1-20 OF 216 RESULTS FOR

gunflint

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Journal: Geology
Published: 17 April 2020
Geology (2020) 48 (7): 688–692.
...Birger Rasmussen; Janet R. Muhling Abstract The 1.88 Ga Gunflint Formation in Ontario, Canada, has played a key role in the development of current models for the deposition of iron formations. The presence of hematite-rich iron formation intercalated with chert stromatolites containing purported...
FIGURES | View All (4)
Journal Article
Published: 19 November 2019
Canadian Journal of Earth Sciences (2020) 57 (8): 947–953.
...Sadie Fischer; Philip Fralick The Gunflint Formation of northwestern Ontario, Canada, contains an extensive array of stromatolite morphologies and associated fossilized bacteria. It, and correlative units in the United States, provided some of the most persuasive early interpretations...
FIGURES | View All (5)
Journal Article
Journal: Geology
Published: 20 August 2019
Geology (2019) 47 (10): 899–903.
... leaves a trace, so evidence for this process in the early Precambrian rock record is sparse. Here, we report the widespread presence of solidified oil (pyrobitumen) in the iron formation of the 1.88 Ga Gunflint Formation, Ontario, Canada. Petrographic textures indicate at least two phases of oil...
FIGURES | View All (4)
Journal Article
Published: 19 July 2002
Canadian Journal of Earth Sciences (2002) 39 (7): 1085–1091.
...Philip Fralick; Don W. Davis; Stephen A. Kissin Abstract The Gunflint Formation, a Paleoproterozoic chemical–clastic sedimentary assemblage outcropping to the immediate northwest of Lake Superior, became famous in 1954 as containing the oldest fossil assemblage known at that time. Older...
FIGURES | View All (4)
Journal Article
Published: 21 July 2000
Canadian Journal of Earth Sciences (2000) 37 (9): 1229–1243.
...M.G. Sommers; S.M. Awramik; K.S. Woo Abstract The chert members of the Paleoproterozoic Gunflint Formation, Ontario, Canada, are commonly regarded as examples of primary silica chemical sediments. This interpretation is founded upon the ubiquitous nature of silica, high fidelity of preservation...
FIGURES | View All (6)
Journal Article
Published: 01 December 1992
Canadian Journal of Earth Sciences (1992) 29 (12): 2610–2616.
...B. I. Kronberg; P. W. Fralick Abstract Alteration of ferromagnesian minerals in felsic Archean rocks apparently was accomplished by diffusion of Gunflint Formation-derived fluids across the Proterozoic–Archean contact. The geochemical evidence documented here is consistent with slow mineral–fluid...
Series: DNAG, Centennial Field Guides
Published: 01 January 1987
DOI: 10.1130/0-8137-5403-8.47
EISBN: 9780813754093
... Abstract The Seagull Lake-Gunflint Lake area along the Gunflint Trail (Cook County Highway 1) in T. 65N., R. 3 and R. 4W. in the northwestern part of Cook County, Minnesota (Fig. 1) is north of Grand Marais, the county seat and starting point for the Gunflint Trail. Although accessible...
Journal Article
Journal: Economic Geology
Published: 01 May 1983
Economic Geology (1983) 78 (3): 502–506.
Journal Article
Journal: Economic Geology
Published: 01 February 1983
Economic Geology (1983) 78 (1): 175–180.
Journal Article
Published: 01 February 1981
American Mineralogist (1981) 66 (1-2): 70–86.
Journal Article
Published: 01 March 1979
Canadian Journal of Earth Sciences (1979) 16 (3): 484–495.
...Stanley M. Awramik; M. A. Semikhatov Abstract The microstructure in three silicified morphologically distinct and vertically intergrading stromatolites from the Aphebian (~2 Ga old) Gunflint Iron Formation of Ontario, Canada was found to be different for each stromatolite morphology studied; each...
Journal Article
Published: 01 September 1978
Journal of Paleontology (1978) 52 (5): 976–992.
Journal Article
Journal: GSA Bulletin
Published: 01 September 1975
GSA Bulletin (1975) 86 (9): 1169–1190.
...R. J. FLORAN; J. J. PAPIKE Abstract The relatively unmetamorphosed middle Precambrian Gunflint Iron-Formation of Ontario has undergone considerable post-depositional recrystallization and locally intense replacement. Although these tend to obscure primary textural-mineralogical relations, textural...
Journal Article
Journal: GSA Bulletin
Published: 01 October 1974
GSA Bulletin (1974) 85 (10): 1595–1596.
...DAVID G. DARBY Abstract Chert of the middle Precambrian Gunflint Iron-Formation (ca. 1.9 b.y. old) from near Schreiber, Ontario, Canada, has yielded some of the oldest well preserved cellular remains yet known. Observation of the spherical unicellular forms has indicated two methods of reproduction...
Journal Article
Published: 01 May 1971
Journal of Paleontology (1971) 45 (3): 522–524.
Journal Article
Journal: GSA Bulletin
Published: 01 September 1969
GSA Bulletin (1969) 80 (9): 1725–1736.
...GUNTER FAURE; JACK KOVACH Abstract A Rb-Sr isochron age of 1635 ± 24 m.y. was obtained for whole-rock samples from the Gunflint Iron Formation and the Rove Formation in Ontario, using a value of 1.39 × 10 −11 yrs −1 for the decay constant of Rb 87 . This date may be interpreted as being...
Journal Article
Journal: Economic Geology
Published: 01 December 1966
Economic Geology (1966) 61 (8): 1336–1361.
...D. T. A. Symons Abstract One hundred and eleven samples of Animikie iron formation, partially altered iron formation, and direct-shipping iron ore were collected from the Gunflint, Mesabi, and Cuyuna Ranges in the Lake Superior region of North America. Paleomagnetic measurements were made...
Journal Article
Journal: AAPG Bulletin
Published: 01 April 1964
AAPG Bulletin (1964) 48 (4): 518.
...S. M. A. Boutcher; W. W. Moorhouse The iron silicate minerals from more than 50 specimens of the Proterozoic Gunflint Iron formation, near Port Arthur, Ontario, were identified by X-ray powder methods and microscopic techniques. There appears to be a geographical and possibly a stratigraphical...
Journal Article
Journal: Economic Geology
Published: 01 May 1958
Economic Geology (1958) 53 (3): 349–351.
Journal Article
Journal: Economic Geology
Published: 01 June 1957
Economic Geology (1957) 52 (4): 458–461.