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A fold characterized by central orientation of the dip of the beds.
A variety of albite elongated, and often twinned, along the b-axis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



rock strata that on a horizontal cross section of the earth’s surface form arcuate bends or ovals with layers dipping radially from a center. The layers fan out toward the periphery. The beds usually occur in domes and on the margins of anticlines and brachyanticlines.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.