TS 3388

TS 3388 is a graphical symbol standard for showing sedimentary rocks on geological maps and sections. In geological drafting, symbol systems help convert field interpretation into a readable visual language, making rock type, layering, and map relationships easier to understand at a glance. This standard focuses specifically on the representation of sedimentary rocks, while lithological symbols for borehole logs are excluded from its scope.

Why sedimentary-rock symbols matter in geological drawings

Sedimentary rocks are formed by deposition and are often recognized by bedding and other layered features. In maps and cross-sections, symbolic representation helps communicate observations consistently across drawings and reports. A shared symbol language improves readability and supports faster interpretation of rock distribution, textural differences, and stratigraphic relations in technical documentation.

Technical coverage of the standard

The standard provides a set of symbols for representing sedimentary rocks on geological maps and geological cross-sections. In general technical practice, such symbol standards are used to promote consistent presentation across drawings so that the same rock unit is depicted in a comparable way from one document to another. Here, the emphasis is on graphical marks for sedimentary rocks rather than on borehole-log lithology symbols or broader geological notation systems.

• Graphical representation of sedimentary rocks on geological maps
• Graphical representation of sedimentary rocks on geological cross-sections
• Lithological symbols for borehole logs are outside the scope
• Consistent visual language for geological drafting