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The list describes the layers encountered in their characteristic form. This includes information on appearance, texture and consistency, but also on special features such as odour, inclusions or differences in colour. Equally indispensable is the depth information, which defines the exact boundaries between the layers. This creates a continuous visualisation of the subsurface that remains comprehensible regardless of personal impressions.

There are many possible applications for the stratigraphic log. In civil engineering, it serves as a basis for assessing bearing capacity, groundwater conditions or possible subsidence. For environmental assessments, it provides information on the permeability and stratification of the soil, which can be decisive for the assessment of contaminated sites or groundwater movements. In geological research, on the other hand, it provides material for reconstructing historical deposits and developments.

A precise layer catalogue gives the drilling documentation its true significance. It provides a clear view of the subsurface, reduces uncertainties and creates confidence in further analyses. This makes it a key tool that plays a decisive role in the success of planning and projects.

Standards are essential to make a strata catalogue consistent and comparable. This includes DIN 4022,, which describes and standardises the approach to soils and rock. It is supplemented by DIN 4023, which is closely linked to the visualisation of layer sequences in the drilling profile. At international level, ISO 14688 ensures standardised classification and terminology. Together, these standards create the basis for transparent, technically correct and supra-regionally comprehensible documentation of drilling results.

The graphical representation is a vertical section through the borehole. Different soil types and rocks are identified by standardised colours, patterns or symbols. In addition, depth information is used to mark the beginning and end of a layer and establish the connection to the actual borehole. This creates a vivid image that concisely complements the text information and in many cases even makes it easier to understand.

In practice, the drilling profile offers numerous advantages. Engineers can use the sequence of layers to assess which construction methods are suitable and where special precautions are required. It also has an important function for environmental assessments, as the permeability of soil layers or the location of groundwater can be seen directly. Clients in turn receive a compact and easily comprehensible overview with the drilling profile.

In addition to its immediate practical use, the drilling profile also plays an important role in research. It provides data that can be used for geological reconstructions and comparative analyses. It thus contributes to scientific documentation and creates a solid basis for understanding long-term developments in the subsurface. Its value therefore lies equally in its technical and scientific application.

There are clear standards to ensure that drilling profiles are comprehensible and comparable everywhere. Particularly relevant are DIN 4023,, which sets out specifications for the presentation of drilling profiles, and DIN 4022,, which regulates the labelling of soil and rock materials. At international level, ISO 14688 supplements these standards by specifying standardised rules for naming and classifying soils. These standards ensure uniformity and guarantee that drilling profiles can be used across regions and disciplines.

The typical contents of a drilling log include details of the drilling equipment, the method used and the start and end times of the drilling. The depth reached, the drilling speed and special incidents such as obstacles or technical problems are also documented. In addition, information on auxiliary equipment such as flushing, pipework or accessories used is also included. This information provides a complete basis for a precise understanding of the drilling conditions at a later date.

In practice, the drilling log fulfils various tasks. On the one hand, it serves as quality assurance and can be used as legal proof if questions arise regarding proper execution. On the other hand, it provides engineers, geologists and clients with the basis for decisions on construction methods, safety measures or cost planning. Thanks to its clear structure, it also supports communication between all parties involved and thus contributes to the efficiency of a project.

The drilling log also has a firm place in scientific contexts. It provides comprehensible documentation that is indispensable for comparing different investigations. It also creates transparency, as it records not only the results but also the process by which they were obtained. In this way, it contributes to making geological data permanently usable and verifiable.

The preparation of drilling logs is regulated by standards to ensure standardisation and comparability. Of particular relevance is DIN 4021,, which contains clear specifications for the logging of boreholes. In addition, DIN 4022, is used to standardise the description of soil and rock materials. At international level, ISO 22475 is also used, which standardises geotechnical exploration, sampling and groundwater measurements. These standards ensure that drilling logs are technically robust and internationally understandable.