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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A usually elongate, basinlike depression along the edge of a continent, in which a thick sequence of sediments and volcanic deposits has accumulated.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A large, linear depression in the Earth's crust in which sediment accumulates.

from The Century Dictionary and Cyclopedia

  • n. In geology, a considerable tract in which the strata are bent into a great trough with many minor undulations on the flanks.


Back-formation from geosynclinal. (Wiktionary)


  • The park's principal geomorphic feature is the north-east to south-east geosyncline which is surrounded by raised folds and high mountains.

    Darién National Park, Panama

  • "geosyncline," a vast trough, or cradle, being slowly filled with sediment brought down by the rivers from the adjoining shores.

    Time and Change

  • This ecoregion is relatively young, perhaps less than 10,000 years old, and developed in a great geosyncline between the Guiana Plateau and the Andes Range.


  • Well, where it faltered was at the edge of a geosyncline, the orogenesis is much later than this area.

    Dinosaur Planet

  • "Evidently then," continued the professor, "the atoll is simply an annular terminal moraine of detritus shed alluvially into the sea, thus leaving a geosyncline of volcanic ash embedded with an occasional trilobite and the fragments of scoria, upon which we now stand."

    The Cruise of the Kawa

  • Now, let us suppose, in the trough of the geosyncline, and upon the top of the normal layer, a deposit of, say, 10 kilometres (6.2 miles) of sediments is formed during a long period of continental denudation.

    The Birth-Time of the World and Other Scientific Essays

  • Mesozoic times had collected in the geosyncline formed by their own ever increasing weight.

    The Birth-Time of the World and Other Scientific Essays

  • Again, the ancient and modern volcanoes and earthquakes of Europe are associated with the geosyncline of the greater Mediterranean, the

    The Birth-Time of the World and Other Scientific Essays

  • When yielding has begun in any geosyncline, and the materials are faulted and overthrust, there results a considerably increased thickness.

    The Birth-Time of the World and Other Scientific Essays

  • The mountain range can only arise where the geosyncline is deeply filled by long ages of sedimentation.

    The Birth-Time of the World and Other Scientific Essays


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