Geological Map Of The Country Around Heidelberg – Union Of South Africa – 1922 – First Edition

Cartographer: J. W. Rogers &  L. T. Nel
Publisher: Geological Survey, Department Of Mines And Industries
Price: £95 (post-free in the UK)
Publication Date: 1922
Edition: 1st edition
Format: Colour printed
Condition: In good only condition
Sheet Size: 89.2cm x 72cm

Condition:

Size: 89.2cm x 72cm. Trimmed to the margins. Stains, chips and wear to the map with some loss to the upper margin and a closed tear to the lower margin. In good only condition but scarce.

Location: DOBRLTUBE 002816

Geological Map Of The Country Around Heidelberg: A Historical Overview

This authoritative geological map, compiled by Arthur William Rogers, represents a key contribution to the early 20th-century geological survey work undertaken in the Transvaal region of South Africa. Centred on the town of Heidelberg, located to the south-east of Johannesburg in what is today Gauteng Province, the map was part of a broader effort to systematically chart the mineral wealth and geological structure of South Africa during a period of intense industrial and scientific interest.

W. Rogers, one of the foremost figures in South African geology, served as Director of the Geological Survey of the Union of South Africa and was instrumental in producing a series of detailed regional maps, many of which became reference works for academics, engineers, and mining interests alike. His mapping of the Heidelberg district showcases his characteristic precision, scientific rigour, and clarity of presentation.

The map typically displays a diverse array of geological formations, including Pre-Cambrian basement rocks, Karoo sedimentary sequences, and younger volcanic intrusions. Special attention is paid to fault systems, mineral-bearing zones, and stratigraphic transitions — all of which are rendered in a distinctive and carefully curated colour palette.

Of particular note in the Heidelberg region is its proximity to the Witwatersrand Basin, one of the world’s richest gold-producing areas. While Heidelberg lies just beyond the central gold belt, its geological setting is crucial to understanding the broader tectonic and sedimentological evolution of the region. The map may also identify areas of coal-bearing strata and other economically significant formations, reflecting the broader industrial priorities of the period.

Accompanying explanatory notes — common in such publications — would typically include a stratigraphic column, lithological descriptions, and commentary on the structural geology, often written in a clear, didactic style aimed at both geologists and informed lay readers.

Rogers’ work remains a benchmark in the development of South African geological cartography. His Geological Map of the Country Around Heidelberg is not only a scientific document but also a historical artefact — capturing a moment in which geology, colonial administration, and resource exploration were closely entwined.

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