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RossA contact is a surface where one rock type meets a differing rock type.
On a geological map, this is marked as a solid black line where the contact is confirmed by surface observations and so can be plotted accurately. If the presence of the contact is certain, but its exact location is uncertain it will be marked by a dashed black line.
See the related link from the US Geological Survey.
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How are geologic units of similar ages shown on a geologic map?
Geologic units of similar ages are typically shown on a geologic map using the same color or pattern to represent them. This helps to visually differentiate between different units and understand their distribution across a region. Stratigraphic relationships and relative ages may also be indicated to show how these units are connected in terms of geologic time.
What do the black thick lines on a Geologic map mean?
The black thick lines on a Geologic map usually represent faults or boundaries between different rock units. These lines indicate where there has been movement in the Earth's crust, leading to the displacement of rocks along these features. They are important for understanding the geologic history and structure of an area.
What is a geologic cross section?
Taken along a line drawn on a map, it is a diagram of the structure and position of the rock layers present beneath the surface along this line. Geologists learn how to construct this 3rd dimensional information from a Geologic map, If you want to know how to get at an ore body hidden underground, you need a Geologist to work out where and how deep to dig. Cross sections will be needed to do this.
Where can you get a geologic map of southern Italy?
Geologic maps of southern Italy can be obtained from the Italian Geological Survey (Servizio Geologico d'Italia) or the Geological Society of Italy (Società Geologica Italiana). Some universities or research institutions may also have these maps available for reference or purchase. Online resources such as geological data portals or digital map repositories may also provide access to geologic maps of southern Italy.
When preparing a geologic map of an unfamiliar area which type of unconformity wuld be the most difficult to recognize?
disconformity
