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Chesapeake bay crater

Le cratère de la baie de Chesapeake est un cratère d'impact formé par une météorite qui a heurté la côte est du continent nord-américain il y a environ 35 millions d'années, durant le Priabonien (Éocène supérieur) Powars, D.S., 2000, The effects of the Chesapeake Bay impact crater on the geologic framework and the correlation of hydrogeologic units of Southeastern Virginia, south of the James River: U.S. Geological Survey Professional Paper 1622, 53 p. Prepared in cooperation with the Hampton Roads Planning District Commission Professional Paper 168 The Chesapeake Bay crater is an 85 km impact structure formed during the late Eocene, about 35.4 million years ago. 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 Cross section showing main features of Chesapeake Bay impact crater and three coreholes that provided data on these features. The cores sampled a sandy rubble bed, which contains hand-size to person-size chunks (clasts) of clay, limestone, and sand. The clasts change rapidly downcore in composition, size, color, orientation, and age

Cratère de la baie de Chesapeake — Wikipédi

Wylie Poag, U.S. Geological Survey (USGS), identified the Chesapeake Bay Crater, which was formed when an object hit the Atlantic Ocean over 35 million years ago in the late Eocene and is largely responsible for creating the Chesapeake Bay and surrounding area Der Chesapeake-Bay-Krater ist eine etwa 35,5 Millionen Jahre alte Impaktstruktur an der Ostküste der USA, welche erst Anfang der 1990er Jahre entdeckt wurde. Das Zentrum des Kraters liegt nahe der Südspitze der Delmarva-Halbinsel welche die Chesapeake Bay vom Atlantischen Ozean abgrenzt The Chesapeake Bay impact crater was formed by a bolide that impacted the eastern shore of North America about 35 million years ago, in the late Eocene epo.. This computer simulation illustrates how an asteroid contributed to the formation of the Chesapeake Bay impact crater. Light brown symbolizes sediment and wa..

The Chesapeke Bay Impact Crater - USG

  1. The Chesapeake Bay Program is formed between Maryland, Virginia, Pennsylvania, Washington, D.C., the EPA and the Chesapeake Bay Commission to attack these problems. 1984 - Maryland passes the Chesapeake Bay Critical Areas Protection Act to control development along the bay's shoreline and tidal rivers
  2. The Chesapeake Bay impact crater is the largest in the United States, but geologists discovered it only in 1983. It was created 35 million years ago when a comet or asteroid about 0.6 miles (1 km.
  3. e that a bay would eventually be located there. Ancient Susquehanna River Valley . During the last Ice Age, mile-thick glaciers stretched as far south as Pennsylvania, and the.
  4. The Chesapeake Bay impact crater is one of only a few oceanic impact craters that have been documented worldwide. About 35 million years ago a huge rock or chunk of ice traveling through space.
  5. ed by documenting the stratigraphic ranges of three groups of microfossils (planktonic fora
  6. Wittman, A., et al., Petrology of impact melt rocks from the Chesapeake Bay crater, USA, Special Paper of the Geological Society of America, Issue 458, pp. 377-396, 2009: Wittman, A., et al., The record of ground zero in the Chesapeake Bay impact crater-Suevites and related rocks, Special Paper of the Geological Society of America, Issue 458, pp. 349-376, 2009 : Wright Horton Jr., J., et al.

United States Meteorite Impact Craters - Chesapeake Bay

The Chesapeake Bay Crater. Despite its title, Chesapeake Invader is not a book about non-native species invading Chesapeake Bay, but rather a tale of how the giant meteorite crater on the bottom of Chesapeake Bay was discovered. The title is indeed finished off with Discovering America's Giant Meteorite Crater, but that's not on the spine, so the average space science enthusiast could quite. The Chesapeake Bay Crater: Geology and Geophysics of a Late Eocene Submarine Impact Structure ; with 42 Tables ; ESF IMPACT. Wylie Poag, Christian Koeberl, Wolf Uwe Reimold, W. U. Reimold. Springer Science & Business Media, 2004 - Science - 522 pages. 0 Reviews . . . bangs have replaced whimpers and the geological record has become much more exciting than it was thought to be. Derek Ager.

The Chesapeake Bay impact was a dramatic event, but the Chicxulub crater was formed by an impactor perhaps 2-3 times larger. The Chicxulub crater is over 100 miles 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 The Chesapeake Bay impact crater was formed by a bolide that impacted the eastern shore of North America about 35.5 ± 0.3 million years ago, in the late Eocene epoch. It is one of the best-preserved wet-target or marine impact craters, and the largest known impact crater in the U.S.. Continued slumping of sediments over the rubble of the crater has helped shape the Chesapeake Bay

This volume synthesizes 16 years of geological and geophysical studies that document an 85-km-wide impact crater buried 500 m beneath Chesapeake Bay in southeastern Virginia, USA. The authors integrate extensive seismic reflection profiling and deep core drilling to analyze the structure, morphology, gravimetrics, sedimentology, petrology, geochemistry, and paleontology of this submarine. The Chesapeake Bay crater has all the characteristics of a peak-ring crater, like King crater. Location of Chesapeake Bay. Did the Chesapeake Bay bolide affect the location of Chesapeake Bay itself? The answer is a complicated one. We know that the bay is nowhere near 35 million years old, which is when the bolide struck. In fact, as late as 18,000 years ago, the bay region was dry land; the. cratère d'impact Chesapeake Bay - Chesapeake Bay impact crater. Un article de Wikipédia, l'encyclopédie libre. cratère d'impact Chesapeake Bay; Emplacement du site d'impact par rapport aux États-Unis. Cratère d'impact / structure ; Confiance: Confirmé: Diamètre: 53 miles (85 km) Profondeur: 0,81 miles (1,3 km) diamètre Impactor: 1,9 miles (3 km) Âge: 35,5 ± 0,3 million: Exposé: Non. The Chesapeake Bay impact crater was formed by a bolide that impacted the eastern shore of North America about 35.5 ± 0.3 million years ago, in the late Eocene epoch. It is one of the best-preserved wet-target impact craters in the world. Chesapeake Bay impact crater; Location of impact site in relation to the United States . Impact crater/structure; Confidence: Confirmed: Diameter: 53.

Drilling into the Chesapeake Bay crater has ended for now, but Sanford suspects that more water of this age and composition is sequestered elsewhere deep off the Atlantic Coast, waiting to be found The Chesapeake Bay Crater Geology and Geophysics of a Late Eocene Submarine Impact Structure. Authors: Poag, Wylie, Koeberl, Christian, Reimold, Wolf Uwe Free Preview. Buy this book eBook 181,89 € price for Spain (gross) Buy eBook ISBN 978-3-642-18900-5; Digitally watermarked, DRM-free. Boats sail above the Chesapeake Bay crater and crabs tiptoe across it and developers build on top of it. In a million little ways, the crater touches them. In riddles that surprise or stump them, annoy or just perplex them, the crater makes its presence known. Something that big, that old, that cataclysmic will not lie dormant and forgotten. The crater shapes the future of Hampton Roads. For.

Chesapeake Bay Impact Crater Historical Marker

Buy The Chesapeake Bay Crater: Geology and Geophysics of a Late Eocene Submarine Impact Structure by Poag, Wylie, Koeberl, Christian, Reimold, Wolf Uwe online on Amazon.ae at best prices. Fast and free shipping free returns cash on delivery available on eligible purchase The resultant crater is now buried 400-500 m beneath lower Chesapeake Bay, its surrounding peninsulas, and the continental shelf east of Delmarva Peninsula. This convulsive event, and the giant tsunami it engendered, fundamentally changed the regional geological framework and depositional regime of the Virginia Coastal Plain, and produced the following principal consequences. (1) The impact. Our Chesapeake Bay Impact Crater kept its identity a secret for a good bit of its 35 million year existence. Some material was vaporized when the bolide struck; some was thrown into the air and fell back in a jumble; some was melted and flung into the air, falling as glassy blobs called tektites as far away as Georgia and Texas. Over the eons, marine sediments filled in part of the crater and. Get this from a library! The Chesapeake Bay Crater : Geology and Geophysics of a Late Eocene Submarine Impact Structure. [C Wylie Poag; Christian Koeberl; Wolf Uwe Reimold] -- This volume synthesizes 16 years of geological and geophysical studies that document an 85-km-wide impact crater buried 500 m beneath Chesapeake Bay in southeastern Virginia, USA

The authors have synthesized 16 years of geological and geophysical studies which document an 85-km-wide impact crater buried 500 m beneath Chesapeake Bay in south eastern Virginia, USA. In doing so, they have integrated extensive seismic reflection profiling and deep core drilling to analyze the structure, morphology, gravimetrics, sedimentology, petrology, geochemistry, and paleontology of. The Chesapeake Bay impact crater was formed by a bolide that impacted the eastern shore of North America about 35.5 ± 0.3 million years ago, in the late Eocene epoch. It is one of the best-preserved wet-target or marine impact craters, and the largest known impact crater in the U.S The Chesapeake Bay offers a wide range of recreational activities such as fishing, crabbing, swimming, boating, kayaking, and sailing. Some of the region's most popular getaway destinations are along the Bay. Major Tributaries (Rivers) There are thousands of tributaries that send fresh water into the Chesapeake Bay and offer a vital habitat to aquatic animals and plants. These creeks, streams. Chesapeake Bay Impact Crater: A Cosmic Connection in Virginia. David Powars: Quick summary of the talk.The three main points that I'm going to hit are when/where the Chesapeake impact crater, so that everybody can leave here being able to tell a seven-year-old what an impact crater is and what the Chesapeake Bay impact crater is

The Chesapeake Bay Bolide Impact: A New View of Coastal

The Chesapeake Bay Crater also available in docx and mobi. Read The Chesapeake Bay Crater online, read in mobile or Kindle. The Chesapeake Bay Crater. Geology and Geophysics of a Late Eocene Submarine Impact Structure. Author: Wylie Poag. Publisher: Springer Science & Business Media. ISBN: Category: Science. Page: 523. View: 865. Download Now. The authors have synthesized 16 years of. The Effects of the Chesapeake Bay Impact Crater on the Geologic Framework and the Correlation of Hydrogeologic Units of Southeastern Virginia, South of the James River By D.S. Powars Abstract About 35 million years ago, a large comet or meteor slammed into the shallow shelf on the western margin of the Atlantic Ocean, creating the Chesapeake Bay impact crater (CBIC). Virginia Coastal Plain.

CHESAPEAKE IMPACT CRATER - Crater Explore

the Chesapeake Bay Impact Structure was approximately 1.2 x 109 metric tons in mass (Edwards, 2009). The Barringer Crater is located in northwestern Arizona, in a rocky environment while the meteorite that created the Chesapeake Bay Impact Structure impacted shallow water over a large area. Barringer Crater 35.0275° N, 111.0221° W Chesapeake Bay A crater from a long-ago comet impact in the Chesapeake Bay lies under many feet of sediments. Credit and Larger Version; View Additional Multimedia; August 12, 2008. Few summer boaters on the Chesapeake Bay know that a several-miles-wide maw lies directly beneath them. Called the Chesapeake Bay Impact Structure, this 35-million-year-old crater is hidden beneath the waters of the Chesapeake.

Chesapeake Bay - Wikipedi

  1. Located beneath the mouth of the Chesapeake Bay running from underneath the tip of the Delmarva Peninsula (near present-day Cape Charles, Virginia), across the Bay to Norfolk, Virginia, the roughly circular crater is twice the size of Rhode Island (2,500 sq mi [6,400 sq km]) and nearly as deep as the Grand Canyon (0.8 mi [1.3 km] deep). The depression created by the crater caused river valleys.
  2. When the object hit the Earth, near the mouth of what is now the Chesapeake Bay, it rustled up water already in the sediment, according to National Geographic, trapping it underground in an area.
  3. La baie de Chesapeake est le plus grand estuaire des États-Unis qui s'étend entre les États de la Virginie et du Maryland.La baie se trouve sur la côte Est et donne dans l'océan Atlantique.Elle fut le théâtre, le 5 septembre 1781, d'une bataille navale décisive lors de la guerre d'indépendance des États-Uni
  4. Chesapeake Bay, largest inlet in the Atlantic Coastal Plain of the eastern United States.Created by the submergence of the lower courses of the Susquehanna River and its tributaries, it is 193 miles (311 km) long and 3 to 25 miles (5 to 40 km) wide. The southern part of the bay is bordered by Virginia and its northern part by Maryland.Its entrance from the Atlantic is flanked by Cape Charles.
  5. The Chesapeake Bay Crater: Geology and geophysics of a Late Eocene submarine impact structure: DOI: 10.1007/978-3-642-18900-5: Year Published: 2004: Language: English: Publisher: Springer: Contributing office(s) Coastal and Marine Geology Program: Description: 522 p. Country: United States: State: Maryland; Virginia : Google Analytic Metrics: Metrics page: Additional metadata about this.

Chesapeake Bay impact crater adds to sea level rise 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 Chesapeake Bay impact crater was formed by a bolide that impacted the eastern shore of North America about.. Ce cratère d'impact (formé par la chute d'une météorite) de 50 km de diamètre est situé dans la région de Meridiani Planum sur Mars. Sub-commander T'Pol has discovered the remnants of an impact crater that could explain the radiation. T'Pol a détecté un cratère d'impact. Use this short slide show to engage students with the Chesapeake Bay. Begin with a map of the Bay and close up images of the rivers from six states and the District of Columbia that feed into the Bay. Share that the Bay is the largest estuary in the United States and that no other American estuary has a higher yield of fish and seafood (including blue crab, oysters, clams, and striped bass)

Environment - Chesapeake Bay Crater Planning District

The Chesapeake Bay (/ ˈ tʃ ɛ s ə p iː k / CHESS-ə-peek) is the largest estuary in the United States. The Bay is located in the Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula (including the parts: the Eastern Shore of Maryland / Eastern Shore of Virginia and the state of Delaware) with its mouth of the Bay at the south end located between. The depression created by the crater changed the course of rivers and determined the location of the Chesapeake Bay. The Bay, as we know it today, was created about 10,000 years ago when melting glaciers flooded the Susquehanna River Valley. Today, fresh water from land drainage measurably dilutes seawater within the Bay

The Chesapeake Bay Impact Crater was discovered in 1999 by a tandem of USGS and Virginia Department of Environmental Quality scientists.. They theorized that a huge rock or chunk of ice slammed. Chemical, isotopic and physical evidence indicate that some of the groundwater in the Chesapeake Bay crater is remnant Early Cretaceous North Atlantic sea water, probably 100-145 million years. The Chesapeake Bay impact crater is defined on the basis of (1) seismic-reflection profiles that cross lower Chesapeake Bay and the continental shelf east of the Delmarva Peninsula; (2) Bouguer and free-air gravity measurements from the bay, the surrounding peninsulas, and the continental shelf; (3) two continuous core holes drilled inside the crater, and two drilled outside the crater [1]

Impact Craters in America - Topozone

About the Chesapeake Bay Impact Crater Chesapeake Bay Crater Offers Clues to Ancient Cataclysm National Geographic News The Chesapeake Bay Bolide Impact: A New View of Coastal Plain Evolution U.S. Geological Survey (USGS) Finding Impact Craters with Landsat-Lesson Plan-Step 1. Use students' interest in the highly dramatic, explosive to introduce the activity. Show students an aerial. The Chesapeake Bay impact crater was hidden beneath the muddy waters of the Chesapeake Bay and the Atlantic Ocean for about 35 million years. The submarine crater, discovered through oil drilling exploration, was, like Spider Crater, marked by rocks only found at impact craters. Mars' Happy Face crater was the result of a happy accident—a meteor impact. Photograph by NASA/JPL/MSSS Makhteshim.

Effects of Ancient Meteor Impacts Still Visible on Earth

Chesapeake Bay cráter de impacto - Chesapeake Bay impact crater. De Wikipedia, la enciclopedia libre. Chesapeake Bay cráter de impacto; Localización del punto de impacto en relación con los Estados Unidos. cráter de impacto / estructura ; Confianza: Confirmado: Diámetro: 53 millas (85 km) Profundidad: 0.81 millas (1,3 km) diámetro impactador: 1,9 millas (3 km) Años: 35,5 ± 0,3. Chesapeake Bay impact crater Impact crater. Desc: The Chesapeake Bay impact crater was formed by a bolide that impacted the eastern shore of North America about 35.5 ± 0.3 million years ago, in the late Eocene epoch. It is one of the best-preserved wet-target impact craters in the world Chesapeake Bay Impact Crater November 14, 2013. Ancient Seawater Found Under The Chesapeake Bay. USGS scientists have determined that high-salinity groundwater found more than 1,000 meters (0.6 mi.) deep under the Chesapeake Bay is actually remnant water from the Early Cretaceous North Atlantic Sea and is probably 100-145 million years old. This is the oldest sizeable body of seawater to be. The presence of the Chesapeake Bay crater also helps to explain a long-standing question about ground-water quality in southeastern Virginia. It had puzzled geohydrologists, including Cede Cederstrom, for more than fifty years. Why did so many shallow water wells, especially on the western side of Chesapeake Bay, produce unusually salty water? The water in some wells is in fact brine, seawater. The Chesapeake Bay crater is distinguished further by its cluster of at least 23 adjacent secondary craters. The North American tektite strewn field, a widespread deposit of distal ejecta, is thought to be derived from the Chesapeake Bay impact, perhaps with a small contribution from the Toms Canyon impact. No ejecta field is known to be associated with the Montagnais impact. No immediate.

Baie de Chesapeake — Wikipédi

  1. Bordée par le Maryland et la Virginie, Chesapeake Bay est le plus grand estuaire d'Amérique. Etendu sur plus de 300 kilomètres, le site est marqué par le Cap Charles au nord et le Cap Henry au Sud. La baie est propice à la baignade, aux excursions en bateau et aux sports aquatiques
  2. (en) C.Wiley Poag, C. Koeberl et W. U. Reimold, The Chesapeake Bay Crater : Geology and geophysics of a late Eocene submarine impact structure, Berlin, Springer-Verlag, 2004 (lire en ligne) Références ↑ (en) Earth Impact Databse ↑ Christian Koeberl, Forage dans le plus grand cratère américain, Pour la Science, juillet 2009. ↑ La superficie résultante équivaut à celle de la région.
  3. About the Chesapeake Bay Program. The Chesapeake Bay Program is a unique regional partnership that has led and directed the restoration of the Chesapeake Bay since 1983. 410 Severn Avenue Suite 112 Annapolis, MD 21403 Tel: (800) YOUR-BAY (968-7229) Fax: (410) 267-577
  4. Chesapeake Bay Impact Crater (GC602XB) was created by FLtravelers on 7/23/2015. It's a Other size geocache, with difficulty of 2, terrain of 1. It's located in Virginia, United States. The world's sixth largest impact crater was created about 35 million years ago when a two to three mile wide asteroid or comet splashed into a shallow sea and.
  5. Buy The Chesapeake Bay Crater: Geology and Geophysics of a Late Eocene Submarine Impact Structure (Impact Studies) 2004 by Poag, C. Wylie, Koeberl, Christian, Reimold, Wolf U. (ISBN: 9783540404415) from Amazon's Book Store. Everyday low prices and free delivery on eligible orders
  6. 10. Chesapeake Bay Crater Boundaries of the crater. Asteroid impact date: Estimated 35 million years ago. Location: Virginia, United States. Specs: Discovered in the early 1980s, the Chesapeake Bay Crater is located approximately 125 miles (201 kilometers) from Washington, D.C. Some estimates suggest this crater is 53 miles (85 kilometers) wide

Video: America's Largest Asteroid Impact Left a Trail of

Chesapeake Bay Inside The Crater

Oct 27, 2018 - CHESAPEAKE BAY IMPACT CRATER was formed by a bolide that impacted the eastern shore of North America about 35.5 ± 0.3 million years ago, in the late Eocene epoch. It is one of the best-preserved wet-target or marine impact craters, and the largest known impact crater in the U.S.- Wikipedi This page was last edited on 25 November 2014, at 18:51. Files are available under licenses specified on their description page. All structured data from the file and property namespaces is available under the Creative Commons CC0 License; all unstructured text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply How do you say Chesapeake Bay Crater? Listen to the audio pronunciation of Chesapeake Bay Crater on pronouncekiwi. Sign in to disable ALL ads. Thank you for helping build the largest language community on the internet. pronouncekiwi - How To Pronounce. Chesapeake Bay impact crater : bolide 35 million breccia craters north america Add or Exclude: impact 26% Add Exclude crater 18% Add Exclude water 8% Add Exclude from 6% Add Exclude ground 5% Add Exclud CBIC - Chesapeake Bay impact crater. Looking for abbreviations of CBIC? It is Chesapeake Bay impact crater. Chesapeake Bay impact crater listed as CBIC Looking for abbreviations of CBIC? It is Chesapeake Bay impact crater

Near-Earth Objects Impact Our Lives NAS

NASA Langley at Hampton, Va., sits near the edge of a 51-mile-wide impact crater created when a meteor or comet slammed into the ocean near the present-day mouth of the Chesapeake Bay. The impact severely disrupted the rock units that today are important aquifers providing drinking water to the Hampton Roads area. Large areas within the crater are unsuitable for future water-supply development Chesapeake Bay impact structure: Morphology, crater fill, and relevance for impact structures on Mars J. Wright HORTON, JR.1*, Jens ORMÖ2, David S. POWARS1, and Gregory S. GOHN 1 1U.S. Geological Survey, 926A National Center, Reston, Virginia 20192, USA 2Centro de Astrobiología Instituto Nacional de Técnica Aeroespacial (CSIC/INTA) Ctra de Torrejón a Ajalvir, km 4 28850 Torrejón de Ardoz.

The Top 10 Largest Meteorite Craters in the World

Chesapeake-Bay-Krater - Wikipedi

Though the Chesapeake Bay in its current form is more recent, created only 10,000 to 18,000 years ago by rising sea level, the underlying geography is much older. The discovery of the crater was somewhat fortuitous; it was the search for dramatically increased drinking water supplies needed to support the World War II build-up at the Norfolk and Newport News shipyards that began to reveal this. Chesapeake Bay crater, satellite image. Satellite image of Chesapeake Bay, Virginia, USA. This is the location of the underwater Chesapeake Bay impact crater, which is thought to have been formed by a bolide that impacted the eastern shore of North America about 35 million years ago, during the late Eocene epoch. It is one of the best-preserved 'wet-target' or marine impact craters, and the. Chesapeake Bay Impact Structure In the fall and winter, 2005 the International Continental Scientific Drilling Program and the United States Geological Survey drilled a deep corehole into the center of the Chesapeake Bay impact crater (Gohn et al., 2006)

Chesapeake Bay impact crater - Video Learning - WizScience

Of special interest are a detailed comparison with other terrestrial and extraterrestrial craters, as well as a conceptual model and computer simulation of the impact. The extensive illustrations encompass more than 150 line drawings and core photographs Chesapeake Bay Impact Crater shares news about buried crater underneath Chesapeake Bay in Virginia. Carved out 35 million years ago, the crater now can only be accessed by intensive drilling. To find more on crater, Aaron Gronstal, a microbiology student at the Open University in the United Kingdom, visited a drilling project at the Chesapeake crater to discover what sort of microbes may now.

Simulation Of Ancient Chesapeake Bay Impact Crater - YouTub

Buy The Chesapeake Bay Crater (9783540404415): Geology and Geophysics of a Late Eocene Submarine Impact Structure: NHBS - Edited By: W Poag, C Koeberl and W U Reimold, Springer Natur The Effects of the Chesapeake Bay Impact Crater on the Geologic Framework and the Correlation of Hydrogeologic Units of Southeastern Virginia, South (U.S. Geological Survey Professional Paper, 1622) by David S. Powars, February 2000, U S Geological Survey edition, Paperback in Englis

Top 10 Largest Impact Structures on Earth - Listverse

Chesapeake Bay TMDL (Total Maximum Daily Load) In 1998, major portions of Chesapeake Bay and its tidal tributaries within Virginia were identified as not meeting water quality standards and listed as impaired. Areas of the Bay and tidal rivers within Maryland, Delaware and the District of Columbia are also on the federally approved list of impaired waters. The main pollutants causing these. Chesapeake Bay Chesapeake Bay crater Chesapeake Bay Impact Structure The Bay's geology, its present form, and its very location were created by a bolide impact event at the end of the Eocene (about 35.5 million years ago), forming the Chesapeake Bay impact crater and the Susquehanna River valley much later The discovery nearly two decades ago of a 90 km-diameter impact crater below the lower Chesapeake Bay has gone unnoted by the general public because to date all published literature on the subject has described it as buried. To the contrary, evidence is presented here that the so-called upland deposits that blanket ∼5000 km 2 of the U.S. Middle-Atlantic Coastal Plain (M-ACP) display. The Chesapeake Bay Impact Crater Marker. Inscription. . A meteor/comet two miles wide crossed paths with Earth 35 million years ago. Moving at the speed of 21 miles per second, it crashed here, and what is today the town of Cape Charles, creating the sixth largest impact crater on earth. The meteor blasted into the shallow sea that covered the state's eastern half, and exploded with more force.

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