What are core
samples? | How are they
Samples from Terminal Tower
Geology is the science that deals
with the history of the earth and its life. Geologists study solid
matter and geologic features on earth (and on the moon). Sometimes
it's necessary to discover what is beneath the surface of the earth.
Instead of digging vast pieces of land, geologists use drills to
take samples to analyze the composition of the earth's interior.
Core samples are used to determine where to place a building and
how to support it, to find out if oil is part of a tract of land,
to gather weather information and much more.
of the uses of core samples include the following:
Core samples of oak trees taken in Illinois allow
scientists to look at samples to determine the amount of rainfall,
temperature, age of the tree and more.
Samples from the moon were brought to Earth and
Ocean drilling using ships to hold the drill presents
new challenges to geologists.
In planning the Terminal Tower complex, soil engineers took core
samples of the project area, the river area and the approaches to
the building area. Each sample was recorded on a map showing location.
Also shown was the subsoil condition. Basically what scientists
found was ash and sand at the top level, gravel, clay and then shale.
The shale is what the engineers were looking for. The shale was
the bedrock that would give the tower a solid foundation.
For 40 or 50 years, the samples were kept in the Tower City Archives.
Now they have been transferred to Cleveland State University. A
team of geologists headed by Dr. Michael Tevesz of Cleveland State
is now analyzing the core samples. They are separating, organizing,
labeling, collecting data and graphing the results of their findings.
It would be extremely difficult and expensive to break through concrete
and asphalt to get these samples today.
The core samples give a history of the climate and the environment.
Looking at the samples, scientists can look back in time and see
if the area was wet or dry, warm or cold. They dig into the earth
to find out what went on in the atmosphere. The sediments from the
sample are compared to others. They are full of information about
climate and environment. There is much yet to be revealed.
Coring Tool -- Different types to be used
in different types of soils.
Completion Tool -- Used to isolate multiple
zones in a borehole for independent zone investigation.
Downhole Tools -- Used to measure temperature.
Reentry Hardware -- Used to enter holes
that are already drilled.
Water Line Tools -- Specialized tools are
deployed by sandline cable to perform a wide range of tasks,
including assistance in logging, core monitoring/orientation,