Momoyama

 

The granitic rocks around Mt. Tsukuba are divided into Tsukuba Granite and Kabasan Granite.  At this point, intrusive relationship between these can be observed.  In addition, fine-grained diorite (so-called meta-diabase) is also exposed.

 

Tsukuba Granite in left is intruded by  Kabasan Granite in right

 

Fine-grained diorite in granitic rocks.