Underwater forest peeks through seabed
The discovery beganwith a rumor about a fishing “honey hole” somewhere off the Alabama coastwhere the red snapperwas plentiful.
By the time Ben Raines — an environmental reporter for theMobile PressRegister — heard about the location, the rumor had evolved.
Apparently, a local dive shopownertoldhim, the fish were congregating around an underwater forest peeking out of the sediment 60 feet belowthe surface.
Raines spent months persuading the man to take him to the secret location10miles offshore, an effort that paid off in 2011 as soon as Raines got his first glimpse of the forest.
“It was like entering a fairy world,” he told The Washington Post. “You get down there, and there are these cypress trees, and there are logs lying on the bottom, and you can touch them and peel the bark off.”
“It was an otherworldly experience where you knew you were in this ancient place,” he added.
How ancient exactly? That was the question Raines and researchers from Louisiana State University and the University of Southern Mississippi were determined to answer when they began dating chunks of wood at Lawrence Livermore National Laboratory using radiocarbon dating.
The expectation, researchers said, was that the trees would end up being around10,000 years old. Nobody expected to find out that the treeswere about five times that age, Kristine DeLong, a paleoclimatologist at Louisiana State University , told The Post.
Suddenly, DeLong said, researchers realized they had stumbled upon something extraordinary. The site was notmerely a forest, but a prehistoric time capsule of the coastline and its climate during a 1,000-year period, when sea levels were much lower andmuchof the continent was hidden beneath a one-mile thick sheet of ice.
In terms of the bald cypress forest’s age, experts say there is nothing else like it in theworld.
“That 10,000- to 12,000-year time frame is one that scientists do a lot of research on,” DeLong said. “But there’s just not a lot of records from 50,000 years ago because the ice sheets either covered it up or sea level has changed so dramatically that those sites are underwater now. That’s one of the reasons that we’re so excited about this site.”
The quest to reveal the forest’s scientific secrets is captured in a new documentary directed by Raines and produced by the multimedia group This is Alabama and the Alabama Coastal Foundation. Raines and his team filmed the forest during dozens of visits.
The forest, which stretches the equivalent of multiple city blocks, is located in modern-dayMobile Bay but was miles inland from the ancient shoreline. That estimate is partially based on pollen analysis and the fact that cypress trees cannot tolerate exposure to saltwater.
Researchers believe the area was a valley about 50,000 years ago that had rivers running through it, wildlife and swamps.
Scientists believe the forest may have remained hidden were it not for Hurricane Ivan, which caused billions of dollars in damage after it slammed into the AlabamaandFlorida coast in 2004. The storm produced massivewaves thatmayhave scooped out about 10 feet of sediment covering the forest.
Whenthe forestwas alive, it may have been part of a swamp in which the sediment had low levels of oxygen. Withoutoxygen, bacteria are slower to decompose organic material. If the forest was buried quickly in a flood, for example, the trees may have been preserved before they had a chance to rot.
“These trees were basically entombed or hermetically sealed,” Raines said. “They have nine feet of sediment over them, and oxygen is locked out. It’s similar to peat bogs in Ireland, where scientists have found human bodies that were preserved by the unique environmental conditions.
“This is the same phenomenon, but with trees,” he added.
When the chunks of the trees are removed from the ocean, researchers noted, ancient sap oozes from the wood.
Grant Harley, a dendrochronologist who has analyzed wood collected from the site, told AL.com that he was amazed by the quality of the samples.
In some ways, the forest helps scientists understand what they can expect as the planetwarms once again.
“It’s pretty rapid change geologically speaking,” Martin Becker, a paleontologist from New Jersey’s William PatersonUniversity who has visited the site, told AL.com, a local news site. “We’re looking at60feet of seawater where a forest used to be . . . I’m looking at a lot of development, of people’s shore homes and condominiums, etc., you know. The forest is predicting the future, and maybe a pretty unpleasant one.”