21. The Central Anatolian Volcanic Province , of which Erciyes is a part of, covers a surface area of. 22. Exploration of the Marie Byrd Land Volcanic Province began in earnest by U . S . geologists in 1984 85. 23. The shield is associated with an extensive group of related volcanoes called the Northern Cordilleran Volcanic Province ( NCVP ). 24. Fort Selkirk Vent and the surrounding landscape lies in the Fort Selkirk Volcanic Field of the Northern Cordilleran Volcanic Province . 25. The only activity present in the Northern Cordilleran Volcanic Province has been occasional earthquakes and constant boiling of hot springs. 26. This belt of volcanoes coincides with the trend of the Balcones Fault zone and is known as the Balcones volcanic province . 27. Xenoliths, rock fragments that become enveloped in a larger igneous rock, are widespread in the Northern Cordilleran Volcanic Province . 28. The rift zone has existed for at least 14.9 million years and has created the Northern Cordilleran Volcanic Province . 29. The Northern Cordilleran Volcanic Province ( sometimes known as the Stikine Volcanic Belt ) is the most active volcanic region in Canada. 30. A range of alkaline rock types not commonly found in the Western Cordillera are regionally widespread in the Northern Cordilleran Volcanic Province .
