The entrance way you see here is made from Arkansas limestone in the late 19th century. Limestone is formed from the decay of marine life. When they die, they sink to the bottom. Now, all living things must have phosphorous as it makes up DNA. When the animal dies, the phosphorus decays as well and over time, forms a hard layer of rock we know as limestone. Limestone gets its distinctive color from the calcium in the rock from other parts of decaying organic mater. Over millions of years, this limestone has lifted out of the ocean from below sea level, to Arkansas at a rate of about two inches every year.
Arkansas limestone can be found in the northern part of the state. There are active queries even today, that still mine for limestone for sculptures and buildings. Below, is a map of where the Arkansas limestone can be found in the state in dark green.
Works Cited
http://www.geology.ar.gov/geology/ozark_mississippian.htm
http://geology.com/rocks/limestone.shtml
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1. Janssen Place Archway on the first line of your email.
2. Describe the texture AND color of Arkansas Limestone at this location.
3. Describe the weathering process of this rock. Is there any rusting or corrosion? If so, where do you see it and why is this occurring?
4. Notice the different colorations of the Arkansas Limestone bricks. Why do you think this happens?