21. One of these intrusions contained the gabbro and diorite. 22. The bridge railings are topped with double sawtooth-shaped rows of gabbro . 23. Tiantai Hill is a piece of micro-gabbro rock with sheeting joints. 24. The northern parts are of the batholith are themselves intruded by Jurassic gabbros . 25. Earlier during the Sveconorwegian orogeny mafic rocks ( gabbro -diorite ) were emplaced. 26. Above the ridges are topped by hard gabbro . 27. The massif is built mostly by gabbro rocks, a hard and resistant rock. 28. Gabbro outcroppings anchor both ends of the complex.29. Rock types include picrite, peridotite, dunite, pyroxenite, gabbro and granophyre. 30. The geology consists of a dark breccia of gabbros and dolerites intruding Archaen gneiss.
