Walking Downtown Building Stone Field Trip
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Free Building Stones Tour
Houston is a terrible place for a geologist because there are no outcrops, but people have been kind enough to cover their buildings with wonderful rocks. Come on a free 45 minute tour of some of the buildings near the Houston City Hall and learn about igneous, metamorphic, and sedimentary rocks.
For example: City Hall is primarily made up of a fossiliferous limestone from the Cretaceous Walnut formation and the pavement is Mississippian age Bedford Oolite with elaborate worm trails. The Library is granite from South Dakota and contains zenoliths. The nearby Dynegy is coated with the most amazing fish scale labradorite that crystallizes deep within the earth. The Shell buildings are on the other end of the geologic spectrum because they are covered with Italian tufa which crystallizes out of water from hot springs. Between the last two buildings, we are likely to encounter a really good gneiss and I will tell you how it got that name.
Building Stone Tour will meet at the HGS booth # 77. Tour leaves every two hours (10am, 12 noon, 2pm, 4pm). Please arrive at the booth a few minutes before the departure time to sign in.
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