Q:

What are some examples of a stratigraphic column?

A:

Quick Answer

Stratigraphic columns are illustrations made by geologists to represent the relative composition, thickness and scope of layers of rock, such as in a canyon, a volcano or a cliff. Some drawings are black and white with labeled layers, while others have colors that more closely resemble layers of rock described in the column. Each layer is distinct, and geologists label the general composition of each portion.

Continue Reading

Full Answer

Illustrations on stratigraphic columns are standardized so geologists can read each graphic and determine the composition of each layer. Dots represent sandstone. Limestone follows a brick-like pattern. Dolomite is a brick pattern, only with slanted sides. The symbol for broccia looks like irregular spots and blotches. Siltstone looks like broken horizontal lines. Stratigraphic columns for volcanoes or magma chambers are drawn differently because lava doesn't necessarily flow vertically in the same manner as a column does.

Several bits of information are included on stratigraphic columns. The scale of layers, a map or description of the locality, the positions of rock beds, faults or cracks and the methods of measurement are just some keys to stratigraphic columns. A time frame of geologic periods is listed to the side of each illustration.

These illustrations describe any geologic formation with layers. A notable geologic formation illustrated by stratigraphic columns is the Grand Canyon in the United States.

Learn more about Geology

Related Questions

  • Q:

    What is exfoliation geology?

    A:

    Exfoliation geology is a type of rock weathering where the rock's layers peel off in whole sheets instead of grain by grain. Large-scale exfoliation occurs due to the mechanics of gravity on a curved surface, while small-scale exfoliation is due to chemical weathering.

    Full Answer >
    Filed Under:
  • Q:

    What word describes the change in rock shape due to stress?

    A:

    Folding is a ductile behavior in which flat layers of rock bend in response to stress. Faulting is a brittle behavior in which a rock develops one or more fractures in response to stress.

    Full Answer >
    Filed Under:
  • Q:

    What are gaps in rock layers called?

    A:

    According to the Institute for Creation Research, the gaps found in rock layers are known as “unconformities.” They represent erosion or a time period known as non-deposition.

    Full Answer >
    Filed Under:
  • Q:

    How is a laccolith formed?

    A:

    A laccolith is a geological structure that forms when magma pushes through layers of rock above it and pools in a dome shape. Laccoliths are characterized by their shape, as they are typically flat on the bottom and rounded or dome shaped on top. These structures are also called plutonic formations or igneous intrusions, which are related to sills.

    Full Answer >
    Filed Under:

Explore