manicouagan impact

[29], Other Triassic craters are closer to the Triassic–Jurassic boundary but also much smaller than the Manicouagan reservoir. Grieve, R. A. F., and Floran, R. J. Journal of Geophysical Research, Supplement, 88, 807–818. U.S. Geological Survey Astrogeologic Studies Annual Progress Report, July, 71–78. [5] However, it is likely that many other groups survived up until the boundary according to British fissure deposits from the Rhaetian. Journal of Geophysical Research, 98, 14–321.

Meteoritics & Planetary Science, 16, 320–321. This should be the age of the end-of-Triassic mass extinction that paleontology and sedimentation rates suggest occurred less than 1 m.y. 13th Lunar and Planetary Science Conference, abstract #1090, 174–175, 1984. The last known metoposaurids ("Apachesaurus") were from the Redonda Formation, which may have been early Rhaetian or late Norian. Gravity study of great impact. 11th Lunar and Planetary Science Conference, abstract #1012. Some aspects of the Manicouagan Lake structure in Quebec, Canada. Fission track dating of some impact craters in the age range between 6,000y and 300 m.y. Princeton University, Princeton, NJ, 38 p. Shepard, J. * pre-1977 K-Ar, Ar-Ar and Rb-Sr ages recalculated using the decay constants of Steiger and Jager (1977) Ages in millions of years (Ma) before present. Precambrian Research, 130, 199–228. McHone, J.G. Quan, B. van de Schootbrugge, M.P. Meteoritika, 40, 113–121.

Spray, J. G. 1994. Please click on the PDF icon to access. [7] Olson (1987) estimated that 42% of all terrestrial tetrapods went extinct at the end of the Triassic, based on his studies of faunal changes in the Newark Supergroup of eastern North America. Wolfe, S. H. 1971. (U–Th)/He dating of terrestrial impact structures: The Manicouagan example. Phinney, W. C., Dence, M. R., and Grieve, R. A. F. 1978. Zemlya I Vselennaya, 3, 56–64. The Triassic-Jurassic boundary and the Manicouagan impact: implications of the 40Ar/39Ar dates on periodic extinction models. [11], Mass extinction ending the Triassic period. [27] Onoue et al. Zotkin, I. T. 1969. “Moon” craters on the Earth (in Russian). Shatter cones in cryptoexplosion structures. 2. Thesis, Princeton University, Princeton, NJ, 38 p. 1986. [6] Nevertheless, a pronounced turnover in plant spores and a collapse of coral reef communities indicates that an ecological catastrophe did occur at the Triassic-Jurassic boundary. Today Lake Manicouagan

Like a pebble creating ripples when dropped into water, the crater has concentric rings formed by shock waves transmitted by the impact. Dressler, B. O. Van Soest, M. C., Hodges, K. V., Wartho, J.

Meteoritic material at five large impact craters. Field, "Nitrogen isotope and trace metal analyses from the Mingolsheim core (Germany): Evidence for redox variations across the Triassic–Jurassic boundary", The extinction of conodonts — in terms of discrete elements — at the Triassic–Jurassic boundary, "Assessing the record and causes of Late Triassic extinctions", "Origination, extinction, and mass depletions of marine diversity", 10.1666/0094-8373(2004)030<0522:OEAMDO>2.0.CO;2, "Tetrapod Extinctions at the End of the Triassic Period", "New early Jurassic tetrapod assemblages constrain Triassic–Jurassic tetrapod extinction event", "Evidence for a late Triassic multiple impact event on Earth", "Zircon U-Pb Geochronology Links the End-Triassic Extinction with the Central Atlantic Magmatic Province", "The Geological Record of Ocean Acidification", "Recognising ocean acidification in deep time: An evaluation of the evidence for acidification across the Triassic-Jurassic boundary", "A subseafloor carbonate factory across the Triassic-Jurassic transition", "Permian–Triassic Osteichthyes (bony fishes): diversity dynamics and body size evolution", "Resetting the evolution of marine reptiles at the Triassic–Jurassic boundary", "A new crurotarsan archosaur from the Late Triassic of South Wales", "The age, fauna and palaeoenvironment of the Late Triassic fissure deposits of Tytherington, South Gloucestershire, UK", "Did the Manicouagan impact trigger end-of-Triassic mass extinction?

Land. Some paleontologists have considered only phytosaurs and procolophonids to have gone extinct at the Triassic-Jurassic boundary, with other groups having gone extinct earlier.

Petrogenesis of melt rocks, Manicouagan impact structure, Quebec. Floran, R. J. The crater is a multiple-ring structure about 100 km (60 mi) across. The lake is bounded by erosion-resistant Endeavour's Remote Manipulator System (RMS) and the newly installed Space Station

[34][35][36] Evidence for ocean acidification as an extinction mechanism comes from the preferential extinction of marine organisms with thick aragonitic skeletons and little biotic control of biocalcification (e.g., corals, hypercalcifying sponges). The impact that formed Manicouagan is thought to have occurred about Budkewitsch, P., and Grieve, R. 1997. MODIS R: band 1 (620-670nm), G: band 2 (841-876nm), B: band 1 April, 2001 - submitted by Chuck Simonds, 5. Cockell, C. S., and Lee, P. 2002. Floran, R. J., and Dence, R. J. (MISR’s) nadir (vertical-viewing) camera on June 1, 2001. Sweeney, J. F. 1978. The Manicouagan reservoir in Quebec, a massive crater formed by a Late Triassic impact. Journal of Geophysical Research, 76, 5552–5565. The central uplift of the Manicouagan impact structure, Ph.D. Thesis. The age of the Triassic/Jurassic boundary is provided by zircons from the North Mountain Basalt of the Newark Supergroup of Nova Scotia; the zircons yield a U-Pb age of 202 ±1 Ma. However, the effect of such processes on Triassic animal and plant groups is not well understood. Impact and volcanism: A momentum scaling law for erosion. hydroelectric The structure of meteorite craters and their central uplifts (in Russian). Lake Jänisjärvi is a roughly oval-shaped lake, some 13 by 17 kilometers (8 by 11 miles) across, in northwestern Russia, near the Finnish border. Manicouagan Reservoir: the lake is the combined product of one of the largest known impacts on Earth, the subsequent ice ages, and agigantic retention dam. Dence, M. R. 1977. Image of the Day Thesis. Crustal architecture above the high-pressure belt of the Grenville Province in the Manicouagan area: new structural, petrologic and U-Pb age constraints. abundant in the target rocks of the crater floor. The Manicouagan impact structure: An analysis of its original dimensions and form. Glaciation and other erosional processes have reduced the extent of the crater, with the original diameter estimated at about 100 kilometers. Lake Manicouagan in northern Quebec, Canada, surrounds the central uplift of the impact structure, which is about 70 kilometers in diameter and is composed of impact-brecciated rock. Some peculiarities of selective evaporation in target rocks after meteoritic impact. Scott, R. G., Grieve, R. A. F., and Pilkington, M. 1996. Borning, J., Floran, R. J., and Simonds, C. H. 1975. The basin for this lake was formed hundreds of millions of years ago by a meteorite impact. The Manicouagan impact structure as a terrestrial analogue site for lunar and martian planetary science. Fel’dman, V. I., Sazonova, L. V., and Granovsky, L. B. Meteoritics & Planetary Science, 27, 299–300. Geological Society of America, 190, 25–37.

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