MAYSVILLIAN STAGE

time division of the Ordovician period in North America (the Ordovician period began about 505,000,000 years ago and lasted about 67,000,000 years); the Maysvillian stage follows the Edenian stage and precedes the Richmondian stage. In eastern North America, Maysvillian rocks consist largely of shales and sandstones; a portion of the Martinsburg Shale and the Pulaski Sandstone are notable examples. These sediments reflect deposition during the progressive uplift of the Appalachian highlands in Ordovician time.