Union of South Africa. Department of Mines and Industries. The geology of the country South of Piet Retief.

"UNION OF SOUTH AFRICA. DEPARTMENT OF MINES AND INDUSTRIES. GEOLOGICAL SURVEY. THE GEOLOGY OF THE COUNTRY SOUTH OF PIET RETIEF. An Explanation of Sheet No. 68 (Piet Retief) by W. A. HUMPHREY, B.A., Ph.D., and L. J. KRIGE, M.A., Ph.D. Published by Authority of the Honourable the Minister of Mines and Industries; Softcovers; Collation complete - 72 pages; Very good condition, card covers a little worn, and torn by the staples. Contents clean.

An explanation of the Geological Survey map (not present).

Content:

I. AREA AND PHYSICAL FEATURES (HUMPHREY)

1. Area

2. Topography

3. Drainage

4. Mineral Springs

II. GENERAL GEOLOGY (HUMPHREY)

1. Main Features

2. Formations

III. SWAZILAND SYSTEM (KRIGE)

1. Quartzites, Mica-schists, etc.

2. Basic and Ultrabasic Schists

IV. PONGOLA SYSTEM. (KRIGE)

1. Lower Pongola Series

2. Upper Pongola Series

3. Intrusive Rocks and Quartz Veins

4. Metamorphism

5. Structure

6. Age and Correlation

V. GRANITE (HUMPHREY AND KRIGE)

VI. POST-GRANITE AND PRE-KARROO INTRUSIVE ROCKS (KRIGE)

1. Gabbro and Granophyre

2. Diabase

VII. KARROO SYSTEM (HUMPHREY)

1. Dwyka Series

2. Ecca Series

3. Beaufort Series

VIII. KARROO" DOLERITE (HUMPHREY AND KRIGE)

IX. ECONOMIC GEOLOGY (HUMPHREY AND KRIGE)

1. Gold

2. Talc

3. Asbestos

4. Mica

5. Kaolin

6. Corundum

7. Coat

8. Iron.