the team says they examed carbide on the surface. they date back between 15,000 and 12,000 years. researchers detected lipids from fish products and a scorched residue on cooking pots. they date back 14,000 years and the shell mound 12,000 years. a team says the residue from the ruins could be of spawning salmon since the site is located inland. >>> people in eastern areas of the united states are dealing with disruption in air and ground transportation. we hear why in world weather. >> that's right. hundreds of flights have been delayed or cancelled at o'hare international airport. this is due to heavy snow caused by this low pressure system. this system has a history of producing 72 centimeters in wyoming. it looks like 60 centimeters is possible in minnesota. we could be seeing white out conditions. driving is going to be extremely dangerous. if you travel bring surviving kit and food in case of emergency. we could be seeing freezing rain for areas shaded in purple which is troublesome for driving. air is coming in so due to the temperature contrast we're going to be seeing sev