TS 3389

TS 3389 is a graphical-symbol standard for showing magmatic rocks on geological maps and cross-sections. In geological drafting, the aim is to express rock type, distribution, and section interpretation in a compact and consistent visual language; this standard focuses on the symbols used to represent magmatic rock units in that context.

What the symbol set is used for

Magmatic rocks are formed by the cooling and solidification of magma, and they are commonly distinguished by texture, grain size, colour, and mode of occurrence. In maps and cross-sections, symbols condense that geological information into a form that works at drawing scale. The result is clearer unit boundaries, lithological distinctions, and sectional interpretation. The scope of TS 3389 is the symbolisation itself rather than broader geological classification or interpretation.

Why a shared graphic language matters

Geological maps and cross-sections combine field observation with subsurface interpretation, so consistency in notation is important. When the same rock type is shown with different symbols across reports, comparison becomes harder. Graphical-symbol standards support consistency across organisations and projects, helping technical drawings remain readable in field geology, mineral exploration, engineering work, and regional mapping. TS 3389 belongs to this technical framework for the visual representation of magmatic rocks.

• Prepared for graphical symbols used on geological maps and cross-sections.
• Concerns the visual representation of magmatic rocks.
• Its main purpose is consistency and readability in technical drawings.
• It is published as equivalent to ISO 710-3:1974.
• This record is for a withdrawn standard.