Longitude: 46.95, Latitude: -20.45
Nepheline syenite dykes are indicated on the 1:500,000 geological map (Besairie, 1969a) as occurring at three localities in the Ambatofinandrahana igneous complex. No description of these dykes has been found.
BESAIRIE, H. 1969a. Carte Géologique. Feuille 5. Tananarive. 1:500,000. Service Géologique de Madagasikara, Tananarive.