Final answer:
A section mark typically contains a concise summary of the section's content and contextual details pertinent to that section, which could be geological, grammatical, or anatomical information.
Step-by-step explanation:
A section mark typically contains two important pieces of information. The first is a summary of the content that has been covered in that particular section; it distills the information down to key points. The second piece of information is context-specific, such as the age of rocks in a geological section, the names of punctuation marks in an English section, or the orientation of planes in an anatomical section. In the case of maps and geologic cross-sections, for instance, a section mark would include details on how to interpret the specific features of the map or cross-section, such as the geological time period or the names of different strata.