters, the precision, defined as the coefficient of variation (C = std.dev.*100/mean: Till, 1974 ) was established. Intra-locality error...
Journal Article
Published: 01 February 2017
Italian Journal of Geosciences (2017) 136 (1): 73–88.
... continental margin and it registers the evolution of the Neo-Tethys sea, from the pre-rift stage (Cambrian – Ordovician) to the final break-up of Gondwana in early Cretaceous and subsequent sedimentation till Eocene ( F uchs , 1967 ; G aetani & G arzanti , 1991 ; D upuis et alii , 2006 ; L iu...
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Journal Article
Published: 05 September 2003
Canadian Journal of Earth Sciences (2003) 40 (8): 1053–1070.
... inset shows isopleths on marine limit elevation after Grant ( 1989 a ) and radiocarbon-dated sample site locations outside the study area. TCH is the Trans-Canada Highway. It has been proposed that a short-lived readvance of Newfoundland ice at 12.6 Ka, the Robinsons Head readvance, interrupted...
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Series: Geological Society, London, Special Publications
Published: 01 January 2001
DOI: 10.1144/GSL.SP.2001.185.01.01
EISBN: 9781862394339
... at property scales. Fig. 8. Aerial photograph of part of Prince of Wales Island and Boothia Peninsula showing the distribution of carbonate-rich till (light-toned areas; carbonate isopleths shown). The location of a fomer ice stream extending eastward across Peel Sound is marked by a conspicuous plume...
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Journal Article
Journal: GSA Bulletin
Published: 07 June 2022
GSA Bulletin (2023) 135 (3-4): 547–574.
...: c—clay; s—silt; vfs—very fine sand; fs—fine sand; cs—coarse sand; p—pebble. Sedimentation rates vary throughout Yellowstone Lake based on linear regression analyses using tephra and radiocarbon ages ( Fig. 5 ). The sedimentation rates in the northern lake and West Thumb basin average ~1.06 m...
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Journal Article
Published: 11 June 2014
The Journal of Geology (2014) 122 (4): 411–432.
...-T domain for the assemblage Cld, Pl, Ms, Pg ± St (phase fields 3, 13) in b . Isopleths for X Fe in staurolite and chloritoid are shown for reference. d , Three-dimensional view of abundance of plagioclase (vol %) predicted in the P-T window (horizontal axes) shown in c . Volume...
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Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0038(07)
EISBN: 9780813756387
... end (7 km downstream, Stop 2-6) of ignimbrite (pf 1 ) deposit showing large pumice blocks and charred wood. (B) General outcrop shot of ignimbrite overlain by debris flow deposit (la) resulting from failure of natural dam. Figure 31. Main clast types present in the 2360 B.P. Pebble Creek...
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Journal Article
Journal: Geosphere
Published: 01 April 2013
Geosphere (2013) 9 (2): 191–215.
... ). Hudson (1955) confirmed the paleoflow direction in these reaches by observation of pebble imbrication and cross-bedding orientations. These reaches range in length from 2.4 to 11.5 km (consecutive uphill reaches combined) ( Hudson, 1955 ). The most significant uphill reach gains 66 m over a distance...
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Series: GSA Field Guide
Published: 03 May 2024
DOI: 10.1130/2024.0069(02)
EISBN: 9780813756691
... star in each reconstruction, is perfectly situated to provide crucial clues to these uncertainties. Inset (C) shows the Belt Basin region. Sr 87 /Sr 86 = 0.706 isopleth from Armstrong et al. (1977) . Background hillshade sourced from Esri online (and references within) available at http...
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...-bearing rocks in the mantle. Some suites, such as the <100 Ma Oregonian Sierran and Peninsular Ranges batholiths, have evolved Nd and Sr isotopes compatible with old enriched subcontinental lithospheric mantle. The well-known 0.706 87/86 Sr i isopleth appears to separate rocks of Oregonian slab...
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Series: Special Publications of the Society of Economic Geologists
Published: 01 January 2013
DOI: 10.5382/SP.17.03
EISBN: 9781629491639
... ). A ratio greater than 0.706 indicates melting or assimilation of older (Precambrian) crust or lithospheric mantle, whereas ratios lower than 0.704 reflects magma genesis in more juvenile, Phanerozoic crust or lithospheric mantle ( Armstrong, 1988 , p. 77). The 87 Sr/ 86 Sr isopleths shown on Figure 3...
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