Saturday, August 7, 2010
Geology
The USGS has a really nice collection of geology maps for google earth. According to the map, my house sits on a combination of two types of igneous rocks: Diorite and Gabbro. Wikipedia states that "Diorite is an extremely hard rock, making it difficult to carve and work with. It is so hard that ancient civilizations (such as Ancient Egypt) used diorite balls to work granite."
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The drillers said that they didn't hit much diorite. Once they made it through the 43 feet of clay, they thought it was almost all gabbro.
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