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The Chesapeake Bay Bolide Impact: a New View of Coastal Plain Evolution

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The Chesapeake Bay Bolide Impact: a New View of Coastal Plain Evolution science for a changing world The Chesapeake Bay Bolide Impact: A New View of Coastal Plain Evolution Bolide Impact West East A spectacular geological event took place on the Atlantic margin of North America about 35 million years ago in the late part of the Eocene Epoch. Sea level was unusually high everywhere on Earth, and the ancient shoreline of the Virginia region was somewhere in the vicinity of where Richmond is today (fig. 1). Tropical rain forests covered the slopes of the Appalachians. To the east of a narrow coastal plain, a broad, lime (calcium car- bonate)-covered continental shelf lay beneath the ocean. Suddenly, with an intense flash of light, that tranquil scene Figure 2. Cross section showing main features of Chesapeake Bay impact crater and three core- was transformed into a hellish cauldron of holes that provided data on these features. mass destruction. From the far reaches of Geological Survey, USGS), who has impact breccia, fills the crater and forms a space, a bolide (comet or asteroid), 3-5 assembled an international team to investi­ thin halo around it, called an ejecta blanket. kilometers in diameter, swooped through gate its characteristics and consequences. the Earth's atmosphere and blasted an enor­ Evidence of the crater comes from two Effects of the Bolide Impact mous crater into the continental shelf. The sources: (I) cores drilled by the USGS and crater is now approximately 200 km south­ Discovery of the giant crater has com­ the Virginia State Water Control Board (fig. east of Washington, D.C.. and is buried pletely revised our understanding of 2), and (2) marine seismic-reflection pro­ 300-500 meters beneath the southern part Atlantic Coastal Plain evolution. In particu­ files collected by Texaco, Inc., the USGS, of Chesapeake Bay and the peninsulas of lar, studies by Poag's project revealed sev­ and the National Geographic Society. southeastern Virginia (fig. 1). eral consequences of the ancient cataclysm The cores sampled a sandy rubble bed, The entire bolide event, from initial that still affect citizens around the bay which contains hand-size to person-size impact to the termination of breccia deposi­ today: land subsidence, river diversion, dis­ chunks (clasts) of clay, limestone, and tion, lasted only a few hours or days. The ruption of coastal aquifers, ground instabil­ sand. The clasts change rapidly downcore crater was then buried by additional sedi­ ity, and location of Chesapeake Bay. These in composition, size, color, orientation, and mentary beds, which accumulated during are discussed below. age. The clasts are fragments ripped from the following 35 million years. previously deposited beds that underlie Land Subsidence Bolide Crater southeastern Virginia. Small pieces of the deeply buried granitic basement rocks also Evidence of accelerated land subsi­ The Chesapeake Bay crater was are scattered throughout the rubble and dence is reflected in the geology and recently identified by C. Wylie Poag (U.S. contain shocked quartz and melted grains, topography of the modern land surfaces which confirm an impact. around the crater. The breccia is 1.3 km The structure and geometry of the thick and was deposited as a water-saturat­ crater were determined by seismic profiling ed, sandy, rubble-bearing slurry (like con­ from ships in the bay. Seismic profiles are crete before it hardens). The sediment lay­ like two-dimensional cross sections of the ers surrounding the crater, on the other subsurface beds. Analysis of 1,200 km of hand, were already partly consolidated, and profiles shows that the crater is 85 km in so the mushy breccia compacted much diameter and 1.3 km deep; an excavation more rapidly under its subsequent sediment twice the size of Rhode Island and as deep load than the surrounding strata. The com­ as the Grand Canyon. It is three times larg­ paction differences produced a subsidence er than any other U.S. crater and is the differential, causing the land surface over Figure 1. Location of bolide impact and of sixth largest crater known on the planet. the breccia to remain lower than the land shoreline when bolide hit. The rubble bed, which we now realize is an surface over sediments outside the crater. U.S. Department of the Interior USGS Fact Sheet FS 049-98 U.S. Geological Survey May 1998 Poag's team observed that the bound­ that we need to be especially conservative all the way to the shelf edge. About 10,000 ary between older surface rocks and of ground-water use in that area. years ago, however, the ice sheets began to younger surface rocks coincides with the melt rapidly, causing sea level to rise and position and orientation of the crater rim on Ground Instability Due To Faulting flood the shelf and the coastal river valleys. all three peninsulas that cross the rim. The The flooded valleys became the major Seismic profiles across the crater show older beds have sagged over the subsiding modern estuaries, like Delaware Bay and many faults that cut the sedimentary beds breccia, and the younger rocks have been Chesapeake Bay. The rivers of the Chesa­ above the breccia and extend upward deposited in the resulting topographic peake region converged at a location direct­ toward the bay floor (fig. 3). The resolution depression. The topography also reflects ly over the buried crater. In short, the of our seismic profiles allows us to trace the differential subsidence. The Suffolk impact crater created a long-lasting topo­ the faults to within 10 m of the bay floor. Scarp and the Ames Ridge are elevated graphic depression, which helped deter­ These faults are another result of the subsi­ landforms (10-15 m high) located at, and mine the eventual location of Chesapeake dence of the breccia. These faults are zones oriented parallel to, the crater rim. Bay. of crustal weakness and have the potential Crater-related ground subsidence also for continued slow movement, or sudden may play a role in the high rate of relative Metric Units Explained larger offsets if reactivated by earthquakes. sea-level rise documented for the Chesa­ Some of the faults appear to complete­ 1 kilometer (km) = 0.621 mile peake Bay region. One of the locations of ly breach the confining unit over the salt­ 1 meter (m) = 3.28 feet highest relative sea-level rise is at Hampton water reservoir. They could allow the salty 4,000 cubic kilometers = 960 cubic miles Roads (the lower part of the James River), water to flow upward and contaminate the located over the crater rim. freshwater supply. Poag is mapping the River Diversion location, orientation, and amount of offset For more information, please contact: of these compaction faults. C. Wylie Poag Even the courses of the modern rivers U.S. Geological Survey in the lower bay region point to the contin­ Location of Chesapeake Bay Woods Hole Field Center ued influence of differential subsidence 384 Woods Hole Road Did the Chesapeake Bay bolide affect over the crater. Most of the rivers, like the Woods Hole, MA 02543-1598 the location of Chesapeake Bay itself? We Rappahannock, flow southeastward to the Telephone: (508) 457-2258 know that the bay is nowhere near 35 mil­ Atlantic. In contrast, the York and James Fax:(508)457-2310 lion years old. In fact, as late as 18,000 Rivers make sharp turns to the northeast E-mail: [email protected] years ago, the bay region was dry land: the near the outer rim of the crater. Bolide Web Site: last great ice sheet was at its maximum http://woodshole.er.usgs.gov/epubs/bolide Disrupted Coastal Aquifers over North America, and sea level was about 200 m lower than at present. This sea Another consequence of the bolide is level exposed the area that now is the bay that all ground-water aquifers were truncat­ bottom and continental shelf. With sea ed and excavated by the impact. In place of level this low, the major east coast rivers those aquifers, there is now a single huge had to cut narrow valleys across the region reservoir with a volume of 4,000 cubic kilometers. That's enough breccia to cover all of Virginia and Maryland with a layer 30 m thick. In this huge new reservoir, pore spaces are filled with briny water that is 1.5 times saltier than normal seawater. This water is too salty to drink or to use in industry. Geohydrologists have known of this salty water for decades, but only now are we beginning to grasp the true nature of its origin and distribution. The presence of this hypersaline aquifer has some practical implications for ground-water management in the lower bay region. For example, we need to know how deeply buried the breccia is in order to avoid drilling into it inadvertently and con­ taminating the overlying freshwater aquifers. km Its presence also limits the availability of O Drillhole Corehole freshwater. On the Delmarva Peninsula, over the deepest part of the crater, only the Figure 3. Location of faults (red lines) where they cross seismic profiles. The large circle shows the extent of the buried crater. The brick pattern shows the three main cities of the lower Chesa­ aquifers above the breccia are available for peake Bay. Red capital letters mark the locations of the Newport News, Windmill Point, Exmore, freshwater. The crater investigation shows and Kiptopeke coreholes..
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