exposes the brown and grey igneous rock, called dolerite, which covers less than one square mile. It is one of the most distinctive minor regions within the Black Country. The dolerite can be seen as a building stone in the older cottages around Rowley Regis. The dark brown, shapeless rock was used to create walls around the windy fields on the summit of Turners Hill. The use of the Rowley dolerite (known as Rowley Rag) as a building stone ceased over two centuries ago after bricks (made from the clays within the coal measures) became the universal building material of the Black Country. The rise of the quarry industry on a commercial scale dates from the 1820s; the hard smooth rock was used for the paving stones of new streets in Birmingham and the rapidly growing Black Country towns. Today the quarries serve as a source of road metal. Quarrying in other areas of Tividale, such as Darby's Hill, Warren's Hall and Blue Rock, has ceased; and the quarries are used for landfill. Only Turner's Hill quarry remains. Housing Housing estates around Tividale include Tividale Hall, Castle View, Grace Mary and Brades Hall. Dudley Golf Course has existed at Oakham since the early 20th century, originally being split in two by the Oakham Road. In the mid 1960s, however, the section of the course on Darby's Hill was sold and part of it was used to build a private housing estate known as Oakham Green. The roads on this estate are all named after golf courses; St Andrews Drive, Muirfield Crescent, Gleneagles Drive, Hoylake Drive, Sunningdale Drive, Birkdale Drive and Wentworth Drive. Grace Mary was built in the 1930s between Oakham and the recently completed Birmingham New Road, mostly as council housing. Expansions took place in the 1950s to merge it into Tividale Hall. Tividale Hall was developed as private housing during the mid-1930s to early 1940s and the final area around Pine Road immediately after the war in the Dudley section of Tividale, but was extended in the 1950s with council housing. Most of the roads in this area are named after trees, including Elm Terrace, Birch Crescent, Pine Road and Ash Terrace. Brades Hall (not to be confused with nearby Brades Village in Oldbury) is situated in the north of Tividale off the A457 road between Tipton and Oldbury. The first development took place with private housing during