FAIRBANKS -- An Alaska river guide and former National Parks Service ranger has pleaded guilty to helping a client smuggle a 10,000-year-old mammoth fossil out of Alaska.

Karen Jettmar is author of "The Alaska River Guide" and the director of Equinox Wilderness Expeditions. The Fairbanks Daily News-Miner reports that she pleaded guilty on Friday to theft of government property, a misdemeanor.

Jettmar had been accused of two felonies and faced a trial in Fairbanks. Under the terms of a plea agreement, she must pay a fine of $30,000 and is on probation for three years.

She also must add an explicit warning to the website of her business, Equinox Wilderness Expeditions, saying it is illegal to gather fossils or archeological objects on federal lands.