Report No. : GEO Report No. 371

Report Title : Updating of Hong Kong Geological Survey 1:20,000-scale Maps Major Findings and Revisions Map Sheet 2 – San Tin (2024), 40 p.

Author : T. K. Tse & D. L. K. Tang

Abstract

The 1:20,000-scale Geological Map Sheet 2 – San Tin is the fifth map updated under the map updating programme, currently being undertaken by the Hong Kong Geological Survey of the Geotechnical Engineering Office. The first edition of Sheet 2 solid and superficial geology map was surveyed between 1985 and 1987, and was published in 1989; while the solid geology map, which was based on geological data available up to 1994, was published in 1994. Reliability of the geological maps has been improved after incorporation of the vast amount of new information that has accumulated over the past thirty years, and advances in the understanding Hong Kong's geology since the published maps were first surveyed.

The key findings and revisions to Sheet 2 include: (a) revision of the nomenclature and classification of volcanic stratigraphy and intrusive rocks, (b) revision of the stratigraphy of the San Tin Group, (c) tentative assignment of a sedimentary unit to the Tai O Formation, (d) subdivision of the Tuen Mun Formation, (e) inferred presence of the Shing Mun Formation, (f) updates of the Kat O Formation and existing plutonic units, and (g) identification of an undifferentiated granite.

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