21. This separates the limestone, igneous intrusions and Bowmore sandstones from the Colonsay Group rocks of the Rhinns. 22. A positive gravity anomaly may be an igneous intrusion , a negative anomaly a salt dome or void. 23. A common occurrence of granophyre is within layered igneous intrusions dominated by rocks with compositions like that of gabbro. 24. Mississippi valley type ore deposits lack silver and gold mineralization, and are not associated with nearby igneous intrusions . 25. During the Taconic orogeny, more igneous intrusions and metamorphism occurred as the ancestral Taconic Mountains were pushed up. 26. "' Doros Complex "'is a differentiated igneous intrusion in the Damaraland region of Namibia. 27. The igneous intrusion that produced these diabase dikes also replaced limestone or marble in the surrounding rock with iron ores. 28. When igneous intrusions occurred during the Karoo magmatism in the Jurassic period, they follow the directions of previous dykes. 29. Radiometric ages of igneous intrusions in Sleeping Ute Mountain are essentially identical to those of the diorite intrusions in the Carrizos. 30. From these orogeny came igneous intrusions in the Piedmont, the Blue Ridge, the Valley and Ridge and the Appalachian Plateau.
