Since a proximate meteorite is called Littleton, http://www.planetary.org/multimedia/space-images/mars/lebanon-meteorite-curiosity.html http://www.planetary.org

Since a proximate meteorite is called Littleton, http://www.planetary.org/multimedia/space-images/mars/lebanon-meteorite-curiosity.html http://www.planetary.org/multimedia/space-images/mars/lebano... , my guess would be that both are named after towns in Colorado.