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     What this picture is depicting is Baltimore row houses and a quarry. A quarry is not a mine. It is the side of a hill or mountain. You chip away at the side of the mountain like you might a mine, you might also use dynamite.  Baltimore row houses are in it because, the steps of the original Baltimore row houses were made of Cockeysville marble. They had such a big supplies of this rock they decided to bring big blocks of this marble to the houses and use it to make steps. Read below to learn more!

Quarries in Baltimore

    One of Maryland’s biggest quarries is the Texas Quarry. The Texas Quarry is located in Timonium, Maryland in Baltimore County.  It is mile long, 1/2 mile wide, and 400 feet deep.  This quarry use to be operated by Genstar, so it was called the "Genstar Quarry."  Now the  quarry is operated by  "Lefarge North America".  Lefarge   North America is the largest construction materials supplier around!  
The Quarry contains Cockeysville Marble, which can be used to make cement when the marble is broken up in small bits.  It also makes chalk from the calcium carbonate in the marble.  
600 million years ago Maryland was underwater and forming the limestone that is now known as Cockeysville Marble. Over time heat and pressure turned the limestone into marble.   This process of change is known as metamorphism.   This marble does not allow fossilization to happen; meaning you will find no fossils in this rock.
You can find Cockeysville Marble in many different places.  The original steps of Baltimore City’s row houses, the spires of the St. Patrick’s Cathedral in New York City, the bottom third of the Washington Monument in DC, Baltimore’s City Hall, the Maryland Club and, Penn Mutual Insurance Building in Philadelphia.
    There is an urban legend about the quarry.  Legend has it that tunnels wind there way out from the quarry into the community.  Could it be true?  No.
    Hundreds of people would chip at this quarry.  What they would use for tools are They used many different tools, such as dynamite, mules and carts to slowly remove the desired marble.  This was a very dangerous process for they could have rocks fall on their head at any time.  Today the quarry only uses 51 people to work at removing this rock; per year we get about several m
  tmillionons of rocks. We today still blast the rocks with dynamite, but housing and business developing keep this form of removing the rock at strict monitoring.  An interesting fact is that the quarry ends were I-83 begins, and the highway sits upon a rock known as  "Schist” rock.  But this rock is of no interest; it is of no mining value.
    The Texas Quarry is important to Maryland, Baltimore and geology for many reasons.  Cockeysville Marble is used all over the city.  If we didn't have our own quarry, we would have to import the rocks. This could be expensive.  We should be proud that our resources can be used not only in Baltimore, but are also part of some important landmarks.

“Baltimore Online:  The Annotated Texas Quarry.”

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