A large-scale depression in the earth’s crust containing very thick deposits.
- For several generations of geologists the name of J. D. Dana was associated with the concept of the geosyncline, an elongated downwarp in the Earth's crust in which a great volume of sediments accumulated.
- They are not found from Franklinian, Andean, Italian, and Tasmanian geosynclines and their adjacent shelves.
- All of these perrinitid-bearing ammonoid faunas are distributed along the active linear geosynclines and their adjacent areas, i.e., the ‘Open-Sea’ within basin and out shelf.
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