Scientists: Timber in Lake Michigan centuries old

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In this photo made June 16, 2013, and provided by Great Lakes Exploation Group, diver Jim Nowka of Great Lakes Exploration Group inspects a wooden beam extending from the floor of Lake Michigan that experts believe may be part of the Griffin, a ship that sank in 1679. Crews are digging a pit at the base of the beam to see if it's attached to a buried ship. (AP Photo/David J. Ruck, Great Lakes Exploration Group)

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Scientists: Timb... In this photo made June 16, 2013, and provided by Great Lakes Exploation Group, diver Jim Nowka of Great Lakes Exploration Group inspects a wooden beam extending from the floor of Lake Michigan that experts believe may be part of the Griffin, a ship that sank in 1679. Crews are digging a pit at the base of the beam to see if it's attached to a buried ship. (AP Photo/David J. Ruck, Great Lakes Exploration Group)
Defense attorney... FBI Assistant special agent Eric Smith, right, answers questions during a news-conference Tuesday, June 18, 2013, in Cleveland. U.S. attorney Steven M. Dettelbach, left, listens. Authorities in Ohio have arrested three people on charges of enslaving a mentally disabled young mother and her daughter over a two-year period. Federal agents and Ashland police said Tuesday the trio forced the woman to do housework, threatened her and the girl with violence and fed their pets better than the victims. (AP Photo/Tony Dejak)
18 mayors: Limit... FILE - In this March 12, 2013 file photo, New York City Mayor Michael Bloomberg looks at a 64-ounce cup, as Lucky's Cafe owner Greg Anagnostopoulos, left, stands behind him, during a news conference at the cafe in New York. The mayors of New York, Los Angeles, Chicago and 15 other cities are reviving a push against letting government food vouchers be used to buy soda and other sugary drinks. In a letter to congressional leaders Tuesday, the mayors say it’s “time to test and evaluate approaches limiting” the use of the subsidies’ for sugar-laden beverages. (AP Photo/Seth Wenig, File)
Hoffa mystery st... Law enforcement officials from the Michigan State Police help search the area in Oakland Township, Mich., Tuesday, June 18, 2013 where officials continue the search for the remains of Teamsters union president Jimmy Hoffa who disappeared from a Detroit-area restaurant in 1975. (AP Photo/Carlos Osorio)
FBI digging at f... FBI agents replace dirt after searching in the backyard of a New York city house once occupied by a famous gangster, Tuesday, June 18, 2013, in New York. The work started Monday at the home of James Burke, a Lucchese crime family associate known as "Jimmy the Gent." He was the inspiration for Robert De Niro's character in the 1990 Martin Scorsese movie "Goodfellas." Burke died behind bars in 1996, two decades after authorities say he masterminded a nearly $6 million robbery at New York's Kennedy Airport, one of the largest cash thefts in American history. The Queens house is still owned by the Burke family, but others now live there. (AP Photo/Kathy Willens)
Radar shows torn... Storm clouds are seen over Denver International Airport on Tuesday, June 18, 2013, where a tornado touched down and forced passengers and employees into shelters. No one was injured and there was no apparent damage. (AP Photo/Ed Andrieski)
New video, $65K ... In this March 8, 2008 image taken from video and provided by the Federal Bureau of Investigation, a bomb explodes outside the United States Armed Forces Recruiting Station in New York City’s Times Square. On Tuesday, June 18, 2013, The FBI and New York City Police Department announced a $65 thousand reward “for information leading to the identification, arrest, and conviction of the suspect or suspects involved in the unsolved 2008 bombing. . .” In the early morning hours of March 8, 2008, authorities believe a bicyclist rode up to the doors of the facility and left a bomb that exploded and damaged the front entrance. (AP Photo/FBI)
Jury can't reach... Detroit police officer Joseph Weekley stands in Judge Cynthia Hathaway's courtroom at the Frank Murphy Hall of Justice in Detroit, Michigan on Tuesday, June 18, 2013 as the judge instructs jurors to continue to work toward a verdict after they sent her a note saying they are "stuck". The judge declared a mistrial Tuesday after jurors failed to reach a verdict in the trial. Weekley is charged with involuntary manslaughter in the shooting death of 7-year-old Aiyana Stanley-Jones. (AP Photo/The Detroit News, John T. Greilick) DETROIT FREE PRESS OUT; HUFFINGTON POST OUT
NSA director say... From left, Deputy Attorney General James Cole; National Security Agency (NSA) Deputy Director Chris Inglis; NSA Director Gen. Keith B. Alexander; Deputy FBI Director Sean Joyce; and Robert Litt, general counsel to the Office of the Director of National Intelligence; prepares to testify on Capitol Hill in Washington, Tuesday, June 18, 2013, before the House Intelligence Committee hearing regarding NSA surveillance. (AP Photo/Charles Dharapak)
Zimmerman trial ... George Zimmerman talks to his attorney Mark O'Mara, right, during a recess in Seminole circuit court during Zimmerman's trial in Sanford, Fla., Monday, June 17, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)
G-8 NOTEBOOK: Ca... British Prime Minister David Cameron speaks during a media conference at the G-8 summit at the Lough Erne golf resort in Enniskillen, Northern Ireland, on Tuesday, June 18, 2013. The final day of the G-8 summit of wealthy nations is ending with discussions on globe-trotting corporate tax dodgers, a lunch with leaders from Africa, and suspense over whether Russia and Western leaders can avoid diplomatic fireworks over their deadlock on Syria’s civil war. (AP Photo/Matt Cardy, Pool)
Search for Hoffa... FILE - In this Aug. 21, 1969 file photo, Teamsters Union leader James Hoffa is shown in Chattanooga, Tenn. The FBI has seen enough merit in a reputed Mafia captain's tip to once again break out the digging equipment to search for the remains of Hoffa, last seen alive before a lunch meeting with two mobsters nearly 40 years ago. Tony Zerilli told his lawyer that Hoffa was buried beneath a concrete slab in a barn in a field in suburban Detroit in 1975. (AP Photo/File)
Utah man shot in... This photo provided by the Ogden City Police shows Charles Richard Jennings Jr. Police say Jennings, 35, walked into a Father's Day Catholic Mass at Saint James the Just Catholic Church in Ogden, Utah on Sunday and shot his 65-year-old father-in-law, James Evans, in the head in front of a congregation of 300 people. Evans is expected to survive. (AP Photo/Ogden City Police Department via The Deseret News) SALT LAKE TRIBUNE OUT; MAGS OUT
Medicare: Cost-s... FILE - In this March 14, 2009 file photo, a woman gets ready to check her blood sugar in Sacramento, Calif. Medicare begins a major change next month that could save older diabetics money and time when they buy crucial supplies to test their blood sugar _ but it also may cause some patient confusion. On July 1, Medicare opens a national mail-order program for diabetes testing supplies that will drop substantially the prices the government pays for those products _ and will restrict who's allowed to sell them. The goal is to save taxpayer dollars, and seniors in the program should see their copays drop, too, from more than $15 an order to less than $5. For a chronic disease, that can add up fast. (AP Photo/Steve Yeater, File)
Civil rights gro... Supporters of a lawsuit challenging the NYPD's Muslim surveillance program, hold signs during a gathering on a plaza in front of New York City Police Department headquarters, Tuesday, June 18, 2013. In a lawsuit filed Tuesday, civil rights lawyers urged a U.S. judge to declare the NYPD's widespread spying programs directed at Muslims to be unconstitutional, order police to stop their surveillance and destroy any records in police files.(AP Photo/Richard Drew)
Reputed Mafioso ... FILE - This July 26, 1959 file photo shows Teamsters Union president Jimmy Hoffa in Washington. Federal agents revived the hunt for the remains of Hoffa on Monday, June 17, 2013, digging around in a suburban Detroit field where a reputed Mafia captain says the Teamsters boss' body was buried. Authorities used excavation equipment to root around in the Oakland Township property, about 25 miles north of Detroit. (AP Photo/File)
Chicago's next U... Blood stains and a make shift memorial for 18-year-old Jamal Jones is seen where police found him with gunshots wounds to the shoulder and chest over the past weekend, on Chicago's Southside, Monday, June 17, 2013. Chicago Police are investigating several shootings after a violent weekend that left at least seven people dead, including Jones, and more than three dozen wounded. (AP Photo/Charles Rex Arbogast)