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Agassiz Rock

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Journal Article
Journal: Economic Geology
Published: 01 May 1991
Economic Geology (1991) 86 (3): 588-599.
...; and clastic sedimentary rocks. En echelon shear zones with accompanying carbonatization, silicification, and chloritization occur throughout the stratigraphy. The stratigraphic sequence that characterizes the Agassiz metallotect hosts five known gold deposits including the MacLellan Au-Ag deposit...
Journal Article
Journal: GSA Bulletin
Published: 01 November 2005
GSA Bulletin (2005) 117 (11-12): 1481-1496.
...Timothy G. Fisher Abstract Glacial Lake Agassiz, a large Pleistocene lake, left behind strandlines at multiple elevations within its basin. Prior researchers have used these strandlines to identify four relatively stable water level stages, but tracing them over long distances is often problematic...
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Journal Article
Published: 01 January 1976
Canadian Journal of Earth Sciences (1976) 13 (1): 27-43.
... of the lake.The oldest offshore deposit of Lake Agassiz (Unit 1) is a silty clay containing ice-rafted clasts of till, clayey silt, and rock. Most of the silty and sandy sediment of the Assiniboine Delta also was deposited at this time. A readvance of ice into the northern and eastern Lake Agassiz basin, about...
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(17)
EISBN: 9780813756240
...–11410 AMS Rock ( 2009 ) Fargo-UPC 9849 ± 57 11206–11287 AMS 1 Using CALIB 6 Stuiver et al. ( 1998 ) and the Reimer et al. ( 2009 ) dataset. AMS—accelerator mass spectrometry. Figure 3. Lake phase diagram for Lake Agassiz at the southern outlet. Modified from Fisher ( 2005...
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Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(15)
EISBN: 9780813756240
... for the deepwater sculpin to be distributed this way (Fig. 5 ). The Steep Rock moraine was from a mid-YD readvance that obliterated some of the northern Ontario evidence for early Lake Agassiz overflows to the Superior basin, but not in northeastern Minnesota. The field guide and trip explores, analyzes...
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Journal Article
Published: 25 September 2003
Canadian Journal of Earth Sciences (2003) 40 (9): 1259-1278.
...David W. Leverington; James T. Teller Abstract Paleotopographic reconstructions of the eastern outlets of glacial Lake Agassiz provide a foundation for understanding the complex manner in which terrain morphology controlled the routing of overflow through the eastern outlets during the lake’s...
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Journal Article
Published: 11 September 2000
Canadian Journal of Earth Sciences (2000) 37 (10): 1335-1353.
...A.F. Bajc; D.P. Schwert; B.G. Warner; N.E. Williams Abstract Mapping of Quaternary geology in the Rainy River lowland, northwestern Ontario resulted in discovery of several fossil-bearing localities. Organic remains are associated with both the Moorhead and Emerson phases of glacial Lake Agassiz...
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Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP287.20
EISBN: 9781862395350
... On his voyage to America aboard the Sylvie de Grasse from Le Havre in March 1847, Desor was accompanied by Charles Girard (Fig.  5 ). Girard, then in his mid-twenties, was of peasant stock from Upper Alsace. His parents had some connection with the Agassiz family, and as a teenager he had come...
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Journal Article
Journal: GSA Bulletin
Published: 27 July 2017
GSA Bulletin (2017) 130 (1-2): 3-23.
...) radiocarbon dates from six sediment cores in the basin were used to interpret the Holocene paleoenvironmental history of Lake of the Woods, including the late history of glacial Lake Agassiz. Sediments cored consist mainly of lacustrine silty clay to clayey silt. A distinct pink lamina in one core...
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Journal Article
Journal: Geology
Published: 04 January 2018
Geology (2018) 46 (2): 155-158.
... the last deglaciation. This climatic event was hypothesized to have been caused by a change in glacial Lake Agassiz (north-central North America) overflow from its routing to the Gulf of Mexico to an easterly route to the North Atlantic due to Laurentide ice-sheet retreat from the Lake Superior basin...
FIGURES
Journal Article
Published: 01 March 2010
Journal of Paleontology (2010) 84 (2): 248-266.
...MARTIN A. BECKER; ROBERT W. WELLNER; CHRISTOPHER S. MALLERY, Jr; JOHN A. CHAMBERLAIN, Jr Abstract The Lower Ferron Sandstone Member of the Mancos Shale in southeastern Utah preserves a chondrichthyan assemblage of at least 13 taxa that include: Hybodus sp., Ptychodus cf. P. mammillaris Agassiz...
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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP430.17
EISBN: 9781862399624
... to South Kensington, the collections already contained many fossil fish specimens first described and figured by the famous Swiss zoologist and geologist Louis Agassiz in his monumental work Recherches sur les Poissons Fossiles . The fabulous fossil fish collections of Lord Egerton and the Earl...
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Journal Article
Published: 01 January 1980
Canadian Journal of Earth Sciences (1980) 17 (1): 19-35.
... the Precambrian Shield and deposited the sandy Whiteshell and Senkiw tills, which contain abundant Precambrian rock fragments and minerals and few Paleozoic carbonate grains. Shortly after this, Keewatin ice advanced from the northwest over Paleozoic carbonate rocks, depositing the loamy carbonate-rich Roseau...
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(14)
EISBN: 9780813756240
..., and laid down a finer-grained till due to incorporation of proglacial lake sediment. There are three distinct tills, which are correlated to three readvance phases: the St. Croix/Automba, Split Rock, and Nickerson. A red clay typically caps the stratigraphy at lower elevations in the basin. This clay may...
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Journal Article
Journal: Geosphere
Published: 26 January 2018
Geosphere (2018) 14 (2): 642-650.
... acceptance. This investigation examined whether an earlier proposal of climate change in the history of science could facilitate climate literacy in modern climate discussions. Louis Agassiz’s 1837 glacial theory proposal was received with initial skepticism, heavily debated, and eventually accepted...
FIGURES
Journal Article
Published: 15 April 2018
Journal of Paleontology (2018) 92 (4): 611-633.
... a dozen species have been identified as Homomya Agassiz, order Pholadomyida, superfamily Pholadomyoidea or Pleuromya Agassiz, order Pholadida, superfamily Pleuromyoidea. Because valve morphologies of the two genera are similar in many ways, casts are difficult to separate. Statistical analysis of key...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP414.6
EISBN: 9781862397156
... We wish to thank the staff at Institute for Rock Magnetism, the National Lacustrine Core Facility (LacCore), and the St Croix Watershed Research Station for instrumental expertise. The Minnesota Pollution Control Agency provided logistical support for collecting the sediment core. We thank...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 1895
GSA Bulletin (1895) 7 (1): 255-314.
...John C. Branner Abstract Introduction. In writing of Brazil, Louis Agassiz * says that— “The decomposition of the surface rocks to the extent to which it takes place is very remarkable, and points to a new geological agency thus far not discussed in our geological theories. It is obvious here...
Series: DNAG, Geology of North America
Published: 01 January 1988
DOI: 10.1130/DNAG-GNA-D2.221
EISBN: 9780813754499
... portion of the Williston Basin. Glacial or Cenozoic continental deposits mask much of the basin geology. Paleozoic and Mesozoic rocks are exposed infrequently along the basin margin. Therefore, virtually all of the knowledge of this basin is from subsurface geologic data, including cores, samples, well...
Series: AAPG Studies in Geology
Published: 01 January 2004
DOI: 10.1306/St49974C4
EISBN: 9781629810508
... scientific minds to develop the theories of atoll formation (Darwin, 1842; Agassiz, 1903). The low-lying atolls, however, provided little clue about the history of the Maldives beyond the Holocene. This situation changed when oil companies became interested in the hydrocarbon potential of the Maldives. From...