At the light-colored extreme are rocks made up mainly of quartz and the feldspars, with about 70% silica. Such rocks are called granitic rock. Rocks which contain large amounts of the ferromagnesian dark matter and about 50% silica are said to have basaltic composition.
It became the House of Burgesses â the first legislative assembly in the American colonies. The first assembly met on July 30, 1619, in the church at Jamestown. Present were Governor Yeardley, Council, and 22 burgesses representing 11 plantations (or settlements) Burgesses were elected representatives.
After 1 â¦ 625, the House of  Burgesses managed the affairs of the colony without the Governor.  Although not entirely democratic it contributed to the development  of representative government in colonial America. When it was  temporarily dissolved in 1774, its members met in the first  revolutionary convention in Virginia. There they elected delegates  to the First Continental Congress. Some members of the House became  leaders of the Revolutionary War.