1-20 OF 13115 RESULTS FOR

age revision

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
Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1992
DOI: 10.5382/GB.13
EISBN: 9781934969663
... of North America is one of the world's major continental rifts and hosts a variety of mineral deposits. The rocks and mineral deposits of this 2000 km long rift are exposed only in the Lake Superior region. In the Lake Superior region, the rift cuts across Precambrian basement terranes ranging in age from...
Journal Article
Journal: GSA Bulletin
Published: 01 July 1976
GSA Bulletin (1976) 87 (7): 961-968.
...RICHARD H. MILLER Abstract Abundant and diverse conodonts indicate age revisions or refinements for Upper Ordovician, Silurian, and Lower Devonian rocks in the southwestern Great Basin. Measured sections from the Inyo Mountains, northern Panamint Range, and Nopah Range in California and from...
Journal Article
Published: 01 June 2000
Canadian Journal of Earth Sciences (2000) 37 (6): 923-944.
... the calibration. A radiometric age database consisting of fifty U–Pb and 40 Ar/ 39 Ar ages was compiled to construct a revised Jurassic time scale. Accepted ages have a precision of ± 5 Ma (2σ) or better and are confined to no more than two adjacent stages. The majority of these calibration points result from...
Journal Article
Journal: The Leading Edge
Published: 01 November 2015
The Leading Edge (2015) 34 (11): 1382-1385.
... Corporation for his insightful revision and assistance with preparation of this article. Reflection-seismic data processing and refraction-tomography inversion can be applied on the same data set recorded in a single acquisition procedure. The weaknesses of one method are compensated...
Journal Article
Journal: GSA Bulletin
Published: 01 June 1993
GSA Bulletin (1993) 105 (6): 791-806.
... considered to be part of the 1.7 Ga Routt Plutonic Suite. New U-Pb zircon ages on four samples (granodiorite, monzogranite, and granite), however, indicate that the batholith was emplaced at 1,442 ± 2 Ma and belongs to the Berthoud Plutonic Suite. Most of the batholith has igneous textures and structures...
Journal Article
Journal: Geology
Published: 01 February 1985
Geology (1985) 13 (2): 149-153.
... of material eroded from the thrust-faulted margin of the Blacktail-Snowcrest foreland massif are middle Campanian ( Aquilapollenites senonicus Interval Zone; estimated absolute age 78–81 Ma). As a major consequence, the foreland buttress responsible for the shape of the southwestern Montana recess...
Journal Article
Journal: GSA Bulletin
Published: 01 August 1961
GSA Bulletin (1961) 72 (8): 1283-1284.
...ROBERT D MILLER; GLENN R SCOTT Abstract A radiocarbon age of 10,500±250 years B.P. (Before Present) from shell material near the base of a terrace along the North Loup River, Howard County, Nebraska, dates the alluvial sequence of silts and soils as late Wisconsin. The alluvium containing the shell...
Journal Article
Published: 01 January 1950
Geological Magazine (1950) 87 (1): 1-16.
Journal Article
Published: 01 June 1972
Journal of the Geological Society (1972) 128 (3): 295-305.
... Committee of the Geological Society of London presents a revision of its 1969 ‘Recommendations’ which is designed to provide a concise working guide to stratigraphical procedures. Le Comité de Stratigraphie de la Société Géologique de Londres presente une révision de ses ‘Recommendations’ de 1969 qui est...
Journal Article
Published: 01 June 2015
Italian Journal of Geosciences (2015) 134 (2): 255-265.
...-groundmass pairs of the upper stratigraphic units: Dome and massive Lava flows Complex (DLC) and Olivine Latitic final Lavas (OLF). The aim was twofold: to check the reliability of sanidine ages as geochronometer in these products, questioned in the literature, and to better define the chronology of the late...
FIGURES | View All (7)
Journal Article
Journal: AAPG Bulletin
Published: 01 April 1961
AAPG Bulletin (1961) 45 (4): 548-550.
... with a high Chesteran fauna. Thus the "Stenopora zone" is not Permian in age but Lower Pennsylvanian, and the "Plagioglypta canna zone" as shown by fusulinids is early Middle Pennsylvanian in age, not Permian. The Rocky Mountain group is divided into 3 formations. From the top down these are: the Ishbel...
Journal Article
Published: 01 March 1959
Journal of Paleontology (1959) 33 (2): 324-332.
...Derek Victor Ager Abstract The various families which have been proposed for Mesozoic rhynchonelloids are re-examined. The family Dimerellidae is revised and a new family and genus are proposed for the remarkable Rhaetic brachiopod 'Rhynchonella' cornigera (Schafhaeutl). Internal details are given...
Journal Article
Journal: PALAIOS
Published: 01 June 2016
PALAIOS (2016) 31 (6): 319-326.
... History Museum, Arusha, Tanzania, for logistical support, and the Stone Age Institute for financial contributions. E.G. Kauffman, C.E. Kauffman, and K. D. Nold are acknowledged for assistance with specimen analyses; J. Brophy for instruction in the Microprobe Laboratory, Indiana University, Bloomington...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 2018
AAPG Bulletin (2018) 102 (9): 1841-1865.
... the area of investigation. Biostratigraphic-marker and stacking-pattern analysis allowed for refining of stratigraphic calibration for key seismic surfaces. The Wornardt (1999) scheme was adopted for age dating, subdividing the whole succession into unconformity-bound sequences, which are comparable...
FIGURES | View All (28)
<b>Revised</b> <b>age</b> relationships of previously defined units (left) and <b>revised</b> st...
Published: 01 September 2002
Figure 2 Revised age relationships of previously defined units (left) and revised stratigraphy of central Transantarctic Mountains (right).
Journal Article
Published: 23 November 2016
Geological Magazine (2016) 155 (3): 685-706.
...LINDA PRINZ; TOM McCANN; ANDREAS SCHÄFER; SVEN ASMUS; PETER LOKAY Abstract The Cenozoic-age Lower Rhine Basin is located in the NW part of the European Cenozoic Rift System. In Miocene times, a combination of warm climatic conditions and basin subsidence resulted in the deposition of up to 100m...
FIGURES | View All (13)
Journal Article
Journal: GSA Bulletin
Published: 01 June 1998
GSA Bulletin (1998) 110 (6): 748-758.
...Daniel B. Karner; Fabrizio Marra Abstract Volcanic horizons interbedded with fluviodeltaic clastic sediments of the Tiber and Fosso Galeria River valleys near Rome provide a unique opportunity to date five middle Pleistocene fining-upward aggradational sections. 40 Ar/ 39 Ar ages from...
Journal Article
Published: 12 January 2015
The Canadian Mineralogist (2015) 52 (5): 873-882.
... and electron-microprobe analyses. Chemical data indicate the formulae [(Hg 4.61 Zn 0.38 Fe 0.04 ) Σ5.03 (Cu 1.03 Ag 0.04 ) Σ1.07 ] Σ6.10 (Cs 0.76 Tl 0.20 ) Σ0.96 (As 3.81 Sb 0.04 ) Σ3.85 S 12.06 (G), [(Hg 4.66 Zn 0.32 ) Σ4.98 (Cu 0.55 Ag 0.45 ) Σ1.00 ] Σ5.98 (Cs 0.74 Tl 0.06 ) Σ0.80 (As 3.42 Sb 0.56 ) Σ3.98 S...
Journal Article
Published: 01 June 2014
The Canadian Mineralogist (2014) 52 (3): 423-432.
... Te 9.84 , on the basis of 18 atoms. On the basis of information gained from the structural and chemical characterization, the crystal-chemical formula was revised, yielding Cu 5− x (Cu,Ag) 3+ x Te 10 ( Z 14) with x = 0.43 instead of Cu 7 AgTe 10 ( Z 16) as previously reported. TABLE 1 DATA...
FIGURES | View All (4)
Journal Article
Published: 01 January 2012
Rocky Mountain Geology (2012) 47 (1): 37-53.
... in the Picket Wire Canyonlands requires a revision of the stratigraphic assignment and our understanding of both the bone-bearing horizon and the underlying eolianite. Significantly, the eolianite cannot be of Jurassic age, because it is overlain by a unit bearing fossils of unambiguous Late Triassic age...
FIGURES | View All (5)