In the 1940s, the USGS sent geologist Cederstrom to hunt for water to support the region's 1–20., Griscom D. L. (2001) Possible identification of proximal ejecta from the Upper-Eocene Chesapeake Bay crater (abstract), European Science Foundation: Impact Programme, 6th ESF-IMPACT Workshop, Granada, Spain, 35., Griscom D. L. (2002) Is Washington DC built on ejecta deposits of the upper-Eocene Chesapeake Bay Crater? Asteroid impact date: Estimated 35 million years ago. 819-833. "Chesapeake Bay Impact Structure - 35 Million Years After - and Still Making An Impact." … 8, pp. "Our results demonstrate the uranium-thorium-helium dating method's viability for use in similar cases, where shocked materials were ejected away from the crater and then allowed to cool quickly, especially in cases where the sample size is small.". Lee S. R., Horton Jr. J. W., Walker R. J. McDonald I., Bartosova K., Koeberl C. (2009) Search for a meteoritic component in impact breccia from the Eyreville core, Chesapeake Bay impact structure: Considerations from platinum group element contents, Special Paper of the Geological Society of America, Issue 458, pp. THE CHESAPEAKE BAY METEOR A mystery, meteors and one man's quest for the truth Story by DIANE TENNANT ; graphics by MICHAEL HALL © June 24, 2001, The Virginian-Pilot Graphic: Waves of destruction The meteor, two miles wide, crossed paths with Earth at 76,000 miles per hour, 1,266 miles per minute. Meteoritics and Planetary Science, Volume 31, Issue 2, pp. Thirty-five million years ago, a meteorite three miles wide and moving sixty times faster than a bullet slammed into the sea bed near what is now Chesapeake Bay. This section, which is included for each crater on this website, is not an exhaustive list of such published evidence, but is meant to demonstrate that appropriate work has been done for each listing. National Oceanic and Atmospheric Administration . Waves 1 ft or less. 2015, Christoph Kersten / GEOMAR 3, pp. Tides for Chesapeake Beach, Chesapeake Bay, MD. Timing of the impact is relatively well constrained by multiple studies, to 35.3 to 35.4 Ma (e.g. Imagine a direct hit from a cosmic object around 300 times the size of the Siberian one, and you can begin to appreciate the impact of the ancient meteor that struck what is now the mouth of the Chesapeake Bay. 218-226. doi. Geological Society of America, Abstracts with Programs, Volume 28, No. Boulder, Colorado: Geological Society of America. Biren then identified and processed shocked zircon fragments for imaging and chemical analysis with an electron microprobe. "Distribution, Origin, and Resource-Management Implications of Ground-Water Salinity Along the Western Margin of the Chesapeake Bay Impact Structure in Eastern Virginia." SAT S winds 5 to 10 kt. 2005, pp. Geology, Volume 30, No. Your opinions are important to us. googletag.cmd.push(function() { googletag.display('div-gpt-ad-1449240174198-2'); }); While the resulting "Chesapeake Bay impact crater" is now completely buried, it was discovered in the early 1990s by scientific drilling. Boulder, Colorado: Geological Society of America. (2009) to about 85 km diameter, with a ~40 km diameter central uplift. An asteroid or huge chunk of ice slammed into Earth about 35 million years ago, splashing into the Early Cretaceous North Atlantic, sending tsunamis as far as the Blue Ridge Mountains and leaving a 56-mile-wide hole at the mouth of what is now the bay. We do not guarantee individual replies due to extremely high volume of correspondence. When the asteroid struck the Earth, it is said to have caused a dizzying wave of water that reached 1,500 feet in height . "Recent Research on the Chesapeake Bay Impact Structure, USA - Impact Debris and Reworked Ejecta." Edited by J. W. Horton, Jr., D. S. Powars, and G. S. Gohn. “But that asteroid still had a major effect on the ground, and there are potentially millions of them,” Mazanek said. This computer simulation illustrates how an asteroid contributed to the formation of the Chesapeake Bay impact crater. Waves 2 ft. FRI NIGHT W winds 5 to 10 kt. "In recent years, for example, the scientific community has realized the importance of impact events on Earth's geological and biological history, including the 65 million years old dinosaur mass extinction event that is linked to the large Chicxulub impact crater.". This volume represents an approximate size of the Dead Zone in the Bay. In The ICDP-USGS Deep Drilling Project in the Chesapeake Bay Impact Structure: Results from the Eyreville core holes, edited by Gohn G. S., Koeberl C., Miller K. G., and Reimold W. U. GSA Special Paper 458. 469-479. 349–376., Wittmann A., Schmitt R. T., Hecht L., Kring D. A., Reimold W. U., Povenmire H. (2009) Petrology of impact melt rocks from the Chesapeake Bay crater, USA. Included Area. An asteroid or huge chunk of ice slammed into Earth about 35 million years ago, splashing into the Early Cretaceous North Atlantic, sending tsunamis as far as the Blue Ridge Mountains and leaving a 56-mile-wide hole at the mouth of what is now the bay. When the asteroid hit, it also produced an impact ejecta layer, which includes tektites (natural glass formed from debris during meteorite impacts) and shocked zircon crystals which were thrown out of the impact area. Geological Society of America Abstracts with Programs, Volume 26, p. A—152.. Some 35 million years ago, … Its impact formed a 25-mile diameter crater that now lies buried beneath the Chesapeake Bay, an estuary in Virginia and Maryland. Chesapeake Bay Mobjack Bay and York River Entrance . 377–396., http://geology.er.usgs.gov/eespteam/crater/, Fernandes et al., 2012, abstract  http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1775.pdf, Fernandes et al., 2014 http://www.hou.usra.edu/meetings/lpsc2014/pdf/1274.pdf, http://pubs.usgs.gov/pp/2005/1688/ak/PP1688_chapA.pdf, https://gsa.confex.com/gsa/2002AM/finalprogram/session_2233.htm, https://gsa.confex.com/gsa/2004AM/finalprogram/abstract_79601.htm. (1993) The Chesapeake Bay “impact crater”; Stratigraphic and seismic evidence (abstract). pp. 37° 16.014′ N, 76° 1.396′ W. Marker is in Cape Charles, Virginia, in Northampton County. European Science Foundation: Impact Programme. Reston, Virginia: U.S. Geological Survey, open-file report 2004-1016. http://pubs.usgs.gov/of/2004/1016/2004-1016.pdf, Edwards L. E., Powars D. S. (2003) Impact Damage to Dinocysts from the Late Eocene Chesapeake Bay Event. Get weekly and/or daily updates delivered to your inbox. 13 Seismic imagery reveals a near circular crater as deep as Grand Canyon and encompassing an area twice that of Rhode Island. Tectonic forces lifted (Image credit: USGS) The flooded valleys became the major modern estuaries, like Delaware Bay and Chesapeake Bay. That meteor was about 17 meters (56 feet) in diameter when it exploded about 23 kilometers (14.3 miles) above the Earth. A chance of showers. Specs: Discovered in the early 1980s, the Chesapeake Bay Crater is located approximately 125 miles (201 kilometers) from Washington, D.C. By using our site, you acknowledge that you have read and understand our Privacy Policy Boulder, Colorado: Geological Society of America. Meteoritics and Planetary Science, Volume 41, Issue 5, pp. B., Daniels D. L., and Shah A. K. (2009) Gravity investigations of the Chesapeake Bay impact structureGeological Society of America Special Papers, Volume 458, p. 181-193, doi:10.1130/2009.2458(09), http://specialpapers.gsapubs.org/content/458/181.abstract, Poag C. W. (1996) Structural outer rim of Chesapeake Bay impact crater - Seismic and borehole evidence. 417–420. (abstract), European Science Foundation: Impact Programme, ESF-IMPACT Workshop, 9th, Prague, Czechoslovakia, 23.. "Studies of the Chesapeake Bay Impact Structure - The USGS-NASA Langley Corehole, Hampton, Virginia, and Related Coreholes and Geophysical Surveys." This document is subject to copyright. Results from a Scientific Test Hole in the Central Uplift, Chesapeake Bay Impact Structure, Virginia, USA [Abstract]: Lunar and Planetary Science Conference XXXVI, Abstract 2003, 2005c, p. 2., Horton Jr. J. W., Gohn G. S., Powars D. S., Edwards L. E. (2007) Origin and emplacement of impactites in the Chesapeake Bay impact structure, Virginia, USA, Geological Society of America Special Papers, Volume 437, pp. ANZ531-230800- Chesapeake Bay from Pooles Island to Sandy Point- 1127 PM EDT Thu Apr 22 2021 REST OF TONIGHT W winds 15 kt with gusts to 20 kt. The Chesapeake Bay impact was a dramatic event, but the Chicxulub crater was formed by an impactor perhaps 2-3 times larger. (2009) to about 85 km diameter, with a ~40 km diameter central uplift. An ancient ocean makes up the Piedmont province. If your research leads you to additional scientific references related to this crater, please help improve this resource by sending a note with the new citation(s) to: robert@impactcraters.us ), Bartosova K., Ferrie´re L., Koeberl C., Reimold W. U., and Gier S. (2009) Petrographic and shock metamorphic studies of the impact breccia section (1397–1551 m depth) of the Eyreville drill core, Chesapeake Bay impact structure, USA. 147-170. The impact, more powerful than the combined explosion of every nuclear bomb on Earth, blasted out … Its impact formed a 25-mile diameter crater that now lies buried beneath the Chesapeake Bay, an estuary in Virginia and Maryland. 73–97, doi:10.1130/2008.2437(06), http://specialpapers.gsapubs.org/content/437/73.abstract, Horton, J.W., Jr., and Izett, G.A., 2005; Crystalline-rock ejecta and shocked minerals of the Chesapeake Bay impact structure, USGS-NASA Langley Core, Hampton, Virginia, with supplemental constraints on the age of the impact, in Horton et al., Editors, Studies of the Chesapeake Bay Impact Structure—The USGS-NASA Langley Corehole, Hampton, Virginia, and related Coreholes and Geophysical Surveys, USGS Prof. Paper 1688. ), 2009. The Chesapeake Bay crater is an 85 km impact structure formed during the late Eocene, about 35.4 million years ago. Copyright 2011, 2012, 2013, 2014, 2015, 2016 United States Meteorite Impact Craters. (2006) Confirmation of a meteoritic component in impact-melt rocks of the Chesapeake Bay impact structure, Virginia, USA - Evidence from osmium isotopic and PGE systematics, Meteoritics and Planetary Science, Volume 41, issue 6, pp. It takes six days for water to flow from the farthest corner of the watershed—the head or source waters of the Susquehanna River in New York—to Havre de Grace, Maryland, where it empties into the Chesapeake. Location: Virginia, United States. Geology, Volume 33, pp. Use GORE TENARA Sewing Thread for seams that last. K1-K32., McDonald I., Bartosova K., Koeberl C. (2009) Search for a meteoritic component in impact breccia from the Eyreville core, Chesapeake Bay impact structure: Considerations from platinum group element contents, Special Paper of the Geological Society of America, Issue 458, pp. GSA Special Paper 458. Geological Society of America Abstracts with Programs, Southeastern Section meeting, March 30-31, 1998., Koeberl C., Poag C. W., Reimold W. U., Brandt D. (1996) Impact origin of the Chesapeake Bay structure and source of the North American tektites. Scientists estimate the amount of hypoxia in the Chesapeake Bay using a metric called the "hypoxic volume," which is the volume of water in the Bay with a dissolved oxygen concentration less than 2 milligrams per liter (mg/L). pp. Meteoritics and Planetary Science, Volume 31, Issue 2, pp. Griscom D. L. (2007) Chesapeake Bay crater ejecta are alive and well and living in Maryland. The Chesapeake Bay Crater impact site was formed more than 35 million years ago by a comet or asteroid 5 to 8 miles (8 to 13 kilometers) in diameter. As happened with the Chesapeake Bay crater, sediments also covered the site of the Chicxulub crater, burying it partially under the Yucatan peninsula in Mexico. You can be assured our editors closely monitor every feedback sent and will take appropriate actions. The Chesapeake Bay Retriever should have an intelligent expression. In The ICDP-USGS Deep Drilling Project in the Chesapeake Bay Impact Structure: Results from the Eyreville core holes, edited by Gohn G. S., Koeberl C., Miller K. G., Reimold W. U. Geological Society of America Special Paper 458. The Chesapeake Bay watershed includes six different geologic areas, called physiographic provinces: Continental Shelf, Coastal Plain, Piedmont, Blue Ridge, Valley and Ridge, and Appalachian Plateaus. It is now completely covered by younger sediments, but was discovered in the early 1990s by marine geophysical surveys and subsequent drilling. C, Chou I-M (2009) Evolution of crystalline target rocks and impactites in the Chesapeake Bay impact structure, ICDP-USGS Eyreville B coreGeological Society of America Special Papers, Volume 458, p. 277-316, doi:10.1130/2009.2458(14), http://specialpapers.gsapubs.org/content/458/277.abstract, Horton, J. W., Jr., D. S. Powars, and G. S. Gohn, eds. 275-285., http://palaios.geoscienceworld.org/content/18/3/275.abstract, Elbra T., Kontny A., Pesonen L. J. (1994) Virginia's coastal plain inland salt water wedge - A geohydrological response to the Chesapeake Bay bolide impact (abstract). Imagine a direct hit from a cosmic object around 300 times the size of the Siberian one, and you can begin to appreciate the impact of the ancient meteor that struck what is now the mouth of the Chesapeake Bay. (1994) Convulsive events in Atlantic coastal plain evolution - effects of the Chesapeake Bay bolide impact (abstract). Science, Volume 271, Issue 5253, pp. The information you enter will appear in your e-mail message and is not retained by Phys.org in any form. The 90-kilometer-diameter Chesapeake Bay structure lies beneath 400-500 meters of coastal sediments in northeastern Virginia. Chesapeake Bay, at ca. : Horton and Izett, 2005; Pusz et al., 2009). The crater's initial width, two seconds after impact, was 17 miles, but it soon widened to 25 miles (40 kilometers). Griscom D. L. (2002) Is Washington DC built on ejecta deposits of the upper-Eocene Chesapeake Bay Crater? 925-928, doi:10.1130/G21854.1, http://geology.gsapubs.org/content/33/12/925.abstract. The size of the crater is constrained in Plescia et al. Insight from numerical modeling. U.S. Geological Survey Professional Paper 1612, 82 p. The Chesapeake Bay crater is an 85 km impact structure formed during the late Eocene, about 35.4 million years ago. Horton, J. W., Jr., G. S. Gohn, J. C. Jackson, J. N. Aleinikoff, W. E. Sanford, L. E. Edwards, and D. S. Powars. In Large Meteorite Impacts III: Geological Society of America Special Paper 384, 2005a, pp. A rare find is buried in Russia's Popigai crater: diamonds. A major project by the International Continental Scientific Drilling Program and U.S. Geological Survey explored the site between 2003 and 2006. 363-428, doi:10.5194/sed-4-363-2012. Transformations to granular zircon revealed: Meteor Crater, Arizona, The effects of solar flares on Earth's magnetosphere, Environmental scientists: Up to 20% of global groundwater wells at risk of going dry, Using a new kind of electron microscopy to measure weak van der Waals interactions, A new method to generate and control orbital angular momentum beams, Study: Fish farming reduces genetic diversity of salmon in Swedish rivers. Their research was recently published in the international journal Meteoritics & Planetary Science. 697-700.. 85-90 km diameter (Poag et al. pp. GORE TENARA HTR Style in Chesapeake Bay Blue provides a color-rich seam to any outdoor fabric. Date Time Feet Tide; Fri Apr 23: 1:11am: 1.18 ft: High Tide: Fri Apr 23: 7:24am: 0.32 ft 10. (2009) Pre-impact tectonothermal evolution of the crystalline basement-derived rocks in the ICDP-USGS Eyreville B core, Chesapeake Bay impact structure. The first hint was a 8-inch-thick (20 cm) layer of ejecta found in a drilling core taken off Atlantic City, New Jersey, about 170 miles to the north. Virginia, and the District of Columbia ...disguised as ?5000 km2 of “upland deposits”, Geological Society of America Wetumpka Field Forum 2007 Guidebook and Abstracts, 85. 1740–1745, doi:10.1126/science.1158708. 469-479. doi:10.1130/2009.2458(21), Plescia J. Geological Society of America, Abstracts with Programs, Volume 25, p. A-378. 819-833. doi: 10.1111/j.1945-5100.2006.tb00488.x, http://onlinelibrary.wiley.com/doi/10.1111/j.1945-5100.2006.tb00488.x/abstract, McFarland, E. R., and T. S. Bruce. The impact, more powerful than the combined explosion of every nuclear bomb on Earth, blasted out … Popigai crater. NY: Not only is the Chesapeake Bay so enormous it can be seen from space, it essentially came from outer space. Location. Powars D. S., Bruce T. S., Poag C. W., Mixon R. B. Horton, J.W., Jr., and Izett, G.A., 2005; Horton et al., 2009; Bartosova et al., 2009; Vanko, 2009. (2004) The Chesapeake Bay Crater: Geology and Geophysics of a Late Eocene Submarine Impact Structure, Springer-Verlag, Berlin, 2004. Click here to sign in with : Horton and Izett, 2005; Pusz et al., 2009). The content is provided for information purposes only. 200 m water depth.  ISBN-10: 3540404414; ISBN-13: 978-3540404415; doi: 10.1017/S0016756805260430. The Chesapeake Bay impact structure is associated with the North American tektite strewn field. It now ranks as the largest known impact crater in the U.S., and the 15th largest on Earth. Despite the fact that the structure is deeply buried, it is one of the better studied impact craters in the United States, through drilling and geophysical survey. Size of Meteorite: 30 m in diameter and 90,700 tons (U.S. Geologic Survey, n.d.) Size of Crater: 1.2 km in diameter and 180 m deep (U.S. Geologic Survey, n.d.) Location: Northern Arizona, Desert ecosystem, thin soil, exposed bedrock, low relief (Roddy et al., 1975) A Comparison of … This historical marker is listed in this topic list: Natural Features. 7–26, doi:10.1016/S0022-3093(03)00304-1. http://www.sciencedirect.com/science/article/pii/S0022309303003041, Horton, J. W., Jr., J. N. Aleinikoff, M. J. Kunk, G. S. Gohn, L. E. Edwards, J. M. Self-Trail, D. S. Powars, and G. S. Izett. 35 million years ago, a blazing fireball from space burst through the earth’s atmosphere and slammed into the prehistoric Mid-Atlantic. Deep -draft vessels use the Atlantic entrance, which is about 10 miles wide between Fishermans Island on Horton Jr. J. W., Aleinikoff J. N., Kunk M. J., Naeser C. W., Naeser N. D. (2005) Petrography, structure, age, and thermal history of granitic Coastal Plain basement in the: Chesapeake Bay Impact Structure, USGS-NASA Langley core, Hampton, Virginia, in Studies of the Chesapeake Bay Impact Structure – The USGS-NASA Langley Corehole, Hampton, Virginia, and related coreholes and geological surveys, edited by: Horton Jr, J. W., Powars, D. S., and Gohn, G. S., B1–B29, U.S. Geological Survey Professional Paper 1688. 507—510., http://geology.gsapubs.org/content/26/6/507.abstract, Johnson G. H., Powars D. S. (1996) Effects of Chesapeake Bay impact structure on late Cenozoic stratigraphic sequences and landscapes, southeastern Virginia (abstract) Geological Society of America Abstracts with Programs, Volume 28, No. Significance? With a newly formed basin, surrounding rivers diverted their courses and created a single channel that dug an impressive river valley over the subsequent millennia. "ICDP-USGS Workshop on Deep Drilling in the Central Crater of the Chesapeake Bay Impact Structure, Virginia, USA: Proceedings volume." In Studies of the Chesapeake Bay Impact Structure - The USGS-NASA Langley Corehole, Hampton, Virginia, and Related Coreholes and Geophysical Surveys: U.S. Geological Survey Professional Paper 1688. Oxygen Extracted from Martian Atmosphere - a first! GSA Special Paper 458. http://geology.gsapubs.org/content/33/5/417.short, Shah A. K., Daniels D. L., Kontny A., and Brozena J. A team of researchers, including Arizona State University School of Earth and Space Exploration scientist and lead author Marc Biren, along with co-authors Jo-Anne Wartho, Matthijs Van Soest and Kip Hodges, has obtained drilling samples from the Ocean Drilling Project site 1073 and dated them with the "uranium-thorium-helium technique" for the first time. 235–255. The target region was on the marine continental shelf at the time of impact, and most of the region is still or again underwater today. It is one of the largest known impact craters on Earth. Scientists refer to this layer as the "North American tektite strewn field," which covers a region of roughly 4 million square miles, about 10 times the size of Texas. 2004), is among the Earth’s largest and, at 35 Ma age, one of the best preserved impact structures known on Earth. (2005) New surveys of the Chesapeake Bay impact structure suggest melt pockets and target structure effect. The result was an inland bulge around the lower Chesapeake Bay, centered around Cape Charles on the Eastern Shore. the bolide central crater and "annular ring" outside. (1993) The Chesapeake Bay “impact crater”; Stratigraphic and seismic evidence (abstract). (2009) Rock magnetic properties of the ICDP-USGS Eyreville core, Chesapeake Bay impact structure, USA. Scientists say sea level rise is occurring at a faster pace in the Chesapeake Bay region than the global average, and the dramatic formation of the bay itself is a significant reason why. Shah A. K., Brozena J., Vogt P., Daniles D., Plescia J. Visit to The National Gem and Crystal Expo, Windsor, NSW, Australia. Powars D. S., Johnson G. H., Bruce T. S. (1998) Stratigraphic, structural, and hydrogeological complexities related to the outer rim of the Chesapeake Bay impact crater (abstract). or, by Arizona State University. Twenty-one miles per second. (2009) Megablocks and melt pockets in the Chesapeake Bay impact structure constrained by magnetic field measurements and properties of the Eyreville and Cape Charles cores. All rights reserved. pp. Mars had a Great Oxygenation Event, just like Earth did. Apart from any fair dealing for the purpose of private study or research, no Chesapeake Bay , the largest inland body of water along the Atlantic coast of the United States, is 168 miles long with a greatest width of 23 miles. Considered to be one of the best-preserved “wet-target” impact craters in the world, the Chesapeake Bay Crater is the largest known impact site in the United States. Chesapeake Bay Crater Boundaries of the crater. 689-703. doi: 10.1111/j.1945-5100.2006.tb00985.x, http://onlinelibrary.wiley.com/doi/10.1111/j.1945-5100.2006.tb00985.x/abstract. Try pasting the link shown into a search engine or searching for the article authors, title, or other reference information. pp. http://www.sciencemag.org/content/320/5884/1740, Gohn S. G., Koeberl C., Miller K. G., Reimold W. U. In The ICDP-USGS Deep Drilling Project in the Chesapeake Bay Impact Structure: Results from the Eyreville core holes, edited by Gohn G. S., Koeberl C., Miller K. G., and Reimold W. U. GSA Special Paper 458. It is one of the largest known impact craters on Earth. Thank you for taking your time to send in your valued opinion to Science X editors. (2003) Fossil natural glasses composed of ferric oxyhydroxides: Impactites of the 35.5 million year old Chesapeake Bay crater. Waves 1 ft. A., Powars D. S., Sanford W. E., Voytek M. A. 2 Norfolk, VA P ublished by the . U.S. Geological Survey Professional Paper 1688-A-K, 2005b, p. 453., Johnson G. H., Kruse S. E., Vaughn A. W., Lucey J. K., Hobbs C. H. III, Powars D. S. (1998) Postimpact deformation associated with the late Eocene Chesapeake Bay impact structure in southeastern Virginia: Geology, Volume 26, No. For this study, Biren worked with co-authors Wartho (now working at GEOMAR Helmholtz Centre for Ocean Research Kiel), Van Soest and Hodges to prepare samples for analysis and to date zircon crystals with the uranium-thorium-helium dating method. Asteroid impact date: Estimated 580 million years ago. PALAIOS, Volume 18, No. Science X Daily and the Weekly Email Newsletter are free features that allow you to receive your favorite sci-tech news updates in your email inbox. (2008) Deep drilling into the Chesapeake Bay impact structure, Science, Volume 320, Issue 5884, pp. Boulder, Colorado: Geological Society of America. Timing of the impact is relatively well constrained by multiple studies, to 35.3 to 35.4 Ma (e.g. Your email address is used only to let the recipient know who sent the email. Neither your address nor the recipient's address will be used for any other purpose. In The ICDP-USGS Deep Drilling Project in the Chesapeake Bay Impact Structure: Results from the Eyreville core holes, edited by Gohn G. S., Koeberl C., Miller K. G., and Reimold W. U. GSA Special Paper 458. Young, flat-lying sedimentary rocks create the Coastal Plain. pp. Geology, Volume.33, Dec., pp. Geological Society of America Abstracts with Programs, Volume 26, p. 410.. “Another meteor of similar size to that would be the next likely event.”. "Key to our investigation were zircon—or to be more precise: zirconium silicate—crystals that we found in the oceanic sediments of a borehole, which is located almost 400 kilometers (250 miles) northeast of the impact site, in the Atlantic Ocean," says co-author Wartho, who began the study when she was a lab manager at the Mass Spectrometry Lab at ASU. "Determining accurate and precise ages of impact events is vital in our understanding of the Earth's history," Biren said. (2006) Confirmation of a meteoritic component in impact-melt rocks of the Chesapeake Bay impact structure, Virginia, USA - Evidence from osmium isotopic and PGE systematics, Meteoritics and Planetary Science, Volume 41, issue 6, pp. Specs: Located in what is… These 1-pound spools enable longer runs without having to change spools. 11, pp. Boulder, Colorado: Geological Society of America. 218-226. doi: 10.1111/j.1945-5100.1996.tb02015.x, http://onlinelibrary.wiley.com/doi/10.1111/j.1945-5100.1996.tb02015.x/abstract, Poag C. W. (2002) Synimpact-postimpact transition inside Chesapeake Bay crater. (abstract). About 35 million years ago a 3-5 kilometres in diameter impactor hit the western Atlantic Ocean on a shallow shelf, creating the Chesapeake Bay impact crater. About 35 million years ago, an asteroid hit the ocean off the East Coast of North America. Location: South Australia, Australia. Topics. The team studied zircon crystals in particular because they preserve evidence of shock metamorphism, which is caused by shock pressures and high temperatures associated with impact events. 7, p. A119., Johnson G. H., Powars D. S., Bruce T. S., Vaughn A. W, Lucey J. K., Kruse S. E. (1998) Relationship of Yorktown Formation lithofacies to post-impact deformation on the terrace zone, southeastern Virginia (abstract).
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