English edit

Etymology edit

ortho- +‎ geosyncline

Noun edit

orthogeosyncline (plural orthogeosynclines)

  1. (geology) A linear geosynclinal belt lying between continental and oceanic cratons, and having internal volcanic belts (eugeosynclinal) and external nonvolcanic belts (miogeosynclinal). Also known as geosynclinal couple; primary geosyncline.