Table Of Geological Formations And Colour Chart – Union Of South Africa Department Of Mines And Industries – Geological Survey

Cartographer: S. H. Haughton
Publisher: Union Of South Africa Department Of Mines And Industries – Geological Survey
Price: £125 (post-free in the UK)
Publication Date: 1936
Edition: 1st edition thus
Format: Colour printed
Condition: In very good condition
Sheet Size: 81.5cm x 50cm

Condition:

Sheet Size: 81.5cm x 50cm. Small Institutional stamp to upper margin. Minor short closed tear. Creased, marked, dusty and rubbed but this is mainly confined to the margins. Colouration very bright and clean. A very good copy. Very scarce.

Location: Pocket RSAGEOL: SR: 002850

Geological Mapping: An Historical Overview

Introduction

Geological mapping is the process of systematically documenting the distribution, nature, and relationships of rock units and geological structures at the Earth’s surface. It underpins the study and management of natural resources, environmental planning, engineering, and scientific research. The practice has evolved over centuries from rudimentary sketches to highly sophisticated digital models, combining observation, measurement, and interpretation.

Origins in Antiquity and Early Observations

Although formal geological maps are a product of modern science, the roots of geological thinking stretch back to ancient civilisations. Philosophers in classical Greece, India, and China made early attempts to explain natural phenomena such as earthquakes, fossils, and mountain formation.

Early mining cultures—such as those in ancient Egypt, Mesopotamia, and pre-Columbian South America—had practical knowledge of rock types and mineral deposits, although these understandings were not recorded as maps in the modern sense.

In medieval Europe and the Islamic world, proto-geological ideas were embedded in cosmology, natural philosophy, and mining handbooks, but lacked systematic field observation or cartographic expression.

18th Century: The Emergence of Geological Science

The 18th century marked a turning point with the rise of empirical observation and the systematisation of natural history. Naturalists and mining engineers began to record strata and mineral occurrences, often in the context of coal mining or road and canal construction.

Among the earliest known examples of geological mapping were:

• Sketches of rock layers and mining seams in central Europe
• Cross-sections used in hydrological and civil engineering projects
• Descriptive diagrams in the service of natural theology, as scholars attempted to reconcile Earth’s structure with biblical chronologies

The concept of stratigraphy—the study of layered rock formations—emerged during this period, enabling naturalists to infer relative ages and depositional environments.

19th Century: The Golden Age of Geological Mapping

The 19th century is widely regarded as the golden age of geological mapping, driven by industrial expansion, mining, and the development of modern scientific institutions. Key developments during this era included:

William Smith and the Birth of Stratigraphic Mapping

In 1815, William Smith, a canal surveyor from England, produced the first nationwide geological map: “A Delineation of the Strata of England and Wales with Part of Scotland.” His pioneering use of fossils as stratigraphic markers allowed him to correlate rock layers across wide distances, laying the foundation for modern biostratigraphy.

Smith’s map was both scientifically groundbreaking and a practical tool for resource management. Despite limited formal education, his field-based methodology revolutionised geological thinking and inspired similar efforts across Europe.

Institutional and National Mapping Projects

Governments and scientific societies began to invest in systematic national surveys. Notable examples include:

• The establishment of the Geological Survey of Great Britain (1835)
• The Geological Survey of France, Prussia, and later, the United States Geological Survey (USGS)
• Extensive fieldwork in colonial territories, driven by interest in gold, diamonds, coal, and agricultural suitability

Geological maps became essential tools for railway construction, tunnel engineering, and military planning, as well as for the development of coalfields and metal mining operations.

20th Century: Scientific Consolidation and Technological Innovation

The 20th century saw a consolidation of geological mapping techniques, accompanied by new theoretical frameworks and technological advancements.

Advances in Structural Geology and Plate Tectonics

The integration of tectonic theory, especially following the mid-century acceptance of plate tectonics, transformed geological interpretation. Maps now reflected:

• Fault systems, fold belts, and tectonic boundaries
• Orogenic events, such as mountain-building processes
• Subsurface structures inferred from seismic and borehole data

This deeper understanding allowed geologists to construct cross-sections and 3D models, enhancing the predictive power of maps.

Aerial Photography and Remote Sensing

From the 1930s onwards, aerial photography became a vital mapping tool, especially in remote and inaccessible regions. Later, satellite imagery, multispectral sensors, and geophysical surveys enabled large-scale mapping of terrain, mineral deposits, and subsurface features.

Standardisation and Thematic Mapping

International bodies, such as the International Union of Geological Sciences (IUGS), promoted standardised mapping conventions. Geological maps were published at consistent scales (e.g., 1:50,000 or 1:250,000) and began to include themes such as:

• Hydrogeology
• Engineering geology
• Geohazards (earthquakes, landslides)
• Mineral resources and environmental geology

21st Century: Digital Mapping and Global Integration

The digital revolution has transformed geological mapping in the 21st century. Modern mapping relies on Geographic Information Systems (GIS), digital field devices, and remote data access, allowing geologists to:

• Collect, analyse, and visualise data in real time
• Overlay geological information with demographic, hydrological, and climate datasets
• Share maps across institutions, borders, and disciplines

Projects such as OneGeology aim to create a seamless global geological map, with data contributions from national surveys worldwide. 3D and 4D modelling (incorporating time-based changes) now support urban planning, mineral exploration, and climate resilience strategies.

Mapping has also become increasingly collaborative, involving not only scientists but also indigenous communities, engineers, environmentalists, and policy-makers.

Applications and Continuing Relevance

Geological mapping remains foundational to:

• Natural resource management (minerals, groundwater, fossil fuels)
• Infrastructure development (roads, dams, tunnels)
• Disaster risk reduction (earthquakes, landslides, volcanic hazards)
• Environmental conservation and rehabilitation
• Scientific education and public engagement

Whether guiding a mining operation, planning a city, or understanding Earth’s deep history, geological maps serve as vital records of both natural processes and human decisions.

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