Abstract
The Jurassic System in North America varies greatly from place to place in composition, structure, and thickness. Compared with the Jurassic of Europe, it is, in spite of great thickness in a few localities, a very incomplete record. The nature of this incompleteness is of unusual interest, and has not been well understood. Part of it is connected with recognizable unconformities occurring mostly round the edges of the central belt of the Cordillera, which was a land mass in Jurassic time. It is with these unconformities that this article deals.
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