Abstract
The results of the German Continental Deep Drilling Program are not widely known, even inside the geological community, but this was a remarkable attempt to learn more about the Earth's crystalline continental crust. The project ran from 1987 to 1994, during which time a 4-km pilot hole was drilled and cored, followed by a 9.1-km main hole which passed through the top third of the crust. Downhole logging and continuing experimentation has resulted in a vast amount of data, reports of which have not circulated widely. Now, however, much of the work is summarized in a special issue of Journal of Geophysical Research — it will provide a great deal for geologists and geophysicists to ruminate on.
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