orogenicadj.

1885 Science 6 Mar. 185/1 The increased favor with which the orogenic theory of earthquakes—the theory that regards earthquakes as the effect of disturbances due to mountain growth—has been looked upon in recent years must be accounted a distinct gain for physical geology.

1898 J. E. Marr Princ. Stratigr. Geol. 32 Inversion is a frequent accompaniment of the more local orogenic or mountain-forming movements.

1957 Sci. News 43 72 We live in an atypical age, little separated from a major orogenic episode.

1986 New Yorker 10 Mar. 82/1 There is some granite in New Hampshire that is two hundred million years old—still too young to be part of the Appalachian orogenic story.

1993 Jrnl. Petrol. 34 127 Pyroxenites from orogenic peridotite massifs may be divided into two lithological groups on the basis of their pyroxene chemistry.

1920 Sci. Monthly May 493 Most of the post-Cambrian eruptivity of the continents is concentrated in orogenic belts, leaving the larger part of the continental surfaces free from igneous rocks.

1944 A. Holmes Princ. Physical Geol. xviii. 378 It is..essential to discriminate carefully between the geographical concept of a mountain range or system and the geological concept of an orogenic belt: the one refers to the height and relief of the land; the other to the structure of the rocks, whether the region be high, low, or submerged.

1992 Sci. Amer. Apr. 37/3 The encounter between Laurentia and Baltica gave rise to the Caledonian orogenic belt, a large deformed region that marks an eroded mountain range running from Ireland to northern Scandinavia and Greenland.

1935 Geogr. Jrnl. 86 76 Neither in the orogenically nor in the isostatically affected areas.

1971 I. G. Gass et al. Understanding Earth xxii. 323/2 The ancient diamondiferous sediments of the Ivory Coast were orogenically deformed some 2000 million years ago.

2002 Geology 30 1003 The gravitational collapse of orogenically thickened crust.