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Till-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...
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: 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.
... University Press Figure 1 Map showing the location of the Galway Bay–Clew Bay area within the major Caledonian terranes of the North Atlantic region (after Dewey & Shackleton, 1984 ). Very low-grade metamorphism remains more a qualitative than quantitative part of P–T space since...
Journal Article
Published: 01 February 2017
Italian Journal of Geosciences (2017) 136 (1): 73–88.
... of the Greater Himalayan Sequence ( Fig. 1 ). To the north the TSS is separated from the Lhasa block by the Yarlung Tsangpo Suture Zone and the top-to-the-north thrust (Great Counter thrust, Y in , 2006 ) gets it over the melange complex of the suture zone ( Fig. 1 ). Fig. 1 Schematic geological map...
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Journal Article
Published: 05 September 2003
Canadian Journal of Earth Sciences (2003) 40 (8): 1053–1070.
... eustatique variable du niveau de la mer, ajoutée à un déclin local de l’ajustement glacio-isostatique. [Traduit par la Rédaction] Results of surficial mapping on Port au Port Peninsula ( Batterson and Janes 1997 ; Batterson and Sheppard 2000 ) and reinterpretation of Late Wisconsinan deglacial...
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Journal Article
Journal: GSA Bulletin
Published: 07 June 2022
GSA Bulletin (2023) 135 (3-4): 547–574.
...., 1977 ) (Note: ka = 1000 years before 1950 CE). Subaerial deposits of explosion breccia around the craters are distinct in clast lithologies that reflect the subsurface geology below the crater ( Morgan et al., 2009 ). Figure 1. Color-shaded bathymetric map of Yellowstone Lake, Wyoming, USA...
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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
... record, especially empirical field evidence for ice flow and drift composition. It has been largely acquired through federal and provincial surveys, and includes hundreds of thousands of geochemical, mineralogical, and lithological till analyses. Maps of surficial geology and drift composition portray...
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Journal Article
Published: 11 June 2014
The Journal of Geology (2014) 122 (4): 411–432.
... the NIB and the SIB came into existence during this ∼1.0 Ga global tectonic episode. Figure 1. Tectonic map of peninsular India showing the important crustal domains and the inferred location of the Central Indian Tectonic Zone (CITZ). Precambrian domains (unless specified) are shown with white...
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Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0038(07)
EISBN: 9780813756387
... summit, Plinth to the right (north), and Capricorn and Pylon to the left (south) of Meager. The vent to the 2360 B.P. eruption is situated immediately below and to the north of Plinth Peak. Figure 21. Simplified geological map showing the distribution of Pebble Creek Formation units...
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Journal Article
Journal: Geosphere
Published: 01 April 2013
Geosphere (2013) 9 (2): 191–215.
... mm/yr or more) or the continuation of en echelon Frontal faults across the crest are shown. Also shown on the map are the depths (magenta numbers) of paleochannels, which are Eocene–Oligocene with the exception of the Miocene paleo–San Joaquin River; and late Cenozoic incision recorded in modern...
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Series: GSA Field Guide
Published: 03 May 2024
DOI: 10.1130/2024.0069(02)
EISBN: 9780813756691
... will address the early historic economic geology and original mapping of these Proterozoic sequences in the northeastern Washington region, and from that foundation explore more recent isotopic provenance data and their regional to global context. Finally, the guide will end with a discussion of remaining...
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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
... orogenic events have imparted a tectonic grain to the cratonic basement that is well imaged in the regional aeromagnetic map of western Canada (Fig. 3 ). At the Cordilleran deformation front, prominent structural trends in the cratonic basement are mainly northeasterly and at a high angle...
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